{"title":"Yanmar 56HP 4-Stroke Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;\"\u003e\n  \u003cp\u003eThis page is tailored for Yanmar 56HP 4‑Stroke marine engines. Use it to find compatible parts and practical service information, including maintenance tips, commonly replaced components, and troubleshooting guidance. You can also browse our main Yanmar collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember that on the collection page you can use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar\" style=\"display:inline-block;margin-top:8px;padding:10px 14px;background:#0ea5e9;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All Yanmar Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"margin-top:28px;max-width:1100px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 56HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate location: Look for the metal engine identification plate on the valve cover, engine block side, or timing cover. It lists the model, serial number, and emission family where applicable.\u003c\/li\u003e\n    \u003cli\u003eReading model codes: Yanmar 4‑cylinder models in this power range commonly carry 4JH designations with suffixes (e.g., E, TE, 5E, 45, 57). Suffixes often indicate aspiration, control type, or generation.\u003c\/li\u003e\n    \u003cli\u003eMechanical vs. common‑rail: Earlier 4JH variants are mechanically injected; later versions (e.g., 4JH45\/57) are electronic common‑rail. Filters, sensors, and some gaskets differ between these platforms.\u003c\/li\u003e\n    \u003cli\u003eDrive type cues: If your boat has a saildrive, note the saildrive model or tag as gear‑case anodes and seals differ from straight shaft inboards.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"margin-top:28px;max-width:1100px;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eYanmar 4JH Mechanical (E\/TE\/5E) – ~55–60 HP Class\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInline‑4, 4‑stroke diesel, mechanical injection; raw‑water cooled heat‑exchanger system\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eExamples include 4JH2E\/TE, 4JH3E, and 4JH5E variants in the mid‑50 HP range\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eRobust, proven design; straightforward service; widely supported consumables\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eFilters, belts, and exhaust elbows are generation‑specific. Confirm the exact model and serial when ordering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eYanmar 4JH Common‑Rail (e.g., 4JH45, 4JH57)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInline‑4, 4‑stroke diesel with electronic common‑rail injection and ECU controls\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e4JH45 and 4JH57 power ratings commonly found around the mid‑50 HP class\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eImproved fuel efficiency, cleaner emissions, refined idle and throttle response\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eFuel filtration, sensors, and some gaskets differ from mechanical versions. Verify serial range and emissions family.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"margin-top:28px;max-width:1100px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines—always follow the official Yanmar service manual and your boat builder’s recommendations.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eEngine oil \u0026amp; filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eUse marine‑rated diesel oil; replace filter with each oil change\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-oil-filters\"\u003eYanmar Oil filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eFuel filter(s)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInspect every 50 hrs; replace 200 hrs or sooner with contamination\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eReplace both primary (water separator) and engine‑mounted element as specified\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-fuel-filters\"\u003eYanmar Fuel filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eAir filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInspect 50–100 hrs; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eKeep intake restriction low for best economy and power\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-air-filters\"\u003eYanmar Air filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eRaw water pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eEvery 100–200 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eReplace more frequently in sandy\/silty water or if stream weakens\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\"\u003eWater pumps\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eAnodes (engine\/drive)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInspect every 50 hrs; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eMatch anode material to water type (zinc, aluminum, or magnesium)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eExhaust mixing elbow\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInspect 250–500 hrs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eLook for corrosion, internal scaling, or leakage that can cause overheating or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-elbows\"\u003eYanmar Elbows\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eSaildrive gear oil (if equipped)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eCheck for milky oil (water ingress); replace seals if contamination persists\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar\"\u003eYanmar\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"margin-top:28px;max-width:1100px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service – \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-service-maintenance-kits\"\u003eYanmar Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\"\u003eWater pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-fuel-filters\"\u003eYanmar Fuel filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFiltration (Oil) – \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-oil-filters\"\u003eYanmar Oil filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFiltration (Air) – \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-air-filters\"\u003eYanmar Air filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eExhaust \/ Mixing Elbows – \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar-elbows\"\u003eYanmar Elbows\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eStarters \u0026amp; Charging – \u003ca