{"title":"OMC 4-Stroke 90-454HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eThis page is for OMC 4-Stroke 90–454HP outboard engines and helps you quickly find compatible parts and essential service information. It includes maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Johnson\/Evinrude\/OMC collection. Scroll to the bottom of the page to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block;padding:10px 14px;border:1px solid #1b4; border-radius:6px; text-decoration:none;\"\u003eBrowse All Johnson\/Evinrude\/OMC Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 90–454HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the nameplate\/serial label on the transom bracket or swivel bracket; some models place it on the clamp bracket or engine mid‑section.\u003c\/li\u003e\n    \u003cli\u003eRecord the full model code and serial number. Suffix characters often indicate shaft length, control type, and model year\/series.\u003c\/li\u003e\n    \u003cli\u003eConfirm 4‑Stroke designation on the cowl or in the model code. Many mid‑range units are inline‑4 EFI; higher outputs may use V6 platforms.\u003c\/li\u003e\n    \u003cli\u003eWhen ordering cooling and gearcase components (impellers, seals, anodes), verify by exact model and serial, as these often vary by platform and year.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eInline‑4 EFI 4‑Stroke (90 HP class)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eInline‑4 fuel‑injected 4‑Stroke design; electric start and power trim\/tilt on most models.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003eOMC\/Johnson‑branded 90HP 4‑Stroke variants (platform details vary by year and revision).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eQuiet operation, strong mid‑range torque, and efficient fuel consumption.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eCooling‑system and gearcase parts are often model‑specific. Always confirm by model and serial.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eOther 4‑Stroke Platforms in Range\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eMid‑range inline‑4 EFI and higher‑output V6 4‑Stroke platforms may be present within the 90–454HP span depending on model year and branding.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003eJohnson\/OMC 4‑Stroke outboards across mid‑to‑higher horsepower classes; exact architecture varies by series and year.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eBroad torque curves and improved efficiency versus comparable 2‑Stroke predecessors.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eParts such as impeller kits, thermostats, anodes, and gearcase seals can differ by year\/platform; verify before ordering.\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 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 4‑Stroke outboards. Always follow your engine’s official service manual for exact procedures and torque specifications.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd\u003eFirst 20 hrs, then every 100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eUse FC‑W 10W‑30\/40 per spec; warm engine before draining; replace drain plug washer if applicable.\u003c\/td\u003e\n        \u003ctd\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\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or annually; inspect after impacts\u003c\/td\u003e\n        \u003ctd\u003eCheck for water intrusion (milky oil). Replace drain screw gaskets; service seals if leaks are found.\u003c\/td\u003e\n        \u003ctd\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\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd\u003eInspect 100 hrs; replace 300 hrs or 3 years\u003c\/td\u003e\n        \u003ctd\u003eVerify specified heat range and gap; replace sooner if fouled or misfire occurs.\u003c\/td\u003e\n        \u003ctd\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\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd\u003eInspect 50–100 hrs; replace 100–200 hrs or if contaminated\u003c\/td\u003e\n        \u003ctd\u003eUse 10‑micron filtration; drain water if equipped; prime the system after service.\u003c\/td\u003e\n        \u003ctd\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\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd\u003eEvery 2–3 years (sooner in sandy\/silty water)\u003c\/td\u003e\n        \u003ctd\u003eReplace housing if worn or scored; verify a strong telltale stream after service.\u003c\/td\u003e\n        \u003ctd\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\u003eAnodes (zincs)\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50 hrs; replace when ~50% depleted\u003c\/td\u003e\n        \u003ctd\u003eMatch alloy to water type (salt, brackish, fresh). Maintain clean metal‑to‑metal contact.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eJohnson\/Evinrude\/OMC Anodes\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 0;\"\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\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\"\u003eFuel Pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/starters\"\u003eStarters\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/sensors\"\u003eSensors\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\u003ePropulsion – \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-propellers\"\u003eJohnson\/Evinrude\/OMC Propellers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/propeller-guards\"\u003ePropeller Guards\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eAccessories \u0026amp; Trim – \u003ca href=\"https:\/\/seasierra.com\/collections\/outboard-hydrofoil-stabilizers\"\u003eOutboard Hydrofoil Stabilizers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/boat-accessories\"\u003eBoat Accessories\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eWeak telltale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect intake screens for debris; verify impeller and thermostat function; confirm hose routing is not kinked.\u003c\/td\u003e\n        \u003ctd\u003eWater pump kit, thermostat, intake screen, anodes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd\u003eCheck for damaged prop or spun hub; replace fuel filter; inspect spark plugs; verify clean, fresh fuel.\u003c\/td\u003e\n        \u003ctd\u003ePropeller, fuel filter, spark plugs, fuel pump\/injectors\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd\u003eConfirm battery voltage; squeeze primer bulb; look for air leaks in fuel lines; verify plug gap and condition.\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, fuel filter, starter circuit components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd\u003eDrain and inspect gear lube; check for water intrusion; inspect prop shaft and seals after any impact.