{"title":"Force 2-Stroke Outboard Engine 50-125HP Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp\u003eBuilt for Force 2‑Stroke 50–125HP outboard engines, this page helps you locate compatible parts and key service information. Below you’ll find maintenance tips, commonly replaced parts, and troubleshooting guidance. You can also browse the main Force collection, and at the bottom of this page you can start browsing parts for these engines. On the collection page, use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\" style=\"display:inline-block;padding:10px 14px;border:1px solid #1f4b99;border-radius:6px;text-decoration:none;\"\u003eBrowse All Force Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 50–125HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the nameplate\/serial tag on the transom bracket or swivel bracket. Record both model and serial numbers.\u003c\/li\u003e\n    \u003cli\u003eModel suffixes often indicate shaft length (e.g., L\/XL) and control type (tiller vs. remote). Year codes can vary—verify against your manual or existing components.\u003c\/li\u003e\n    \u003cli\u003ePlatform clues: 50–90HP models are typically 2‑ or 3‑cylinder carbureted units; 120\/125HP models are usually inline‑4. Later units may use Mercury‑era gearcases\/ignition.\u003c\/li\u003e\n    \u003cli\u003eWhen choosing water pump or seal kits, visually match the impeller housing and driveshaft spline count to your existing parts for best fit.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003e50–90HP Legacy Force (Chrysler‑lineage) 2‑Stroke\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:920px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\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‑2 or inline‑3, carbureted 2‑stroke; premix or oil‑injection depending on year.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e50, 70, 85, 90 HP 2‑stroke models (spec varies by year and shaft length).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eLightweight with straightforward carb setup and responsive mid‑range.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eConfirm gearcase style and water pump housing before ordering kits; some parts vary by production year.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e120–125HP Inline‑4 (some Mercury‑era components)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:920px;border-collapse:collapse;margin-top:10px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\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 2‑stroke; some years share Mercury‑sourced ignition\/gearcase patterns.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e120\/125HP variants from late 1980s–1990s (specs vary by serial and shaft).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eStrong torque for bigger boats and broad parts availability on Mercury‑era units.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eVisually confirm impeller housing, wear plate\/cup, and driveshaft spline to select the correct pump kit. Match old seals when servicing the lower unit.\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:12px 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 2‑stroke outboards. Always follow the procedures and schedules in your official service manual and adjust for operating conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:980px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eLower unit gear oil\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eInspect for water\/metal; replace drain\/fill sealing washers. Pressure\/vac test if contamination is found.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd\u003e100 hrs or annually\u003c\/td\u003e\n        \u003ctd\u003eVerify correct heat range and gap; replace if fouled or worn.\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\u003e100 hrs or as needed\u003c\/td\u003e\n        \u003ctd\u003eReplace inline filters; drain\/replace water‑separating elements.\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 seasons\u003c\/td\u003e\n        \u003ctd\u003eReplace impeller; inspect housing, wear plate, and cup. Shorten interval for sandy\/silty use.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-water-pump-repair-kits\"\u003eForce 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 each service\u003c\/td\u003e\n        \u003ctd\u003eUse alloy for your water type (salt\/brackish\/fresh). Keep clean for best protection.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eLower unit seal kit (if leakage found)\u003c\/td\u003e\n        \u003ctd\u003eAs required\u003c\/td\u003e\n        \u003ctd\u003eReseal after failed pressure\/vac test or if oil shows milky\/metallic contamination.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-lower-unit-seal-kits\"\u003eForce Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOil‑injection service or premix check\u003c\/td\u003e\n        \u003ctd\u003eInspect each season\u003c\/td\u003e\n        \u003ctd\u003eVerify tank, lines, pump function on injected units; confirm premix ratio on premix models.