{"product_id":"gearcase-seal-kit-fits-mercury-65hp-75hp-80hp-90hp-100hp-115hp-efi-replaces-8m0088081","title":"Gearcase Seal Kit – Fits Mercury 65HP 75HP 80HP 90HP 100HP 115HP EFI (Replaces 8M0088081)","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 \u003cstrong\u003eGearcase Seal Kit\u003c\/strong\u003e is designed for Mercury EFI outboards including 65HP, 75HP, 80HP, 90HP, 100HP, and 115HP models with serial numbers 2B095049 and up. It covers standard and counter-rotation configurations across Sea Pro, Pro XS, and JET variants, serving both driveshaft and propeller shaft gear housing assemblies with 2.38:1 ratio.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket kit directly replaces Mercury OEM part number 8M0088081, delivering the same fit and function at a competitive price.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with both standard and counter-rotation gear housings\u003c\/li\u003e\n  \u003cli\u003eFits driveshaft and propeller shaft assemblies\u003c\/li\u003e\n  \u003cli\u003eDesigned for EFI outboard applications\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\u003e8M0088081\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\u003eHP\u003c\/th\u003e\n        \u003cth\u003eSerial Number\u003c\/th\u003e\n        \u003cth\u003eComponent\u003c\/th\u003e\n        \u003cth\u003eRatio\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e115HP EFI Pro XS\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e2B225488 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e90HP EFI\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e100HP EFI\u003c\/td\u003e\n        \u003ctd\u003e100\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e75HP EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e65HP EFI JET\u003c\/td\u003e\n        \u003ctd\u003e65\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e80HP EFI\u003c\/td\u003e\n        \u003ctd\u003e80\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e90HP EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e80HP EFI JET\u003c\/td\u003e\n        \u003ctd\u003e80\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e115HP EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e115HP EFI\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e75HP EFI\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Driveshaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard\/Counter Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e100HP EFI\u003c\/td\u003e\n        \u003ctd\u003e100\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e75HP EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e90HP EFI\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e65HP EFI JET\u003c\/td\u003e\n        \u003ctd\u003e65\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e80HP EFI\u003c\/td\u003e\n        \u003ctd\u003e80\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e115HP EFI Pro XS\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e2B225488 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e80HP EFI JET\u003c\/td\u003e\n        \u003ctd\u003e80\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e115HP EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e90HP EFI Sea Pro\u003c\/td\u003e\n        \u003ctd\u003e90\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e115HP EFI\u003c\/td\u003e\n        \u003ctd\u003e115\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 Standard Rotation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Outboard\u003c\/td\u003e\n        \u003ctd\u003e75HP EFI\u003c\/td\u003e\n        \u003ctd\u003e75\u003c\/td\u003e\n        \u003ctd\u003e2B095049 \u0026amp; Up\u003c\/td\u003e\n        \u003ctd\u003eGear Housing, Propeller Shaft\u003c\/td\u003e\n        \u003ctd\u003e2.38:1 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\u003e8M0088081\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eGearcase assembly (driveshaft and propeller shaft)\u003c\/dd\u003e\n  \u003cdt\u003eGear Ratio\u003c\/dt\u003e\n  \u003cdd\u003e2.38:1\u003c\/dd\u003e\n  \u003cdt\u003eRotation Type\u003c\/dt\u003e\n  \u003cdd\u003eStandard and Counter-Rotation\u003c\/dd\u003e\n  \u003cdt\u003eCompatibility\u003c\/dt\u003e\n  \u003cdd\u003eMercury EFI outboards 65–115 HP\u003c\/dd\u003e\n  \u003cdt\u003eSerial Number Range\u003c\/dt\u003e\n  \u003cdd\u003e2B095049 \u0026amp; Up (most models); 2B225488 \u0026amp; Up (Pro XS)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete gearcase seal kit with all required seals and gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and relieve all fuel pressure before beginning work.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit from the outboard following manufacturer procedures.\u003c\/li\u003e\n  \u003cli\u003eDrain all gear oil and inspect for metal shavings or contamination.\u003c\/li\u003e\n  \u003cli\u003eRemove the propeller shaft and driveshaft carefully, noting orientation and sequence.\u003c\/li\u003e\n  \u003cli\u003eClean all mating surfaces thoroughly, removing old seal material and residue.\u003c\/li\u003e\n  \u003cli\u003eInstall new seals from the kit in the correct orientation, lubricating with gear oil as needed.\u003c\/li\u003e\n  \u003cli\u003eReassemble the driveshaft and propeller shaft components in reverse order.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit onto the outboard and torque all fasteners to specification.\u003c\/li\u003e\n  \u003cli\u003eRefill with the correct grade and quantity of marine gear oil.\u003c\/li\u003e\n  \u003cli\u003eCheck for leaks after initial run and recheck oil level after first operating cycle.\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 oil indicating water intrusion, unusual whining or grinding noises from the gearcase, or visible oil residue around seals and shaft housings.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWill this kit fit both standard and counter-rotation models?\u003c\/summary\u003e\n  \u003cp\u003eYes, this seal kit is compatible with both standard and counter-rotation gear housings on the listed Mercury EFI outboards with the 2.38:1 ratio.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDo I need any special tools to install this seal kit?\u003c\/summary\u003e\n  \u003cp\u003eBasic hand tools are required, along with a seal driver or appropriately sized socket for pressing seals into place. A torque wrench and the manufacturer's service manual are highly recommended for proper reassembly.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse old seals if they look okay?\u003c\/summary\u003e\n  \u003cp\u003eNo. Seals are single-use components that compress and conform to their mating surfaces. Reusing old seals risks leaks and water contamination, which can cause catastrophic gearcase damage.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat type of gear oil should I use after installation?\u003c\/summary\u003e\n  \u003cp\u003eUse Mercury Premium or High Performance Gear Lube as specified in your owner's manual. Consult your engine's documentation for the correct viscosity and capacity.\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, or immediately if you notice leaks or water contamination. Routine inspection every 100 hours or annually is recommended.\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":51025603854651,"sku":"21KM006","price":66.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_976902d5-4b96-4112-9b58-1f1121cb10ec.jpg?v=1772927979","url":"https:\/\/seasierra.com\/products\/gearcase-seal-kit-fits-mercury-65hp-75hp-80hp-90hp-100hp-115hp-efi-replaces-8m0088081","provider":"SeaSierra","version":"1.0","type":"link"}