{"title":"OMC 4-Stroke 135-150HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e5e5;border-radius:8px;max-width:1100px;\"\u003e\n  \u003cp\u003eThis page is tailored for OMC 4‑Stroke 135–150HP outboard engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main OMC collection for a wider range of components. Scroll to the bottom of this page to start browsing parts for this engine. On the collection page, use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #0b5; border-radius:6px; text-decoration:none; background:#0b5; color:#fff;\"\u003eBrowse All OMC Parts\u003c\/a\u003e\n  \u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 135–150HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate\/serial plate: Typically on the transom mounting bracket or swivel bracket. It lists model number, serial number, and sometimes shaft length.\u003c\/li\u003e\n    \u003cli\u003eReading the model code: Suffixes commonly indicate shaft length (e.g., S\/L\/XL), steering\/control type, and model year. Record the full code and serial to verify parts.\u003c\/li\u003e\n    \u003cli\u003e4‑Stroke identifiers: Oil fill cap and engine oil dipstick on the powerhead; coil‑on‑plug or plug leads for 4 cylinders are common in this class.\u003c\/li\u003e\n    \u003cli\u003ePlatform clues: 135–150HP OMC\/Johnson 4‑strokes are often inline‑4 EFI engines; cowl decals and emission labels may reference EFI and displacement.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eEngine\/Platform Overview\u003c\/h2\u003e\n  \u003ch3\u003eInline‑4 EFI 4‑Stroke (Typical 135–150HP 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 #ddd;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;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 #f0f0f0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eInline‑4, electronic fuel injection (EFI), 4‑stroke with pressurized lubrication\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eOMC\/Johnson 135HP and 150HP 4‑stroke model families (various shaft lengths and control types)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eGood fuel economy, clean running, strong mid‑range torque, broad parts availability\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eMatch parts by full model and serial to account for year updates, shaft length, and gearcase variants.\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=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for typical 4‑stroke outboard use. Always confirm exact procedures and intervals with your engine’s official service manual.\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 #ddd;padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;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 #f0f0f0;\"\u003eEngine oil \u0026amp; filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eWarm engine before draining; replace crush washer if applicable\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\"\u003eOil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eInspect for metal or water intrusion; replace drain screw gaskets\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\"\u003eJohnson\/Evinrude\/OMC Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e100 hours or annually (inspect at 50 hours)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eGap to spec; replace if fouled, worn, or heat range incorrect\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eDrain any water; replace if debris or varnish is present\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eWater pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eEvery 2–3 seasons (inspect annually)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eReplace sooner if weak tell‑tale or overheat alarms occur\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-water-pump-repair-kits\"\u003eJohnson\/Evinrude\/OMC Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eAnodes (zincs)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eInspect 50 hours; replace when 50% eroded\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eChoose alloy for your water type (salt, brackish, fresh)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eJohnson\/Evinrude\/OMC Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eAnnual service kit (convenience)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eOnce per season\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eBundles common service items to save time and ensure coverage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-service-maintenance-kits\"\u003eJohnson\/Evinrude\/OMC Service \u0026amp; Maintenance Kits\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=\"padding:16px;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\/bombardier-service-maintenance-kits\"\u003eJohnson\/Evinrude\/OMC Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System: \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-water-pump-repair-kits\"\u003eJohnson\/Evinrude\/OMC Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eLower Unit Seals: \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\"\u003eJohnson\/Evinrude\/OMC Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion: \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-propellers\"\u003eJohnson\/Evinrude\/OMC Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection: \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eJohnson\/Evinrude\/OMC Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System: \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition\/Electrical: \u003ca href=\"https:\/\/seasierra.com\/collections\/starters\"\u003eStarters\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px;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 #ddd;padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;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 #f0f0f0;\"\u003eWeak tell‑tale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eInspect intake screens for debris; verify impeller condition; confirm thermostat operation\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eWater pump kit, thermostat, intake screen, gasket set\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eCheck prop for damage\/slip; inspect fuel filter; verify clean plugs; confirm throttle opening\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003ePropeller, fuel filter, spark plugs, injectors (EFI)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eConfirm battery