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eThermostat inspection\/replacement\u003c\/td\u003e\n        \u003ctd\u003eAnnually or if overheat\/idle issues occur\u003c\/td\u003e\n        \u003ctd\u003eReplace gasket and thermostat if corroded or sticking; confirm correct opening temp.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\"\u003eForce Outboard Parts\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:12px 0;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service Kits and essentials: \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling system (impellers and housings): \u003ca href=\"https:\/\/seasierra.com\/collections\/force-water-pump-repair-kits\"\u003eForce Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel system (filters): \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel pumps and diaphragms: \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\"\u003eFuel Pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition and electrical service: \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion protection: \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase seals and hardware: \u003ca href=\"https:\/\/seasierra.com\/collections\/force-lower-unit-seal-kits\"\u003eForce Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:12px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:980px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eWeak tell‑tale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect intake screens and thermostat; verify impeller and housing condition.\u003c\/td\u003e\n        \u003ctd\u003eWater pump kit, wear plate\/cup, thermostat, intake screen\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd\u003eReplace\/inspect fuel filters; check for stale fuel and plug condition; verify throttle linkage.\u003c\/td\u003e\n        \u003ctd\u003eFuel filter, spark plugs, fuel pump diaphragm, carb kits\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd\u003eConfirm choke\/enrichment operation; check spark on all cylinders; inspect idle mixture settings.\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, ignition components, carb gaskets\/needles\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eExcessive smoke (2‑stroke)\u003c\/td\u003e\n        \u003ctd\u003eVerify premix ratio or oil‑injection rate; check for stuck choke and correct plug heat range.\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, choke\/enrichment parts, oil lines\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise or metal in oil\u003c\/td\u003e\n        \u003ctd\u003eDrain and inspect gear lube; pressure\/vac test; check prop shaft for fishing line.\u003c\/td\u003e\n        \u003ctd\u003eLower unit seal kit, bearings, prop shaft seals, drain\/fill washers\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:12px 0;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome later Force engines, especially around the 120\/125HP range, share Mercury‑era gearcase and ignition components. Always confirm by model\/serial and, when possible, by comparing your existing impeller housing and seals to the new kit before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, replace the impeller every 2–3 seasons. Shorten the interval if you operate in sandy\/silty water, the tell‑tale weakens, or any overheat warning occurs.\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 gear oil every 100 hours or annually. If the lube appears milky or contains metal, perform a pressure\/vacuum test and reseal the gearcase before further use.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the full model and serial numbers, shaft length, control type, and clear photos of the nameplate and the part area (e.g., impeller housing or seal locations). This ensures you receive the correct kit on the first try.\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 shop? Browse the main Force collection by horsepower, year, and model to find parts that fit your engine.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/force-outboard-parts\" style=\"display:inline-block;padding:10px 14px;border:1px solid #1f4b99;border-radius:6px;text-decoration:none;\"\u003eShop Force Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#333;\"\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-seal-kit-fits-mercury-mariner-30-125-hp-replaces-26-43035a4","title":"Mercury Mariner Lower Unit Gearcase Seal Kit, 30–125 HP 2- and 4-Stroke, 3- and 4-Cylinder","description":"\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n  \u003ch2\u003eProduct Details\u003c\/h2\u003e\n  \u003cp\u003eThis \u003cstrong\u003elower unit gearcase seal kit\u003c\/strong\u003e is intended for Mercury and Mariner outboards rated from \u003cstrong\u003e30 to 125 HP\u003c\/strong\u003e with either 2-stroke or 4-stroke powerheads and 3- or 4-cylinder configurations. It is designed for lower unit and gearcase service where worn or damaged seals, gaskets, O-rings, and related sealing components need to be replaced.