{"title":"OMC 4-Stroke 3.0-8.2L Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e7eb; border-radius:8px;\"\u003e\n  \u003cp\u003eThis page focuses on OMC 4‑Stroke 3.0–8.2L marine engines, helping you find compatible replacement 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, and at the bottom of this page you’ll find links to start browsing parts for these engines. On the collection pages, 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; 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 3.0–8.2L Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the ID plate: Common locations include the flame arrestor cover, bellhousing\/flywheel housing, or the starboard side of the block. Some Cobra sterndrive set‑ups also have identification on the transom assembly.\u003c\/li\u003e\n    \u003cli\u003eDecode the model\/serial: OMC tags often indicate displacement (3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L), induction (carb, TBI\/MPI), and drive family. The serial number helps confirm year range and harness\/ignition variations.\u003c\/li\u003e\n    \u003cli\u003eRecognize the platform: 3.0L is an inline‑4 (181 CID); 4.3L is a V6 (262 CID); 5.0\/5.7L are small‑block V8s (305\/350 CID); 7.4\/8.2L are big‑block V8s (454\/502 CID).\u003c\/li\u003e\n    \u003cli\u003eCooling type matters: Raw‑water (RWC) vs. closed‑cooling (FWC\/heat‑exchanger) impacts thermostat housings, hose routing, and service parts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eEngine Platform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003e3.0L Inline‑4 (181 CID)\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\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eInline‑4, carbureted or TBI EFI, 4‑stroke marine long block (often 181 CID).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003eOMC 3.0L sterndrive packages; Marine Power\/GM‑based 3.0L variants.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eSimplicity, good fuel economy, easy access to service items.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eElectrical harnesses and many accessories are shared across 3.0–8.2L families; verify pulley\/belt layouts and cooling type.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e4.3L V6 (262 CID)\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\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003e90° V6, carb or TBI\/MPI, 4‑stroke.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003eOMC 4.3L sterndrive packages with RWC or FWC.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eCompact V6 with strong mid‑range torque and wide parts availability.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eThermostat housings and hose layouts differ between RWC and FWC; alternator brackets vary by sea pump mounting.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e5.0\/5.7L Small‑Block V8 (305\/350 CID)\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\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eSmall‑block V8, carb or TBI\/MPI, 4‑stroke.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003eOMC 5.0\/5.7L sterndrive packages; multiple ignition and fuel system variants.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eBroad torque curve, excellent aftermarket support.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eExhaust riser height and outlet configuration affect backpressure; match manifolds\/risers to your installation.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e7.4\/8.2L Big‑Block V8 (454\/502 CID)\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\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eBig‑block V8, carb or EFI, 4‑stroke.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003eOMC 7.4\/8.2L sterndrive\/inboard packages aimed at high‑output applications.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eHigh torque and power with heavy‑duty cooling and exhaust components.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eCooling and accessory drive parts differ from small‑blocks; confirm pulley count, belt length, and pump type.\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 and your exact engine’s maintenance schedule.\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\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd\u003eUse marine‑rated oil; change filter at each oil service.\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\u003eSterndrive gear oil\u003c\/td\u003e\n        \u003ctd\u003eAnnually or every 100 hours\u003c\/td\u003e\n        \u003ctd\u003eInspect for water intrusion\/metal; replace seals if contamination is found.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-service-maintenance-kits\"\u003eMerCruiser Service \u0026amp; Maintenance 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 hours; replace 200 hours or as needed\u003c\/td\u003e\n        \u003ctd\u003eCheck gap and condition; misfires or hard starts warrant replacement.