{"title":"OMC 4-Stroke 5.8L Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e7eb; border-radius:8px;\"\u003e\n  \u003cp\u003e\n    This page is for OMC 4‑Stroke 5.8L marine engines (commonly found in Cobra sterndrive and inboard installations). Use it to find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main OMC\/Johnson\/Evinrude collection for a wider selection. Scroll to the bottom of this page to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow results by horsepower\/displacement, year range, and part category.\n  \u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block; padding:10px 16px; background:#0ea5e9; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse All OMC \/ Johnson \/ Evinrude Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 5.8L Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate location: Look for an ID tag on the intake manifold or valve cover; many OMC installations also include a sticker on the transom bracket or engine cover. Block stampings may be on a pad near the starboard\/front of the engine.\u003c\/li\u003e\n    \u003cli\u003eReading the code: Confirm “5.8L\/351 CID,” carbureted vs EFI, and distributor supplier (often Prestolite). Suffixes can indicate model year or hardware variations.\u003c\/li\u003e\n    \u003cli\u003eCarb vs EFI: Carbureted 5.8L models use a mechanical fuel pump and marine carb; EFI models use an ECU, different ignition module, and matching cap\/rotor.\u003c\/li\u003e\n    \u003cli\u003eDistributor hardware: Some Prestolite distributors use a spring-clip cap while others use a screw-retained cap; caps\/rotors are not interchangeable, so verify before ordering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003e5.8L Carbureted (Ford 351 CID V8)\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;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eNaturally aspirated OHV V8, 4‑stroke, marine carburetor, conventional distributor ignition\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eOMC Cobra 5.8L installations in the early 1990s; inboard variants also seen\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eStrong low‑to‑mid torque, straightforward service, broad parts availability\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eIgnition tune‑up parts vary by distributor (spring‑clip vs screw‑retained). Verify cap\/rotor style before ordering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3 style=\"margin-top:16px;\"\u003e5.8L EFI (Ford 351 CID V8)\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;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eOHV V8, 4‑stroke, multi‑point or throttle‑body EFI (varies by build), ECU‑controlled ignition module\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eOMC Cobra 5.8L EFI packages around the 1993–1994 timeframe\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eImproved cold start and drivability, potentially better fuel economy vs carb\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEFI models use different ignition modules and occasionally a different distributor cap\/rotor set. Always match by model year and distributor hardware.\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:24px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for typical recreational use. Always follow the official service manual for your exact model and duty cycle.\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;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eUse marine‑rated oil; warm engine before draining for best results\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\" target=\"_blank\"\u003eOil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect magnetic drain plug; replace seals if water intrusion is found\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-service-maintenance-kits\" target=\"_blank\"\u003eJohnson\/Evinrude\/OMC Service Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect every 100 hours; replace 200–300 hours or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eCheck gap and condition; fouling indicates mixture or ignition issues\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\" target=\"_blank\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEvery season or 100 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eReplace more often with ethanol fuel or contaminated tanks\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\" target=\"_blank\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eRaw‑water pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEvery 2 seasons (or 1 season in sandy\/silty water)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eCritical for cooling; replace sooner if overheat\/weak stream occurs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\" target=\"_blank\"\u003eWater Pumps\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eAnodes (zinc\/aluminum\/magnesium)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect every 50 hours; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eMatch material to water type (salt\/brackish\/fresh)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\" target=\"_blank\"\u003eJohnson\/Evinrude\/OMC Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eThermostat\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eEvery 2–3 seasons\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eReplace