href=\"https:\/\/seasierra.com\/collections\/starters\"\u003eStarters\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/alternators\"\u003eAlternators\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"margin-top:28px;max-width:1100px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;padding:8px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eWeak water stream \/ overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eInspect raw water strainer, impeller condition, intake screen, and thermostat\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eWater pump impeller kit, thermostat, intake screen, gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eCheck fuel filters for restriction, air leaks on suction side, and exhaust mixing elbow for blockage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eFuel filters, fuel hoses\/clamps, exhaust elbow, boost\/charge‑air hoses (if equipped)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eVerify battery state, preheat\/glow system operation, and look for air in fuel\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eStarter, alternator\/charging components, glow plugs and relay, fuel filter and bleed fittings\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eExcessive smoke (black\/white)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eBlack: over‑fueling\/air restriction; White: cold cylinders or injector\/fuel quality issue\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f3f4f6;\"\u003eAir filter, fuel filters, injectors, heater\/plugs, intake and exhaust components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eMilky saildrive oil \/ gear noise (if equipped)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eInspect prop shaft seals and vent\/fill seals; pressure test if water ingress suspected\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eSeals, anodes, gear oil, prop hardware\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"margin-top:28px;max-width:1100px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between mechanical 4JH and common‑rail 4JH models?\u003c\/summary\u003e\n    \u003cp\u003eMany service items look similar but differ in size or specification. Fuel filters, sensors, and some gaskets are platform‑ and serial‑specific. Always confirm the exact model and serial number before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the raw water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eInspect at least annually and replace every 100–200 hours or sooner if the tell‑tale stream weakens, you operate in sandy\/silty water, or the impeller shows cracking or set.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should gear oil be changed for a saildrive?\u003c\/summary\u003e\n    \u003cp\u003eAs a general guideline, change saildrive gear oil every 100 hours or annually. If the oil appears milky, address seal issues before returning the vessel to service.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the engine model, complete serial number, any suffixes (e.g., E\/TE\/5E or 45\/57), and the drive type (saildrive or shaft). Photos of the nameplate and the existing part help ensure a correct match.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"margin-top:28px;padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;\"\u003e\n  \u003cp\u003eReady to find parts fast? Browse the main Yanmar collection and filter by horsepower, model family, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/yanmar\" style=\"display:inline-block;margin-top:8px;padding:10px 14px;background:#0ea5e9;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop Yanmar Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:10px;color:#6b7280;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"exhaust-gasket-fits-yanmar-3jh-4jh-series-marine-engines-replaces-129472-18090","title":"Exhaust Gasket – Fits Yanmar 3JH \u0026 4JH Series Marine Engines (Replaces 129472-18090)","description":"\u003csection\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis high-temperature resistant \u003cstrong\u003eExhaust Gasket\u003c\/strong\u003e is designed for Yanmar 3JH and 4JH series marine diesel engines (1990–present), creating a reliable seal between the exhaust manifold and the mixing elbow or turbocharger.\u003c\/p\u003e\n\u003cp\u003eIt is an aftermarket part that directly replaces Yanmar part numbers 129472-18090 and 12947218090.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCreates a durable seal between the exhaust manifold and the mixing elbow or turbocharger.\u003c\/li\u003e\n\u003cli\u003eMade from a high-temperature resistant composite material for longevity in harsh marine environments.\u003c\/li\u003e\n\u003cli\u003eEngineered for 4-stroke diesel Yanmar engines ranging from 20 to 125 HP.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYanmar\u003c\/td\u003e\n        \u003ctd\u003e129472-18090\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYanmar\u003c\/td\u003e\n        \u003ctd\u003e12947218090\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2-TE\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2BE\u003c\/td\u003e\n\u003ctd\u003e38\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2TBE\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH3\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH3E\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH3Z\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH3Z2\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH4E\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH5E\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH30A\u003c\/td\u003e\n\u003ctd\u003e29\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003eKeel cooler spec\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2-DTE\u003c\/td\u003e\n\u003ctd\u003e76\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2-TE\u003c\/td\u003e\n\u003ctd\u003e68\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2-E\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2-CE\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2-DTZ\u003c\/td\u003e\n\u003ctd\u003e76\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JHE\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TZ\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-HTZ\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-HTBE\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TE\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TZA\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TZAY\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TZ1\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TZ2\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1990s–2000s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-DTE\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-DTZ\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-DTZA\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-DTZAY\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-HTE\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-TE\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3E\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4-DTE\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4AE\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4E\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–2010s\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH45\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH57\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003eL \u0026amp; U type mixing elbow\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH5E\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH80\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2010s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JHZ\u003c\/td\u003e\n\u003ctd\u003e80–125\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e2000s–Present\u003c\/td\u003e\n\u003ctd\u003e129472-18090\u003c\/td\u003e\n\u003ctd\u003eVarious configurations\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eExhaust Manifold Gasket\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eManifold to Elbow\/Turbo connection\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eHigh-temperature resistant composite\u003c\/dd\u003e\n  \u003cdt\u003eDimensions (approx.)\u003c\/dt\u003e\n\u003cdd\u003e0.1 in H x 8.5 in W x 7.5 in L\u003c\/dd\u003e\n  \u003cdt\u003eWeight (approx.)\u003c\/dt\u003e\n\u003cdd\u003e28g (0.0625 lbs)\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Fuel\u003c\/dt\u003e\n\u003cdd\u003eDiesel\u003c\/dd\u003e\n  \u003cdt\u003eCondition\u003c\/dt\u003e\n\u003cdd\u003eNew\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Exhaust Manifold to Elbow\/Turbo Gasket (Replaces 129472-18090)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the engine is completely cool and disconnect the battery before starting work.\u003c\/li\u003e\n  \u003cli\u003eCarefully detach the mixing elbow or turbocharger from the exhaust manifold.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean both mating surfaces, removing all residue from the old gasket. A clean, smooth surface is essential for a proper seal.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket, ensuring all bolt holes are correctly aligned.\u003c\/li\u003e\n  \u003cli\u003eRe-attach the mixing elbow or turbo, tightening the fasteners to the manufacturer’s recommended torque specifications.\u003c\/li\u003e\n  \u003cli\u003eAfter reconnecting the battery, run the engine and carefully inspect for any exhaust leaks around the new gasket.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this gasket fits my Yanmar engine?\u003c\/summary\u003e\u003cp\u003eThis gasket is specifically made for Yanmar 3JH and 4JH series engines. To guarantee fitment, please find your exact engine model in the compatibility table on this page and confirm it uses OEM part number 129472-18090.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing exhaust gasket?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include a louder engine sound, visible black soot or exhaust residue around the manifold-to-elbow connection, a smell of exhaust fumes in the engine bay, or a potential loss of engine performance.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhen should this gasket be replaced?\u003c\/summary\u003e\u003cp\u003eIt is best practice to replace this gasket any time you remove the exhaust mixing elbow or turbocharger for service. You should also replace it immediately if you detect any signs of leakage.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDo I need to use sealant with this gasket?\u003c\/summary\u003e\u003cp\u003eNo, this gasket is designed to be installed on a clean, dry surface. Using sealant can interfere with its ability to seal correctly. Ensure both mating surfaces are free of old gasket material, rust, and debris.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards:\u003c\/strong\u003e We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment:\u003c\/strong\u003e Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value:\u003c\/strong\u003e Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50626124284219,"sku":"129472-18090","price":18.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/129472-18090_17fb1e32-79ec-4707-9033-fadfa52b29c4.jpg?v=1759816346"},{"product_id":"impeller-pump-cover-o-ring-fits-yanmar-3jh-4jh-6lp-series-engines-replaces-119773-42570","title":"Impeller Pump Cover O-Ring – Fits Yanmar 3JH\/4JH\/6LP Series Engines (Replaces 119773-42570)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis aftermarket \u003cstrong\u003eImpeller Pump Cover O-Ring\u003c\/strong\u003e is designed to fit a wide range of Yanmar 3JH, 4JH, and 6LP series diesel marine engines, from 39 to 315 HP, manufactured between 1990 and the present day. It ensures a proper seal for the sea water pump cover, preventing leaks and maintaining cooling system efficiency.\u003c\/p\u003e\n  \u003cp\u003eThis part is a direct replacement for Yanmar part numbers 119773-42570 and its superseded predecessor, X0506590-01.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngineered for manual installation in the sea water pump cover.\u003c\/li\u003e\n    \u003cli\u003eDesigned to be used with Impeller Pump Cover 129670-42520.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003ePart Number\u003c\/th\u003e\n          \u003cth\u003eSuperseded By\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eYanmar\u003c\/td\u003e\n          \u003ctd\u003eX0506590-01\u003c\/td\u003e\n          \u003ctd\u003e119773-42570\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n  \u003cp\u003eFor Yanmar Marine Engines, please ensure your model is listed. This part is critical for maintaining the integrity of the raw water cooling circuit.