voltage; prime fuel system; check for vacuum leaks and fouled plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eSpark plugs, fuel filter, starter, hoses\/clamps\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eVerify correct oil level; look for water intrusion; inspect prop shaft seals\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eLower unit seal kit, bearings, drain screw gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eCharging system warning\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eTest battery\/grounds; check regulator‑rectifier output; inspect connectors for corrosion\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #f0f0f0;\"\u003eRectifier\/regulator, stator, wiring\/connectors\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=\"padding:16px;max-width:1100px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome items are shared across model years, but many components vary by year, shaft length, gearcase, and EFI calibration. Always match by full model and serial to ensure correct fit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a preventive measure, replace the impeller every 2–3 seasons (or sooner if cooling performance weakens or the engine overheats). High‑silt or sandy use may require more frequent service.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eChange lower unit gear oil every 100 hours or annually. If you see milky fluid, metal particles, or burnt odor, service immediately and inspect seals and bearings.\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 complete model number, serial number, shaft length, and any known year range. Photos of the nameplate and the part being replaced help confirm the correct components.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px;max-width:1100px;\"\u003e\n  \u003cp\u003eReady to find parts for your OMC 4‑Stroke 135–150HP outboard? Browse the main brand collection and filter by horsepower, year, and model.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #0b5; border-radius:6px; text-decoration:none; background:#0b5; color:#fff;\"\u003eShop OMC Parts\u003c\/a\u003e\n  \u003c\/p\u003e\n  \u003cp style=\"color:#555;\"\u003eIf you’re unsure about your model, send us a clear photo of the nameplate and the part you need—we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"exhaust-manifold-gasket-fits-mercruiser-volvo-penta-omc-3-0l-engines-replaces-27-815528-3853256","title":"Exhaust Manifold Gasket for MerCruiser, OMC and Volvo Penta 3.0L\/3.0LX 4-Cylinder Engines – Replaces 27-815528, 3853256","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\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;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    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\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eExhaust Manifold Gasket\u003c\/strong\u003e is designed for selected MerCruiser, OMC and Volvo Penta stern-drive applications using Chevrolet inline 4-cylinder engines, including MerCruiser 3.0L and 3.0LX models. It is supplied as a single gasket for the exhaust manifold connection.\u003c\/p\u003e\n\u003cp\u003eThe gasket is listed for MerCruiser 27-815528, Volvo Penta 3853256, OMC 914578 and OMC 0914578. It also cross-references to Sierra 18-0680, GLM 33580 and Mallory 9-61428.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSingle exhaust manifold gasket for a 4-cylinder marine engine application.\u003c\/li\u003e\n  \u003cli\u003eDirect replacement design for the listed original-equipment references.\u003c\/li\u003e\n  \u003cli\u003eSuitable for the specific engine models and application ranges shown below.\u003c\/li\u003e\n  \u003cli\u003eVerify the engine model, year range and original gasket before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following references are associated with this exhaust manifold gasket. Number references do not replace application verification.\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\u003eReference\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e27-815528 \/ 815528\u003c\/td\u003e\n        \u003ctd\u003eOEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e3853256\u003c\/td\u003e\n        \u003ctd\u003eOEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC\u003c\/td\u003e\n        \u003ctd\u003e914578 \/ 0914578\u003c\/td\u003e\n        \u003ctd\u003eOEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Stern Drive\u003c\/td\u003e\n        \u003ctd\u003e3853256\u003c\/td\u003e\n        \u003ctd\u003eCross-reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-0680\u003c\/td\u003e\n        \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e33580\u003c\/td\u003e\n        \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-61428\u003c\/td\u003e\n        \u003ctd\u003eAftermarket cross-reference\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 the complete engine model and application details before purchase. The listed conditions must match your engine together; a matching part number alone is not sufficient.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel or Application\u003c\/th\u003e\n        \u003cth\u003eEngine Description\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eRelated Reference\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\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eModels 120\/140\u003c\/td\u003e\n        \u003ctd\u003eInline 4-cylinder, 153\/181 CID\u003c\/td\u003e\n        \u003ctd\u003e1982–1995\u003c\/td\u003e\n        \u003ctd\u003e27-815528\u003c\/td\u003e\n        \u003ctd\u003eApplication listed by the company catalog.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e3.0LX \/ 3.0L\u003c\/td\u003e\n        \u003ctd\u003eGM 181 CID, inline 4-cylinder\u003c\/td\u003e\n        \u003ctd\u003e1990 and newer\u003c\/td\u003e\n        \u003ctd\u003e27-815528\u003c\/td\u003e\n        \u003ctd\u003eIncludes the MCM 3.0LX and MCM 3.0L application ranges specified by the company.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMCM 3.0LX\u003c\/td\u003e\n        \u003ctd\u003eInline 4-cylinder\u003c\/td\u003e\n        \u003ctd\u003e1990–1997\u003c\/td\u003e\n        \u003ctd\u003e27-815528\u003c\/td\u003e\n        \u003ctd\u003eSpecific model range listed by the company.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eMCM 3.0L\u003c\/td\u003e\n        \u003ctd\u003eInline 4-cylinder\u003c\/td\u003e\n        \u003ctd\u003e1998 and newer\u003c\/td\u003e\n        \u003ctd\u003e27-815528\u003c\/td\u003e\n        \u003ctd\u003eSpecific model range listed by the company.