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plug\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd\u003eReplace canister and drain periodically; contaminated fuel requires sooner 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\u003eRaw‑water impeller \/ sea pump\u003c\/td\u003e\n        \u003ctd\u003eEvery 2 seasons (or 100–200 hours)\u003c\/td\u003e\n        \u003ctd\u003eInspect annually; replace sooner if overheat or weak flow occurs.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-impellers\"\u003eMerCruiser Impellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAnodes\u003c\/td\u003e\n        \u003ctd\u003eInspect every 30–60 days; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd\u003eMatch alloy to water type (zinc, aluminum, magnesium as applicable).\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-anodes\"\u003eMerCruiser Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAccessory belts\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50 hours; replace 2–3 seasons\u003c\/td\u003e\n        \u003ctd\u003eLook for cracking, glazing, or chirp; verify proper tension.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eBelt\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eThermostat \u0026amp; gaskets\u003c\/td\u003e\n        \u003ctd\u003eTest annually; replace 2–3 seasons or if overheating\u003c\/td\u003e\n        \u003ctd\u003eRWC vs. FWC housings use different gaskets and temperatures.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-gaskets\"\u003eMerCruiser Gaskets\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCharging system check\u003c\/td\u003e\n        \u003ctd\u003eAnnually\u003c\/td\u003e\n        \u003ctd\u003eLoad‑test the battery and verify alternator output and belt condition.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-alternators\"\u003eMerCruiser Alternators\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\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System: \u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\"\u003eWater pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System: \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical: \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCharging \u0026amp; Starting: \u003ca href=\"https:\/\/seasierra.com\/collections\/alternators\"\u003eAlternators\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGaskets \u0026amp; Sealing: \u003ca href=\"https:\/\/seasierra.com\/collections\/gaskets\"\u003eGaskets\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eHoses \u0026amp; Plumbing: \u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\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\u003eWeak water stream \/ overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect sea strainer and intake; check raw‑water impeller, pump housing, belts, and thermostat.\u003c\/td\u003e\n        \u003ctd\u003eWater pump impeller kit, pump housing, thermostat, intake screen, hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd\u003eVerify fuel quality; replace fuel\/water separator; inspect anti‑siphon valve, spark plugs, and ignition timing.\u003c\/td\u003e\n        \u003ctd\u003eFuel filter\/separator, spark plugs, ignition wires, anti‑siphon valve\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd\u003eCheck battery voltage\/grounds; inspect IAC\/TBI idle circuits or carb idle mixture; confirm no vacuum leaks.\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, electrical grounds, IAC valve (EFI\/TBI), carb service kit, vacuum hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise \/ metal in gear oil\u003c\/td\u003e\n        \u003ctd\u003eDrain and inspect oil; check for water intrusion; assess U‑joints and gimbal bearing condition.\u003c\/td\u003e\n        \u003ctd\u003eGear lube, seal kit, U‑joints, gimbal bearing\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 parts interchangeable between different years or engine platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome components (harnesses, senders, alternators) span multiple displacements, but many items depend on platform (inline‑4, V6, small‑block V8, big‑block V8), fuel system (carb vs. TBI\/MPI), and cooling type (RWC vs. FWC). Confirm your serial\/model data before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the raw‑water impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eInspect annually and replace every two seasons (or sooner if there’s any overheat event, weak flow, or vane set). Boats used in sandy or silty water may need more frequent service.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should sterndrive gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eAs a general guideline, change gear oil every 100 hours or annually. If oil appears milky or metallic, address seals and inspect internal components.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eEngine serial\/model number, displacement (3.0\/4.3\/5.0\/5.7\/7.4\/8.2L), fuel system type (carb\/TBI\/MPI), cooling type (RWC\/FWC), and the sterndrive model\/serial. Photos of the nameplate and the part being replaced are very helpful.\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 what you need? Browse the main OMC\/Johnson‑Evinrude collection by horsepower, year, and model to locate compatible parts for your 3.0–8.2L engine family.