\u003c\/p\u003e\n  \u003cp\u003eThe kit is listed as an aftermarket replacement for the Mercury reference numbers \u003cstrong\u003e26-43035A1\u003c\/strong\u003e, \u003cstrong\u003e26-43035A2\u003c\/strong\u003e, \u003cstrong\u003e26-43035A3\u003c\/strong\u003e, \u003cstrong\u003e26-43035A4\u003c\/strong\u003e, and \u003cstrong\u003e26-43035A05\u003c\/strong\u003e. Confirm the complete engine model and serial-number range before ordering because lower-unit components can vary by gearcase design, gear ratio, and serial break.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eLower unit and gearcase seal kit for Mercury and Mariner outboards.\u003c\/li\u003e\n    \u003cli\u003eApplications covering 30–125 HP, 2-stroke and 4-stroke, 3- and 4-cylinder configurations.\u003c\/li\u003e\n    \u003cli\u003eSupports gearcase resealing during lower-unit repair or maintenance.\u003c\/li\u003e\n    \u003cli\u003eAftermarket replacement; not manufactured or branded by Mercury Marine.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n  \u003cp\u003eThese references are provided for identification and cross-reference purposes. They do not replace verification against the exact engine model and serial number.\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 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\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e26-43035A1\u003c\/td\u003e\n          \u003ctd\u003eManufacturer reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e26-43035A2\u003c\/td\u003e\n          \u003ctd\u003eManufacturer reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e26-43035A3\u003c\/td\u003e\n          \u003ctd\u003eManufacturer reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e26-43035A4\u003c\/td\u003e\n          \u003ctd\u003eManufacturer reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury\u003c\/td\u003e\n          \u003ctd\u003e26-43035A05\u003c\/td\u003e\n          \u003ctd\u003eManufacturer reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eSierra\u003c\/td\u003e\n          \u003ctd\u003e18-2626\u003c\/td\u003e\n          \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eGLM\u003c\/td\u003e\n          \u003ctd\u003e87590\u003c\/td\u003e\n          \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMallory\u003c\/td\u003e\n          \u003ctd\u003e9-74200\u003c\/td\u003e\n          \u003ctd\u003eAftermarket cross-reference\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eEngine and Model Compatibility\u003c\/h2\u003e\n  \u003cp\u003eThe company fitment range for this product is Mercury and Mariner outboards rated \u003cstrong\u003e30–125 HP\u003c\/strong\u003e, covering both \u003cstrong\u003e2-stroke and 4-stroke\u003c\/strong\u003e engines with \u003cstrong\u003e3- or 4-cylinder\u003c\/strong\u003e configurations.\u003c\/p\u003e\n  \u003cp\u003eCatalog occurrences for the referenced gearcase seal application include selected Mercury 30 HP and 40 HP models, 4-stroke applications, Bigfoot gearcases, and gear housings with different serial-number breaks. These examples are not a complete fitment list. Always compare the engine model, horsepower, stroke, cylinder count, gearcase configuration, and serial number with the applicable service or parts catalog.\u003c\/p\u003e\n  \u003cdiv class=\"ss-table-wrap\"\u003e\n    \u003ctable class=\"ss-table\" aria-label=\"Mercury and Mariner Compatibility Summary\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eBrand\u003c\/th\u003e\n          \u003cth\u003eRated HP\u003c\/th\u003e\n          \u003cth\u003eStroke\u003c\/th\u003e\n          \u003cth\u003eCylinder Configuration\u003c\/th\u003e\n          \u003cth\u003eFitment Conditions\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n          \u003ctd\u003e30–125 HP\u003c\/td\u003e\n          \u003ctd\u003e2-stroke or 4-stroke\u003c\/td\u003e\n          \u003ctd\u003e3- or 4-cylinder\u003c\/td\u003e\n          \u003ctd\u003eVerify exact model, gearcase design, and serial-number range 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 horsepower range alone does not confirm fitment. Do not use this listing for a specific engine unless the applicable serial-number and gearcase conditions match.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003cdl\u003e\n    \u003cdt\u003eProduct Type\u003c\/dt\u003e\n    \u003cdd\u003eLower unit and gearcase seal kit\u003c\/dd\u003e\n    \u003cdt\u003eCompatible Brands\u003c\/dt\u003e\n    \u003cdd\u003eMercury and Mariner\u003c\/dd\u003e\n    \u003cdt\u003eRated Horsepower Range\u003c\/dt\u003e\n    \u003cdd\u003e30–125 HP\u003c\/dd\u003e\n    \u003cdt\u003eEngine Stroke\u003c\/dt\u003e\n    \u003cdd\u003e2-stroke and 4-stroke applications\u003c\/dd\u003e\n    \u003cdt\u003eCylinder Configuration\u003c\/dt\u003e\n    \u003cdd\u003e3- and 4-cylinder applications\u003c\/dd\u003e\n    \u003cdt\u003eReplacement Type\u003c\/dt\u003e\n    \u003cdd\u003eAftermarket replacement\u003c\/dd\u003e\n  \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eOne lower unit and gearcase seal kit.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eIndividual seal, gasket, O-ring, and washer quantities can vary by application and kit configuration. Compare the kit contents with the parts diagram for your exact engine before installation.