{"product_id":"gearcase-seal-kit-fits-mercury-65hp-75hp-80hp-90hp-100hp-115hp-replaces-8m0088080","title":"Gearcase Seal Kit – Fits Mercury 65HP 75HP 80HP 90HP 100HP 115HP (Replaces 8M0088080)","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;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis Gearcase Seal Kit – Fits Mercury 65HP 75HP 80HP 90HP 100HP 115HP (Replaces 8M0088080) is designed for Mercury outboard engines from 65HP to 115HP EFI models, including standard, Sea Pro, Pro XS, and JET variants with serial numbers 2B095049 \u0026amp; Up (2B225488 \u0026amp; Up for 115HP Pro XS). The kit services both gear housing driveshaft and propeller shaft assemblies with 2.07:1 standard rotation gearcase configurations.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket seal kit directly replaces Mercury OEM part number 8M0088080, providing an exact-fit alternative for lower unit maintenance and repair.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with EFI, Sea Pro, Pro XS, and JET engine variants\u003c\/li\u003e\n  \u003cli\u003eServices both driveshaft and propeller shaft gear housing assemblies\u003c\/li\u003e\n  \u003cli\u003eEngineered for 2.07:1 standard rotation gearcases\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eNotes\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\u003e8M0088080\u003c\/td\u003e\n        \u003ctd\u003eOEM reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eSerial Number\u003c\/th\u003e\n        \u003cth\u003eComponent\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\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e100HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e90HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e75HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI JET\u003c\/td\u003e\n        \u003ctd\u003e65HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Pro XS\u003c\/td\u003e\n        \u003ctd\u003e115HP\u003c\/td\u003e\n        \u003ctd\u003e2B225488 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e80HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI JET\u003c\/td\u003e\n        \u003ctd\u003e80HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e115HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e90HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e115HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e75HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e90HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e75HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e100HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI JET\u003c\/td\u003e\n        \u003ctd\u003e65HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e80HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Pro XS\u003c\/td\u003e\n        \u003ctd\u003e115HP\u003c\/td\u003e\n        \u003ctd\u003e2B225488 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e90HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI JET\u003c\/td\u003e\n        \u003ctd\u003e80HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e115HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e115HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eOutboard EFI\u003c\/td\u003e\n        \u003ctd\u003e75HP\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.07:1 Standard Rotation\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\u003eOEM Part Number\u003c\/dt\u003e\n  \u003cdd\u003e8M0088080\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eGearcase seal kit for gear housing driveshaft and propeller shaft assemblies\u003c\/dd\u003e\n  \u003cdt\u003eGear Ratio\u003c\/dt\u003e\n  \u003cdd\u003e2.07:1 Standard Rotation\u003c\/dd\u003e\n  \u003cdt\u003eCompatibility\u003c\/dt\u003e\n  \u003cdd\u003eMercury 65HP, 75HP, 80HP, 90HP, 100HP, 115HP EFI outboards\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eGearcase Seal Kit (complete set)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect battery and remove propeller before beginning service.\u003c\/li\u003e\n  \u003cli\u003eDrain gear oil completely and inspect for metal shavings or contamination.\u003c\/li\u003e\n  \u003cli\u003eRemove lower unit from engine following manufacturer's service manual procedures.\u003c\/li\u003e\n  \u003cli\u003eDisassemble gearcase housing and remove old seals from driveshaft and propeller shaft assemblies.\u003c\/li\u003e\n  \u003cli\u003eClean all seal mating surfaces thoroughly, removing residue and corrosion.\u003c\/li\u003e\n  \u003cli\u003eLubricate new seals with marine-grade gear oil before installation.\u003c\/li\u003e\n  \u003cli\u003eInstall new seals carefully, ensuring proper orientation and seating without damage.\u003c\/li\u003e\n  \u003cli\u003eReassemble gearcase components per torque specifications in service manual.\u003c\/li\u003e\n  \u003cli\u003eReattach lower unit to engine, verifying all fasteners and shift linkages are secure.\u003c\/li\u003e\n  \u003cli\u003eRefill gearcase with recommended gear oil to proper level through fill plug.\u003c\/li\u003e\n  \u003cli\u003eReinstall propeller and test shift operation before launching.\u003c\/li\u003e\n  \u003cli\u003eMonitor for leaks during initial operation and re-check oil level after first use.\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 need replacement?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include gear oil leaking from the lower unit, milky or contaminated gear oil indicating water intrusion, or visible oil around the propeller shaft. Regular inspection during seasonal maintenance is recommended.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this kit work on both driveshaft and propeller shaft assemblies?\u003c\/summary\u003e\n  \u003cp\u003eYes, this seal kit is designed to service both the gear housing driveshaft and propeller shaft components on compatible Mercury outboard models with 2.07:1 standard rotation gearcases.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat tools are required for installation?\u003c\/summary\u003e\n  \u003cp\u003eBasic lower unit removal tools, seal installation drivers or appropriate sockets, torque wrench, gear oil pump, and your engine's service manual. Special seal drivers help prevent damage during installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should gearcase seals be replaced?\u003c\/summary\u003e\n  \u003cp\u003eReplace seals whenever the lower unit is disassembled for service, if leaks are detected, or as preventive maintenance every 3–5 years depending on usage and operating conditions. Saltwater environments may require more frequent inspection.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I use this on a counter-rotation gearcase?\u003c\/summary\u003e\n  \u003cp\u003eThis kit is specified for 2.07:1 standard rotation gearcases. Verify your gearcase rotation type and ratio before ordering to ensure proper fitment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat type of gear oil should I use after seal replacement?\u003c\/summary\u003e\n  \u003cp\u003eUse Mercury Premium or High-Performance Gear Lube as specified in your owner's manual. Proper oil viscosity and type are critical for seal longevity and gearcase protection.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025603756347,"sku":"21KM005","price":62.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_8db20264-a411-466e-8c1d-ff9c445e2a55.jpg?v=1772927978","url":"https:\/\/seasierra.com\/products\/gearcase-seal-kit-fits-mercury-65hp-75hp-80hp-90hp-100hp-115hp-replaces-8m0088080","provider":"SeaSierra","version":"1.0","type":"link"}