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-outboard-parts\" style=\"display:inline-block; padding:10px 14px; background:#0ea5e9; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop OMC \/ Johnson‑Evinrude Collections\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#4b5563;\"\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":"lower-unit-gearcase-seal-kit-fits-volvo-penta-sx-omc-cobra-sx-3-0-8-2l-v6-v8-replaces-3855275","title":"Lower Unit Gearcase Seal Kit for Volvo Penta SX Sterndrives Through 2006 – Replaces 3855275","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eLower Unit Gearcase Seal Kit\u003c\/strong\u003e is intended for Volvo Penta SX sterndrives through 2006. The company fitment information specifically lists SX-C, SX-C1, SX-C2, SX-CT, SX-CT1, SX-CT2, SX-M, SX-M1, SX-MTD, SX-MTD3, SX-RT1, and SX-RT2 models.\u003c\/p\u003e\n\u003cp\u003eThe kit is listed as a replacement for Volvo Penta OEM numbers \u003cstrong\u003e3855275\u003c\/strong\u003e and \u003cstrong\u003e0778351\u003c\/strong\u003e. Sierra 18-2598 is the documented aftermarket reference for this seal kit. Always compare the original component and sterndrive model before ordering.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGear housing and lower unit seal kit for Volvo Penta SX applications.\u003c\/li\u003e\n\u003cli\u003eDesigned to help restore sealing at serviced gearcase locations.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended because lower-unit disassembly and seal replacement require specialized procedures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following numbers are supplier-listed OEM, aftermarket, or reference numbers associated with this gear housing seal kit. They are provided for identification and cross-reference purposes; verify the application before purchase.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand or Reference\u003c\/th\u003e\n        \u003cth\u003ePart Number\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\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e3855275\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\u003e0778351\u003c\/td\u003e\n        \u003ctd\u003eOEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-2598\u003c\/td\u003e\n        \u003ctd\u003eAftermarket reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSEI Marine\u003c\/td\u003e\n        \u003ctd\u003e95-115-11K\u003c\/td\u003e\n        \u003ctd\u003eSupplier-listed reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e87750\u003c\/td\u003e\n        \u003ctd\u003eSupplier-listed reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEvinrude \/ Johnson \/ OMC \/ BRP\u003c\/td\u003e\n        \u003ctd\u003e778351\u003c\/td\u003e\n        \u003ctd\u003eSupplier-listed 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\u003eFitment is determined by the sterndrive model and gear housing configuration rather than by engine displacement alone. The company application is for Volvo Penta SX sterndrives through 2006, including the model variants below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Volvo Penta SX Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eDrive Family\u003c\/th\u003e\n        \u003cth\u003eApplication Range\u003c\/th\u003e\n        \u003cth\u003eOEM 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\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eSX-C, SX-C1, SX-C2\u003c\/td\u003e\n        \u003ctd\u003eThrough 2006\u003c\/td\u003e\n        \u003ctd\u003e3855275 \/ 0778351\u003c\/td\u003e\n        \u003ctd\u003eLower unit gearcase seal kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eSX-CT, SX-CT1, SX-CT2\u003c\/td\u003e\n        \u003ctd\u003eThrough 2006\u003c\/td\u003e\n        \u003ctd\u003e3855275 \/ 0778351\u003c\/td\u003e\n        \u003ctd\u003eLower unit gearcase seal kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eSX-M, SX-M1, SX-MTD, SX-MTD3\u003c\/td\u003e\n        \u003ctd\u003eThrough 2006\u003c\/td\u003e\n        \u003ctd\u003e3855275 \/ 0778351\u003c\/td\u003e\n        \u003ctd\u003eLower unit gearcase seal kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eSX-RT1, SX-RT2\u003c\/td\u003e\n        \u003ctd\u003eThrough 2006\u003c\/td\u003e\n        \u003ctd\u003e3855275 \/ 0778351\u003c\/td\u003e\n        \u003ctd\u003eLower unit gearcase seal kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eLower unit gearcase seal kit\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eVolvo Penta SX sterndrives through 2006\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eProfessional installation recommended\u003c\/dd\u003e\n  \u003cdt\u003eOEM References\u003c\/dt\u003e\n  \u003cdd\u003e3855275 and 0778351\u003c\/dd\u003e\n  \u003cdt\u003eAftermarket Reference\u003c\/dt\u003e\n  \u003cdd\u003eSierra 18-2598\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cp\u003eThis listing is for one lower unit gearcase seal kit. The company source identifies the product as a gear housing seal kit but does not provide a verified itemized component list or quantities. Do not assume that individual seals, O-rings, water-tube seals, or gaskets shown in another application are included unless they are confirmed against the supplied kit.