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003col\u003e\n    \u003cli\u003eObtain the correct service manual for the exact outboard model and serial-number range.\u003c\/li\u003e\n    \u003cli\u003eDisconnect the battery and place the engine in neutral before beginning work.\u003c\/li\u003e\n    \u003cli\u003eDrain the gearcase lubricant through the designated drain and vent openings 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 the gearcase only as necessary to access the seals and gaskets being replaced.\u003c\/li\u003e\n    \u003cli\u003eClean mating surfaces and seal bores thoroughly. Do not damage machined surfaces during seal removal.\u003c\/li\u003e\n    \u003cli\u003eInstall each replacement seal, gasket, O-ring, and washer in the correct location and orientation. Use the lubricant or sealant specified by the service manual.\u003c\/li\u003e\n    \u003cli\u003eReassemble the gearcase and reinstall the lower unit using the manufacturer’s torque specifications.\u003c\/li\u003e\n    \u003cli\u003eRefill the gearcase with the recommended marine gear lubricant using the correct fill procedure.\u003c\/li\u003e\n    \u003cli\u003ePressure- or vacuum-test the gearcase when the service procedure requires it, then check for leaks before returning the engine to service.\u003c\/li\u003e\n  \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eTroubleshooting and FAQ\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I confirm this seal kit fits my outboard?\u003c\/summary\u003e\n    \u003cp\u003eConfirm that your engine is a Mercury or Mariner model in the 30–125 HP range with a 2-stroke or 4-stroke, 3- or 4-cylinder configuration. Then verify the exact model, gearcase design, and serial-number range against the applicable parts diagram. The reference numbers alone should not be used as the only fitment check.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat are common signs of lower-unit seal failure?\u003c\/summary\u003e\n    \u003cp\u003ePossible signs include milky or cloudy gear lubricant, water in the gearcase, lubricant leaking near the propeller shaft or driveshaft, or lubricant loss during operation. Inspect the gearcase before replacing parts because damage to shafts, bearing carriers, or sealing surfaces can also cause leaks.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan this kit be used for every Mercury or Mariner engine from 30 to 125 HP?\u003c\/summary\u003e\n    \u003cp\u003eNo. The stated horsepower range is a broad application range, not a guarantee for every model. Serial-number breaks, gearcase design, gear ratio, stroke, cylinder configuration, and regional model differences may affect fitment.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an OEM Mercury component?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is an aftermarket replacement seal kit that references the listed Mercury manufacturer part numbers for identification and application matching.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre special tools required?\u003c\/summary\u003e\n    \u003cp\u003eDepending on the gearcase, installation may require seal drivers, bearing or carrier removal tools, a torque wrench, and a pressure\/vacuum tester. Use the service manual for the exact engine and gearcase before starting work.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat lubricant should be used after installation?\u003c\/summary\u003e\n    \u003cp\u003eUse the marine gear lubricant specified for your exact outboard by the engine manufacturer. Follow the service manual for lubricant grade, fill quantity, and filling sequence.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eSafety and Important Information\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify the full engine model, stroke, cylinder configuration, gearcase type, and serial number before ordering.\u003c\/li\u003e\n    \u003cli\u003eDo not rely on horsepower or a single reference number to confirm fitment.\u003c\/li\u003e\n    \u003cli\u003eCompare the original components and applicable parts diagram before disassembly.\u003c\/li\u003e\n    \u003cli\u003eFollow the manufacturer’s service procedures, torque specifications, sealant requirements, and lubricant specifications.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended for gearcase disassembly, sealing, and pressure testing.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n  \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eMarine replacement parts selected for practical repair and maintenance applications.\u003c\/li\u003e\n    \u003cli\u003eClear cross-reference information to help identify the correct replacement component.\u003c\/li\u003e\n    \u003cli\u003eSupport focused on accurate application matching and dependable service-part sourcing.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723965993275,"sku":"23SK480","price":86.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Lower_Unit_Gearcase_Seal_Kit_for_Mercury_Mariner_Outboard_30-125_HP_Motor__26-43035A4_-_JLM_MARINE-8287879.webp?v=1763038616"}],"url":"https:\/\/seasierra.com\/collections\/force-2-stroke-outboard-engine-50-125hp-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}