\u003c\/td\u003e\n        \u003ctd\u003eLower unit seal kit, bearings, gear lube, propeller\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 0;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eNot always. Cooling and gearcase components—such as impellers, seals, and anodes—often change with platform revisions and year updates. Verify compatibility using your exact model code and serial number.\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 rule of thumb, every 2–3 years, or sooner if operating in sandy\/silty water or if you notice a weak telltale or overheat warnings.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change the gear oil?\u003c\/summary\u003e\n    \u003cp\u003eService the lower unit every 100 hours or annually, and immediately after any prop strike or suspected water intrusion. Milky oil indicates contamination and the need to inspect seals.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide brand (OMC\/Johnson), horsepower, 4‑Stroke designation, complete model code, serial number, year (if known), shaft length, and clear photos of the nameplate and the part you’re replacing.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main Johnson\/Evinrude\/OMC collection to locate components that fit your OMC 4‑Stroke outboard.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block;padding:10px 14px;border:1px solid #1b4; border-radius:6px; text-decoration:none;\"\u003eShop Johnson\/Evinrude\/OMC Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#555;\"\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":"thermostat-kit-160-f-fits-omc-cobra-volvo-penta-3-8l-7-5l-v6-v8-replaces-383307-3856961","title":"Thermostat Kit 160°F – Fits OMC Cobra \u0026 Volvo Penta 3.8L-7.5L V6\/V8 (Replaces 383307, 3856961)","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\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eMarine Thermostat Kit 160°F\u003c\/strong\u003e is a complete replacement kit for OMC Cobra and Volvo Penta marine engines. It includes a 160°F (71°C) thermostat and all gaskets necessary for installation on V6 and V8 engines, including OMC Cobra models from 1969–1988 (3.8L-7.5L) and various Volvo Penta 4.3L, 5.0L, 5.7L, and 5.8L sterndrive models.\u003c\/p\u003e\n\u003cp\u003eThis kit serves as a direct cross-reference for OMC parts 379754, 383307, 3852216, 3856961; Volvo Penta 3856961; Sierra 18-3653\/18-3554; GLM 13430\/13060; and Mallory 9-43156\/9-43021.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEngineered for direct OEM-replacement fitment.\u003c\/li\u003e\n\u003cli\u003eMaintains a consistent 160°F (71°C) operating temperature.\u003c\/li\u003e\n\u003cli\u003eIncludes thermostat and all required gaskets for a complete installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\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 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\u003eOMC\u003c\/td\u003e\n        \u003ctd\u003e379754\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC\u003c\/td\u003e\n        \u003ctd\u003e383307\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC\u003c\/td\u003e\n        \u003ctd\u003e3852216\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOMC\u003c\/td\u003e\n        \u003ctd\u003e3856961\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e3856961\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3653\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-3554\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e13430\u003c\/td\u003e\n      \u003c\/tr\u003e\n       \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e13060\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-43156\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-43021\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\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\u003eFits a wide range of OMC Cobra Sterndrive and Marine Engines produced between 1969 and 1988.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"OMC Cobra 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\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e3.8L\u003c\/td\u003e\n\u003ctd\u003e80-120\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1981–1985\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eSmall thermostat version\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e4.3L\u003c\/td\u003e\n\u003ctd\u003e120-205\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1985–1986\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eSmall thermostat version\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e5.0L\u003c\/td\u003e\n\u003ctd\u003e140-230\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1982–1988\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eSmall thermostat version\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e5.7L\u003c\/td\u003e\n\u003ctd\u003e175-260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1982–1988\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eSmall thermostat version\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e7.5L\u003c\/td\u003e\n\u003ctd\u003e320-330\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1982–1988\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eSmall thermostat version\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e90\u003c\/td\u003e\n\u003ctd\u003e90\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1970\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive model\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972–1973\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive model\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e120\u003c\/td\u003e\n\u003ctd\u003e120\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1969–1980\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive model\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e140\u003c\/td\u003e\n\u003ctd\u003e140\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1973–1980\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive model\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e155\u003c\/td\u003e\n\u003ctd\u003e155\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1969–1972\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive model\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e165-175\u003c\/td\u003e\n\u003ctd\u003e165-175\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1972–1977\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e185-200\u003c\/td\u003e\n\u003ctd\u003e185-200\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978–1981\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e210-245\u003c\/td\u003e\n\u003ctd\u003e210-245\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1969–1975\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e250-260\u003c\/td\u003e\n\u003ctd\u003e250-260\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1970–1981\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e305-454\u003c\/td\u003e\n\u003ctd\u003e305-454\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e1977–1982\u003c\/td\u003e\n\u003ctd\u003e383307\u003c\/td\u003e\n\u003ctd\u003eOutdrive models\u003c\/td\u003e\n    \u003c\/tr\u003e\n\u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003eCompatible with various Volvo Penta Four-Stroke V6 and V8 marine engines.