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eConfirm the sterndrive model and compare the original seal kit or OEM reference before beginning work.\u003c\/li\u003e\n\u003cli\u003eDisconnect the battery and follow the sterndrive manufacturer's safety procedures.\u003c\/li\u003e\n\u003cli\u003eDrain the gearcase lubricant into a suitable container and inspect it for water contamination or metal debris.\u003c\/li\u003e\n\u003cli\u003eRemove the propeller and lower unit according to the manufacturer's service procedure.\u003c\/li\u003e\n\u003cli\u003eDisassemble only as required to access the seals and sealing surfaces.\u003c\/li\u003e\n\u003cli\u003eRemove old seals carefully to avoid damaging shafts, bores, mating surfaces, or the gear housing.\u003c\/li\u003e\n\u003cli\u003eClean and inspect all sealing surfaces before installing replacement components.\u003c\/li\u003e\n\u003cli\u003eInstall the new seals using the correct tools, orientation, lubricant, and sealant specified by the service manual.\u003c\/li\u003e\n\u003cli\u003eReassemble the lower unit and torque all fasteners to the manufacturer's specifications.\u003c\/li\u003e\n\u003cli\u003eRefit the lower unit, refill it with the manufacturer's specified marine gear lubricant, and install the plugs with serviceable seals.\u003c\/li\u003e\n\u003cli\u003eInspect for leaks before operating the vessel and recheck lubricant condition after an initial test run.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know if my gearcase seals may be failing?\u003c\/summary\u003e\n\u003cp\u003ePossible indicators include milky or water-contaminated gear lubricant, visible lubricant around the gearcase or propeller-shaft area, or a recurring loss of lubricant. A pressure or vacuum test performed with the correct service equipment can help locate a leak.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich drives does this kit fit?\u003c\/summary\u003e\n\u003cp\u003eThe company application is for Volvo Penta SX sterndrives through 2006, including SX-C, SX-C1, SX-C2, SX-CT, SX-CT1, SX-CT2, SX-M, SX-M1, SX-MTD, SX-MTD3, SX-RT1, and SX-RT2. Confirm the exact drive variant and original part number before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n\u003cp\u003eNo. This is an aftermarket replacement seal kit. The listed OEM numbers are provided as application references and do not indicate that the kit is manufactured by Volvo Penta.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the kit include every seal and O-ring shown in other listings?\u003c\/summary\u003e\n\u003cp\u003eNot necessarily. The company source identifies this product as a gear housing seal kit but does not publish a verified itemized contents list. Confirm the package contents before installation if a specific seal or gasket is required.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I install the kit myself?\u003c\/summary\u003e\n\u003cp\u003eProfessional installation is recommended. Lower-unit seal replacement may require specialized pullers, drivers, pressure-testing equipment, service specifications, and careful alignment of internal components.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat should I check before ordering?\u003c\/summary\u003e\n\u003cp\u003eCheck the sterndrive model designation, model year or production range, original seal-kit number, gear housing configuration, and the physical dimensions or appearance of the original components. A model that appears similar is not sufficient confirmation of fitment.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUse the manufacturer's service manual for disassembly, seal orientation, torque values, lubricant specifications, and pressure-testing procedures.\u003c\/li\u003e\n\u003cli\u003eDo not operate the vessel if the gearcase shows lubricant leakage or water contamination.\u003c\/li\u003e\n\u003cli\u003eVerify the complete sterndrive identification and original part number before purchase.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement part, not an Original Equipment Manufacturer component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is strongly recommended.\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 replacement components for service and repair applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication-Focused Information\u003c\/strong\u003e — Product references and fitment details are provided to help customers compare their original part and drive model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupport for Proper Selection\u003c\/strong\u003e — When model or part-number details differ, verify the application before ordering or consult a qualified marine technician.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963437371,"sku":"23SK605","price":34.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/GearcaseSealKit87750_879b8c97-81b2-4792-ab71-fad217ee9b43.png?v=1763038499"}],"url":"https:\/\/seasierra.com\/collections\/omc-4-stroke-3-0-8-2l-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}