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Compatible Yanmar Engine Models\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eModel\u003c\/th\u003e\n          \u003cth\u003eRated HP\u003c\/th\u003e\n          \u003cth\u003eStroke\u003c\/th\u003e\n          \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH3E\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH4E\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH5E\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH40-CR\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3E EU\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3TE\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3HTE\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3DTE\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4E\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4AE\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4TE\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4HTE\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH5E\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH45-CR\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH57-CR\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH80-CR\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH110-CR\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LP-DTE\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LP-STE\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LPA-DTE\u003c\/td\u003e\n\u003ctd\u003e250\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LPA-DTP\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LPA-STE\u003c\/td\u003e\n\u003ctd\u003e300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LPA-STP\u003c\/td\u003e\n\u003ctd\u003e315\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e6LPA-STP2\u003c\/td\u003e\n\u003ctd\u003e315\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e119773-42570\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003ePump Cover O-Ring\u003c\/dd\u003e\n    \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eManual installation in sea water pump cover\u003c\/dd\u003e\n    \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eRubber\/Elastomer\u003c\/dd\u003e\n    \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n    \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e6.5\" L x 6.5\" W x 0.1\" H\u003c\/dd\u003e\n    \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eO-Ring\u003c\/dd\u003e\n    \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eUsed with Impeller Pump Cover 129670-42520\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e1 x O-Ring (119773-42570\/X0506590-01)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eTurn off the engine and close the raw water intake seacock.\u003c\/li\u003e\n    \u003cli\u003eLoosen and remove the screws or bolts securing the sea water pump cover plate.\u003c\/li\u003e\n    \u003cli\u003eCarefully pry off the cover plate. The old o-ring should be seated in a groove on the plate or the pump housing.\u003c\/li\u003e\n    \u003cli\u003eRemove the old o-ring and thoroughly clean the groove and mating surfaces, ensuring they are free of salt, debris, and corrosion.\u003c\/li\u003e\n    \u003cli\u003eSeat the new o-ring into the groove. A light application of silicone grease can help hold it in place.\u003c\/li\u003e\n    \u003cli\u003eReinstall the pump cover, making sure it is aligned correctly.\u003c\/li\u003e\n    \u003cli\u003eTighten the cover screws in a crisscross pattern to apply even pressure. Do not overtighten.\u003c\/li\u003e\n    \u003cli\u003eOpen the seacock, start the engine, and immediately check the pump cover for any signs of water leakage.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if this o-ring will fit my engine?\u003c\/summary\u003e\n    \u003cp\u003eThis o-ring is specifically designed for Yanmar 3JH, 4JH, and 6LP series engines. To ensure a perfect match, please compare your engine model and year to the detailed compatibility table on this page. Verifying the part number 119773-42570 against your service manual is also recommended.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are the signs of a failing pump cover o-ring?\u003c\/summary\u003e\n    \u003cp\u003eThe most common sign of a worn or damaged o-ring is a water leak or steady drip from the seam of the sea water pump cover, which may be more noticeable when the engine is running. A compromised seal can lead to cooling inefficiency and potential water damage to surrounding components.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should this o-ring be replaced?\u003c\/summary\u003e\n    \u003cp\u003eIt is standard practice to replace the pump cover o-ring whenever you replace the flexible impeller. This preventative maintenance ensures a reliable, leak-free seal and is a low-cost way to protect your engine's cooling system.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs any sealant required during installation?\u003c\/summary\u003e\n    \u003cp\u003eNo, this o-ring is designed to create a seal on its own. The use of additional liquid sealant is not recommended as it can interfere with the seal or contaminate the cooling system. Ensure the mating surfaces are clean, dry, and smooth before installation.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n    \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n    \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50626124841275,"sku":"119773-42570","price":9.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/119773-42570_3ecb4afd-4d15-474f-99fd-5b659b6f2337.jpg?v=1759816370"},{"product_id":"thermostat-cover-gasket-fits-yanmar-3jh-4jh-series-replaces-129795-49551","title":"Thermostat Cover Gasket – Fits Yanmar 3JH \u0026 4JH Series (Replaces 129795-49551)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eThermostat Cover Gasket – Fits Yanmar 3JH \u0026amp; 4JH Series (Replaces 129795-49551)\u003c\/strong\u003e is engineered to create a reliable seal for the thermostat housing on a wide range of Yanmar marine and industrial diesel engines. It is compatible with 3JH and 4JH series engines, including popular models like the 3JH2, 3JH5E, 4JH, and 4JH4-HTE, covering a power range from 20 to 110 HP.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Yanmar OEM part numbers 129795-49551 and its superseded predecessor, 129470-49550.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsures a direct-fit installation for proper sealing.\u003c\/li\u003e\n  \u003cli\u003eConstructed from high-temperature resistant gasket material for durability in marine diesel environments.