if running cold or unstable temperature control\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" target=\"_blank\"\u003eOMC Parts (General)\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eAlternator\/serpentine belt\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect each service; replace if cracked or glazed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eProper belt tension protects alternator and water pump bearings\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\" target=\"_blank\"\u003eBelts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eIgnition tune‑up (cap\/rotor\/wires)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect annually; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eMatch to distributor style (clip vs screw) and EFI vs carb model\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\" target=\"_blank\"\u003eElectrical Items\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:24px;\"\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\" target=\"_blank\"\u003eJohnson\/Evinrude\/OMC Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System — \u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\" target=\"_blank\"\u003eWater Pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System — \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\" target=\"_blank\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical — \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\" target=\"_blank\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection — \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\" target=\"_blank\"\u003eJohnson\/Evinrude\/OMC Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals — \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\" target=\"_blank\"\u003eLower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion — \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\" target=\"_blank\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"margin-top:24px;\"\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;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eOverheat alarm or weak discharge\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect intake screens, sea strainer, and raw‑water pump; verify thermostat operation\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eWater pump kit, thermostat, intake screen, hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eCheck fuel quality, filter\/water separator, vacuum leaks; inspect spark plugs and ignition leads\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eSpark plugs, plug wires, distributor cap\/rotor, fuel filter\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eConfirm prop condition\/pitch; check timing\/advance, fuel delivery, and for restricted exhaust\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003ePropeller, fuel pump, filters, ignition module\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eLow charging voltage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eInspect belt tension, alternator output, and battery condition\/connections\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eBelt, alternator, battery cables\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eGearcase noise or metal in oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eDrain and inspect gear oil; check prop shaft for fishing line; pressure\/vacuum test for seal leaks\u003c\/td\u003e\n        \u003ctd style=\"padding:8px 0;\"\u003eLower unit seals, bearings, gear oil\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:24px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre ignition and tune‑up parts interchangeable across all 5.8L years?\u003c\/summary\u003e\n    \u003cp\u003eNo. OMC used different distributor hardware (spring‑clip vs screw‑retained caps) and EFI versions may use different modules and caps. Match by model year, carb vs EFI, and distributor style.\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\u003eEvery two seasons is typical for recreational use. Replace sooner (every season) if operated in sandy\/silty water or if any overheat\/weak stream symptoms occur.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should lower unit gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eChange every 100 hours or annually, and always after any known water intrusion or prop‑strike event. Inspect the magnetic drain plug for metal debris.\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\u003ePlease provide the engine model\/serial, carb vs EFI, distributor style (clip or screw cap), and the drive model. 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:24px; padding:16px; border:1px solid #e5e7eb; border-radius:8px;\"\u003e\n  \u003cp\u003eReady to find your parts? Browse the main OMC\/Johnson\/Evinrude collection and use Filter \u0026amp; Sort to narrow by displacement, year, and model.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block; margin-top:8px; padding:10px 16px; background:#0ea5e9; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop OMC \/ Johnson \/ Evinrude Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#374151;\"\u003eIf you’re unsure about your model, send us a clear 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-fits-volvo-penta-4-3l-8-2l-omc-cobra-4-3l-5-8l-replaces-0769578-3853983-3852111-0986506","title":"140°F Thermostat Kit for OMC Cobra and Volvo Penta 7.4L \u0026 8.2L – Replaces 3853983, 0769578, 0986506","description":"\u003cstyle\u003e\n\/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n.ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\/* Base table styles *\/\ntable.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\ntable.ss-table th, table.ss-table td { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\ntable.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\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\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis 140°F (60°C) aftermarket thermostat kit is designed for specified OMC Cobra stern-drive and Volvo Penta stern-drive applications. The documented fitment is limited to 7.4L engines from 1994–1998 and 8.2L engines from 1998. Confirm the engine model, year, original thermostat temperature, and part numbers before ordering.\u003c\/p\u003e\n\u003cp\u003eThe kit replaces the thermostat reference 3853983 and is listed with OMC and Volvo Penta reference numbers 0769578 and 0986506. Sierra Marine 18-3676 is the corresponding 140°F thermostat kit reference.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e140°F (60°C) thermostat opening temperature.\u003c\/li\u003e\n\u003cli\u003eAftermarket replacement for the specified marine stern-drive cooling applications.\u003c\/li\u003e\n\u003cli\u003eKit includes the thermostat, thermostat gasket, and O-ring.\u003c\/li\u003e\n\u003cli\u003eComponent references are provided for identification and fitment verification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the references below to compare the replacement kit with the part installed on your engine. Part-number references do not replace verification of the complete model and year application.\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\u003eReference type\u003c\/th\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC \/ Volvo Penta reference\u003c\/td\u003e\n\u003ctd\u003e3853983\u003c\/td\u003e\n\u003ctd\u003e140°F thermostat reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra reference\u003c\/td\u003e\n\u003ctd\u003e0769578\u003c\/td\u003e\n\u003ctd\u003eThermostat kit reference listed by the company catalog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra reference\u003c\/td\u003e\n\u003ctd\u003e0986506\u003c\/td\u003e\n\u003ctd\u003eThermostat kit reference listed by the company catalog\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra Marine reference\u003c\/td\u003e\n\u003ctd\u003e18-3676\u003c\/td\u003e\n\u003ctd\u003e140°F thermostat kit reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat component\u003c\/td\u003e\n\u003ctd\u003e3853983\u003c\/td\u003e\n\u003ctd\u003eThermostat included in the kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasket component\u003c\/td\u003e\n\u003ctd\u003e3852111\u003c\/td\u003e\n\u003ctd\u003eThermostat gasket included in the kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eO-ring component\u003c\/td\u003e\n\u003ctd\u003e3852071\u003c\/td\u003e\n\u003ctd\u003eO-ring included in the kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe following applications are documented for this 140°F thermostat kit. Do not extend these applications to other engine sizes, years, or thermostat temperatures without confirming the applicable service information.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n\u003ctable class=\"ss-table\" aria-label=\"Engine Compatibility\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand \/ drive type\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eApplication notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra stern drive\u003c\/td\u003e\n\u003ctd\u003e7.4L V8\u003c\/td\u003e\n\u003ctd\u003e1994–1998\u003c\/td\u003e\n\u003ctd\u003e4-Stroke gasoline\u003c\/td\u003e\n\u003ctd\u003e140°F thermostat kit application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta stern drive\u003c\/td\u003e\n\u003ctd\u003e7.4 GL, 7.4 Gi, 7.4 GSi\u003c\/td\u003e\n\u003ctd\u003eVerify by engine model and year\u003c\/td\u003e\n\u003ctd\u003e4-Stroke gasoline\u003c\/td\u003e\n\u003ctd\u003eCompany-listed model family; confirm the original part before purchase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC Cobra \/ Volvo Penta stern drive\u003c\/td\u003e\n\u003ctd\u003e8.2L V8\u003c\/td\u003e\n\u003ctd\u003e1998\u003c\/td\u003e\n\u003ctd\u003e4-Stroke gasoline\u003c\/td\u003e\n\u003ctd\u003e140°F thermostat kit application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo Penta stern drive\u003c\/td\u003e\n\u003ctd\u003e8.2 GL, 8.2 GSi\u003c\/td\u003e\n\u003ctd\u003eVerify by engine model and year\u003c\/td\u003e\n\u003ctd\u003e4-Stroke gasoline\u003c\/td\u003e\n\u003ctd\u003eCompany-listed model family; confirm the original part before purchase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The available catalog evidence specifically identifies the 7.4L application as 1994–1998 and the 8.2L application as 1998. The kit should not be described as fitting all 4.3L, 5.0L, 5.7L, 5.8L, 8.1L, or 8.2L engines without an applicable model-specific confirmation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n\u003cdt\u003eProduct type\u003c\/dt\u003e\n\u003cdd\u003eThermostat kit\u003c\/dd\u003e\n\u003cdt\u003eThermostat temperature\u003c\/dt\u003e\n\u003cdd\u003e140°F \/ 60°C opening temperature\u003c\/dd\u003e\n\u003cdt\u003eApplication\u003c\/dt\u003e\n\u003cdd\u003eMarine gasoline stern-drive cooling systems\u003c\/dd\u003e\n\u003cdt\u003eReplacement type\u003c\/dt\u003e\n\u003cdd\u003eAftermarket replacement\u003c\/dd\u003e\n\u003cdt\u003ePrimary thermostat reference\u003c\/dt\u003e\n\u003cdd\u003e3853983\u003c\/dd\u003e\n\u003cdt\u003eDocumented engine range\u003c\/dt\u003e\n\u003cdd\u003e7.4L, 1994–1998; 8.2L, 1998\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × 140°F (60°C) thermostat\u003c\/li\u003e\n\u003cli\u003e1 × thermostat gasket, reference 3852111\u003c\/li\u003e\n\u003cli\u003e1 × O-ring, reference 3852071\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe included gasket and O-ring are kit components. Their availability as separate replacement parts does not change the package contents of this thermostat kit.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eAllow the engine to cool completely and disconnect the battery before starting work.\u003c\/li\u003e\n\u003cli\u003eClose or isolate the applicable cooling-water and coolant sources according to the engine manufacturer's service procedure.\u003c\/li\u003e\n\u003cli\u003eRemove the thermostat housing cover and note the installed thermostat orientation.\u003c\/li\u003e\n\u003cli\u003eRemove the old thermostat, gasket, and O-ring. Clean the mating surfaces without damaging the housing.\u003c\/li\u003e\n\u003cli\u003eInstall the new thermostat in the same orientation as the original component.\u003c\/li\u003e\n\u003cli\u003eFit the supplied gasket and O-ring in the locations specified for your engine model.\u003c\/li\u003e\n\u003cli\u003eReinstall the housing cover and tighten fasteners to the engine manufacturer's specified torque.\u003c\/li\u003e\n\u003cli\u003eRestore the cooling system, start the engine, and check for leaks and abnormal temperature behavior.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eInstallation procedures can vary between engine models. Use the applicable factory service information for torque values, coolant draining, refill, and bleeding procedures.\u003c\/p\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat temperature does this thermostat open at?\u003c\/summary\u003e\n\u003cp\u003eThis kit is listed as a 140°F (60°C) thermostat kit. Verify that your engine requires this temperature before installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich engines are documented for this kit?\u003c\/summary\u003e\n\u003cp\u003eThe company catalog documents 7.4L applications from 1994–1998 and 8.2L applications from 1998. It also lists Volvo Penta 7.4 GL, 7.4 Gi, 7.4 GSi, 8.2 GL, and 8.2 GSi model families. Confirm the exact engine model, year, and original part number.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat parts are included?\u003c\/summary\u003e\n\u003cp\u003eThe kit includes one thermostat, one thermostat gasket, and one O-ring. The component references are thermostat 3853983, gasket 3852111, and O-ring 3852071.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this an OEM thermostat?\u003c\/summary\u003e\n\u003cp\u003eNo. This listing is for an aftermarket replacement kit. The OEM and aftermarket reference numbers are supplied for identification and compatibility comparison only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use this kit on a 4.3L, 5.0L, 5.7L, or 5.8L engine?\u003c\/summary\u003e\n\u003cp\u003eThose applications are not confirmed for this specific kit by the company record used for this listing. Match your exact engine model, year, thermostat temperature, and original part number before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are common signs of a thermostat problem?\u003c\/summary\u003e\n\u003cp\u003ePossible symptoms include overheating, an engine that runs unusually cool, unstable temperature readings, or coolant leakage near the thermostat housing. Diagnose the complete cooling system before replacing the thermostat.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWork only on a cool engine and follow the applicable marine engine service procedure.\u003c\/li\u003e\n\u003cli\u003eDo not rely on engine size alone for fitment; verify model, year, thermostat temperature, and original part number.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended when the cooling-system procedure or engine-specific requirements are uncertain.\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 Parts Support\u003c\/strong\u003e — We provide replacement components for marine maintenance and repair applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment-Focused Listings\u003c\/strong\u003e — Product references and documented applications are presented to help customers verify compatibility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePractical Replacement Solutions\u003c\/strong\u003e — Aftermarket components are offered for routine marine service needs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723970744635,"sku":"23TH018","price":30.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Thermostat_Kit_for_Volvo_Penta_43L_50L_57L_74L_81L_0769578_3853983_3852111___________3853983_-_JLM_MARINE-8291118.jpg?v=1763038813"}],"url":"https:\/\/seasierra.com\/collections\/omc-4-stroke-5-8l-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}