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e3.0L applications\u003c\/td\u003e\n        \u003ctd\u003eApplication-specific 4-cylinder marine engine\u003c\/td\u003e\n        \u003ctd\u003eVerify by engine model\u003c\/td\u003e\n        \u003ctd\u003e3853256\u003c\/td\u003e\n        \u003ctd\u003eUse the original gasket and engine model to confirm fit.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC Cobra\u003c\/td\u003e\n        \u003ctd\u003e3.0L applications\u003c\/td\u003e\n        \u003ctd\u003eApplication-specific 4-cylinder marine engine\u003c\/td\u003e\n        \u003ctd\u003eVerify by engine model\u003c\/td\u003e\n        \u003ctd\u003e914578 \/ 0914578\u003c\/td\u003e\n        \u003ctd\u003eUse the original gasket and engine model to confirm fit.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eExhaust manifold gasket\u003c\/dd\u003e\n  \u003cdt\u003eQuantity\u003c\/dt\u003e\n  \u003cdd\u003e1 gasket\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eSelected marine stern-drive exhaust manifold applications\u003c\/dd\u003e\n  \u003cdt\u003eEngine Configuration\u003c\/dt\u003e\n  \u003cdd\u003eInline 4-cylinder applications as listed above\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eDirect replacement; installation must follow the engine manufacturer's service procedures\u003c\/dd\u003e\n  \u003cdt\u003eBrand Status\u003c\/dt\u003e\n  \u003cdd\u003eAftermarket replacement part\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 Exhaust Manifold Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo additional manifold, riser gasket, O-ring or complete gasket repair kit is included with this single-gasket listing.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eAllow the engine to cool completely, disconnect the battery and follow the manufacturer's safety procedures.\u003c\/li\u003e\n  \u003cli\u003eDrain or isolate the cooling system as required by the engine service manual.\u003c\/li\u003e\n  \u003cli\u003eRemove the exhaust manifold and discard the old gasket.\u003c\/li\u003e\n  \u003cli\u003eClean the cylinder-head and manifold mating surfaces carefully. Remove old gasket material, rust and debris without damaging the sealing surfaces.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket in the correct orientation. Do not apply sealant unless the engine manufacturer's service manual specifically requires it.\u003c\/li\u003e\n  \u003cli\u003eReinstall the manifold and tighten the fasteners in the specified sequence and to the specified torque.\u003c\/li\u003e\n  \u003cli\u003eRestore the cooling system, reconnect the battery and inspect for exhaust or coolant leaks after starting the engine.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a failing exhaust manifold gasket?\u003c\/summary\u003e\n  \u003cp\u003ePossible signs include an exhaust ticking or tapping noise, soot or carbon marks near the manifold joint, exhaust odor in the engine compartment, coolant leakage and reduced engine performance. Inspect the complete exhaust and cooling system before replacing the gasket.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this gasket fit both MerCruiser 3.0L and 3.0LX engines?\u003c\/summary\u003e\n  \u003cp\u003eYes, the company application data lists MCM 3.0L models from 1998 and newer and MCM 3.0LX models from 1990–1997. Earlier MerCruiser 120\/140 inline 4-cylinder applications from 1982–1995 are also listed. Confirm your exact engine model and original gasket before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this a complete exhaust manifold gasket kit?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for one exhaust manifold gasket only. It does not include the additional gaskets, O-rings or other components found in separate manifold repair kits.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShould sealant be used during installation?\u003c\/summary\u003e\n  \u003cp\u003eInstall the gasket according to the engine manufacturer's service manual. Do not use sealant unless the manual specifically calls for an approved sealant and application method.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhen should the gasket be replaced?\u003c\/summary\u003e\n  \u003cp\u003eThere is no universal replacement interval. Replace the gasket whenever the manifold is removed or when inspection shows leakage, damage or loss of sealing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM gasket?\u003c\/summary\u003e\n  \u003cp\u003eThis is an aftermarket replacement gasket. MerCruiser, Volvo Penta and OMC references are provided for application identification and cross-reference purposes.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eFitment and Safety Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the engine brand, model, year range, cylinder configuration and original gasket reference before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on a part number alone when several engine versions or exhaust configurations exist.\u003c\/li\u003e\n  \u003cli\u003eCompare the replacement gasket's shape and openings with the removed gasket before installation.\u003c\/li\u003e\n  \u003cli\u003eUse proper ventilation and follow all battery, fuel, cooling-system and hot-engine safety procedures during service.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when the required service procedure or torque specifications are unavailable.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We supply application-focused replacement components for marine engines and stern drives.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication Clarity\u003c\/strong\u003e — Product information is organized around engine models, reference numbers and installation requirements.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePractical Support\u003c\/strong\u003e — Compare your original component and confirm fitment details before ordering or installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718264361275,"sku":"23GT304","price":26.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Exhaust_Manifold_Gasket_for_MerCruiser_Stern_Drive_OMC_and_Volvo_Penta_30L_30LX_4-Cyl________27-815528_-_JLM_MARINE-8287571.jpg?v=1762958468"}],"url":"https:\/\/seasierra.com\/collections\/omc-4-stroke-135-150hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}