\u003c\/li\u003e\n  \u003cli\u003eMaintains proper sealing of the thermostat housing to prevent coolant leaks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYanmar\u003c\/td\u003e\n        \u003ctd\u003e129795-49551\u003c\/td\u003e\n        \u003ctd\u003eCurrent OEM Part Number\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYanmar\u003c\/td\u003e\n        \u003ctd\u003e129470-49550\u003c\/td\u003e\n        \u003ctd\u003eSuperseded by 129795-49551\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis part is known to fit a variety of Yanmar marine and industrial engines. Please check your specific model against the list below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Yanmar Marine Engine Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2\u003c\/td\u003e\n\u003ctd\u003e38.7\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2(B)E\u003c\/td\u003e\n\u003ctd\u003e38.7\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH2T(B)E\u003c\/td\u003e\n\u003ctd\u003e47.6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH25A\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH30A\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH3E\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH4E\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH5E\u003c\/td\u003e\n\u003ctd\u003e39\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3JH40-CR\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-TE\u003c\/td\u003e\n\u003ctd\u003e55\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-HTE\u003c\/td\u003e\n\u003ctd\u003e66\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH-DTE\u003c\/td\u003e\n\u003ctd\u003e77\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2(B)E\u003c\/td\u003e\n\u003ctd\u003e51\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2T(B)E\u003c\/td\u003e\n\u003ctd\u003e63.2\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2HT(B)E\u003c\/td\u003e\n\u003ctd\u003e76.1\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2DT(B)E\u003c\/td\u003e\n\u003ctd\u003e88.4\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH2UT(B)E\u003c\/td\u003e\n\u003ctd\u003e100.6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3E EU\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-TE\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-HTE\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH3-DTE\u003c\/td\u003e\n\u003ctd\u003e125\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4E\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4AE\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4-TE\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH4-HTE\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH5E\u003c\/td\u003e\n\u003ctd\u003e54\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH45-CR\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH57-CR\u003c\/td\u003e\n\u003ctd\u003e57\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH80-CR\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4JH110-CR\u003c\/td\u003e\n\u003ctd\u003e110\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3TNE84\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNE84\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNE88\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3TNE88\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e3TNV88-DMP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNE84T\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDHQ\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDHQ(T)\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDSA\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDSA(T)\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDSAC\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDSA2\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDSA2T\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDWI\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BDYE\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BNYE883\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BNYE883T\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-BPHB\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-GNP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e4TNV88-XMS\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e129795-49551\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat Cover Gasket\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect fit\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eDiesel\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eHigh-temperature resistant gasket material\u003c\/dd\u003e\n  \u003cdt\u003eFunction\u003c\/dt\u003e\n\u003cdd\u003eMaintains proper sealing of thermostat housing\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.1 kg (0.22 lb)\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e10.0 cm L x 7.0 cm W x 0.1 cm H\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Thermostat Cover Gasket (129795-49551)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the engine is completely cool and disconnect the battery.\u003c\/li\u003e\n  \u003cli\u003eDrain the engine coolant to a level below the thermostat housing.\u003c\/li\u003e\n  \u003cli\u003eCarefully remove the bolts securing the thermostat cover. Note their positions if they are different lengths.\u003c\/li\u003e\n  \u003cli\u003eRemove the old gasket and thermostat. Clean both the housing and cover surfaces meticulously, removing all old gasket material and corrosion.\u003c\/li\u003e\n  \u003cli\u003ePlace the new gasket onto the housing, ensuring it aligns with the bolt holes.\u003c\/li\u003e\n  \u003cli\u003eRe-install the thermostat cover and tighten the bolts in a crisscross pattern to the manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the appropriate coolant.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and carefully check for any leaks around the housing as the engine warms up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my thermostat gasket is failing?\u003c\/summary\u003e\n  \u003cp\u003eSigns of a failing gasket include visible coolant leaks around the thermostat housing, engine overheating, or an unusually low coolant level. Look for crystallized coolant residue (typically green, pink, or orange) near the housing seam.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this gasket compatible with both raw water and freshwater cooled engines?\u003c\/summary\u003e\n  \u003cp\u003eYes, this gasket is made from high-temperature material suitable for both raw water (sea water) and freshwater\/coolant-based systems found in the compatible Yanmar engine series.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the recommended replacement interval?\u003c\/summary\u003e\n  \u003cp\u003eIt is best practice to replace the thermostat cover gasket whenever the thermostat is replaced or the housing is removed for service. There is no fixed interval, but it should be inspected for leaks during routine engine checks.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n    \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n    \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n    \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n    \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n    \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n    \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50626126807355,"sku":"129795-49551","price":10.8,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/129795-49551_43d1b5d0-a1fe-4d55-92f6-cecc7f11682c.jpg?v=1759816443"}],"url":"https:\/\/seasierra.com\/collections\/yanmar-56hp-4-stroke-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}