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Volvo Penta 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\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\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e4.3GL\/GS\/Gi\u003c\/td\u003e\n\u003ctd\u003e140-225\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3856961\u003c\/td\u003e\n\u003ctd\u003eV6 Engine\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e5.0FL\/Fi\u003c\/td\u003e\n\u003ctd\u003e170-220\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3856961\u003c\/td\u003e\n\u003ctd\u003eV8 Engine\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e5.7GL\/Gi\u003c\/td\u003e\n\u003ctd\u003e200-280\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3856961\u003c\/td\u003e\n\u003ctd\u003eV8 Engine\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003e5.8FL\/Fi\/FSi\u003c\/td\u003e\n\u003ctd\u003e200-300\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3856961\u003c\/td\u003e\n\u003ctd\u003eV8 Engine\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003eV6-200\/225\/225E\u003c\/td\u003e\n\u003ctd\u003e200-225\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3856961\u003c\/td\u003e\n\u003ctd\u003eV6 Engine\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo Penta\u003c\/td\u003e\n\u003ctd\u003eV8-225\/270\/300\/320\/380\u003c\/td\u003e\n\u003ctd\u003e225-380\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003e3856961\u003c\/td\u003e\n\u003ctd\u003eV8 Engine\u003c\/td\u003e\n    \u003c\/tr\u003e\n\u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eMarine Engine Thermostat Kit\u003c\/dd\u003e\n  \u003cdt\u003eTemperature Rating\u003c\/dt\u003e\n\u003cdd\u003e160°F (71°C)\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/metallic\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e2.82 oz (0.08 kg)\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eSmall thermostat applications in OMC and Volvo Penta engines\u003c\/dd\u003e\n  \u003cdt\u003eProduction Standard\u003c\/dt\u003e\n\u003cdd\u003eISO9002 certified factory\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eManufacturer warranty (varies by supplier)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Thermostat (383307)\u003c\/li\u003e\n\u003cli\u003e1 x O-ring (3852071)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket (314809)\u003c\/li\u003e\n\u003cli\u003e1 x Gasket (313416)\u003c\/li\u003e\n\u003cli\u003e1 x Housing Gasket (3852111)\u003c\/li\u003e\n\u003cli\u003e1 x Installation Instructions (when included by manufacturer)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect the battery terminals to ensure safety.\u003c\/li\u003e\n\u003cli\u003ePlace a catch pan under the engine and drain the coolant below the level of the thermostat housing.\u003c\/li\u003e\n\u003cli\u003eLocate the thermostat housing and remove the bolts or nuts securing it.\u003c\/li\u003e\n\u003cli\u003eGently tap the housing to break the seal and remove it. Take note of the old thermostat's orientation.\u003c\/li\u003e\n\u003cli\u003eRemove the old thermostat and all gasket material from both the housing and the engine mating surfaces.\u003c\/li\u003e\n\u003cli\u003eInstall the new thermostat in the correct orientation.\u003c\/li\u003e\n\u003cli\u003ePlace the new gaskets and O-rings as required by your specific engine model.\u003c\/li\u003e\n\u003cli\u003eReinstall the thermostat housing and tighten the fasteners to the manufacturer's recommended torque.\u003c\/li\u003e\n\u003cli\u003eRefill the cooling system with the appropriate coolant mixture.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery, start the engine, and let it warm up. Check carefully for any leaks around the housing.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm this thermostat fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eThe best way is to cross-reference your existing part number with our Part Number Matrix. Additionally, check your engine model and year against the compatibility tables. If you are unsure, please consult your service manual or a professional marine mechanic.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a faulty thermostat?\u003c\/summary\u003e\n  \u003cp\u003eCommon symptoms include engine overheating (reading high on the temp gauge), the engine not reaching operating temperature (running too cool), or large, sudden fluctuations in temperature. Leaking coolant around the thermostat housing is also an indicator.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I use a different temperature thermostat?\u003c\/summary\u003e\n  \u003cp\u003eIt's highly recommended to use the temperature rating specified by your engine's manufacturer (160°F for this kit). Using a hotter or colder thermostat can affect engine performance, fuel efficiency, and longevity.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should a marine thermostat be replaced?\u003c\/summary\u003e\n  \u003cp\u003eThermostats don't have a fixed replacement interval, but they are a common wear item. It is good practice to inspect them during routine cooling system service or replace them every few hundred hours or every few years, especially if operating in saltwater.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n  \u003cp\u003eThis is a high-quality aftermarket replacement, not an OEM component. It is designed and manufactured to meet or exceed OEM specifications for fit, form, and function, produced in an ISO 9002 certified facility to ensure quality and reliability.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are your shipping speeds and costs?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders, with expedited options available at checkout where applicable.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for items that are unused and in their original condition.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection\u003e\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not order.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is highly recommended for safety, performance, and to prevent engine damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\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 rigorously tested for real-world reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with an average transit time of 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718269899067,"sku":"23TH618","price":24.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23TH618_1_45ac0051-3ad4-43cb-b1d2-349e2bf7ac4c.jpg?v=1762958687"}],"url":"https:\/\/seasierra.com\/collections\/omc-4-stroke-90-454hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}