{"product_id":"8m0120867-maintenance-kit-for-mercury-mariner-8hp-9-9hp-command-thrust-efi-jlm-marine","title":"8M0120867 Maintenance Kit for Mercury Mariner 8HP 9.9HP Command Thrust EFI | JLM Marine","description":"\u003ch2\u003eMaintenance Kit for Mercury Mariner 8HP 9.9HP Command Thrust EFI\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive maintenance kit is specifically designed for \u003cstrong\u003eMercury Mariner 8HP and 9.9HP Command Thrust EFI outboard motors\u003c\/strong\u003e (serial number 0R042475 and above). It includes all essential components to perform routine maintenance and ensure your engine runs at peak performance.\u003c\/p\u003e\n\n\u003cp\u003eThis kit serves as a direct replacement for OEM part numbers \u003cstrong\u003e8M0120867\u003c\/strong\u003e, \u003cstrong\u003e8M0120838\u003c\/strong\u003e, \u003cstrong\u003e3SA-87500-0\u003c\/strong\u003e, and \u003cstrong\u003e3RS-87500-0\u003c\/strong\u003e, providing a complete service solution in one convenient package.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eIncludes water pump impeller, thermostat, fuel filter, oil filter, and gaskets\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for Command Thrust EFI models\u003c\/li\u003e\n\u003cli\u003eComplete maintenance solution for routine service intervals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\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\u003e8M0120867\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e8M0120838\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e3SA-87500-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e3RS-87500-0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\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\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury Mariner Quicksilver\u003c\/td\u003e\n\u003ctd\u003e8\/9.9 HP Command Thrust EFI\u003c\/td\u003e\n\u003ctd\u003e8HP \/ 9.9HP\u003c\/td\u003e\n\u003ctd\u003e0R042475 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Part Number\u003c\/td\u003e\n\u003ctd\u003e8M0120867\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMercury Mariner 8HP\/9.9HP Command Thrust EFI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSerial Number Range\u003c\/td\u003e\n\u003ctd\u003e0R042475 and above\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis maintenance kit includes the following components:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1× Water Pump Impeller\u003c\/strong\u003e (47-803748)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1× Key\u003c\/strong\u003e (8M0137347)\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1× Thermostat\u003c\/strong\u003e (8M0119207)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1× Thermostat Gasket\u003c\/strong\u003e (27-8M0214960)\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1× Fuel Filter\u003c\/strong\u003e (35-8M0157133)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1× Oil Filter\u003c\/strong\u003e (35-822626Q03)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1× Cotter Pin\u003c\/strong\u003e (951403-0310)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3× Drain Gaskets\u003c\/strong\u003e (12-895146 \u0026amp; 8M0075255)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreparation:\u003c\/strong\u003e Ensure the engine is off and cooled down completely. Gather all necessary tools including screwdrivers, wrenches, and a drain pan.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Change:\u003c\/strong\u003e Remove the old oil filter using an oil filter wrench and drain the engine oil into a suitable container. Install the new oil filter (35-822626Q03) and replace drain gaskets before refilling with fresh oil.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Filter Replacement:\u003c\/strong\u003e Locate the fuel filter and disconnect fuel lines carefully. Replace with the new fuel filter (35-8M0157133) and ensure all connections are secure to prevent leaks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Pump Service:\u003c\/strong\u003e Remove the lower unit to access the water pump housing. Carefully remove the old impeller and install the new impeller (47-803748) along with the key (8M0137347), ensuring proper orientation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat Replacement:\u003c\/strong\u003e Remove the thermostat housing cover and take out the old thermostat. Install the new thermostat (8M0119207) with the new gasket (27-8M0214960) and torque the housing bolts to specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal Assembly:\u003c\/strong\u003e Reinstall the lower unit, secure the cotter pin, and double-check all fasteners. Refill fluids to proper levels and run the engine to verify proper operation and check for leaks.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this maintenance kit fits my Mercury engine?\u003c\/strong\u003e\u003cbr\u003e\nA: This kit is designed exclusively for Mercury Mariner 8HP and 9.9HP Command Thrust EFI models with serial number 0R042475 and above. Check your engine's serial number plate or consult the Mercury serial number guide linked above to verify compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I perform maintenance with this kit?\u003c\/strong\u003e\u003cbr\u003e\nA: Mercury recommends performing routine maintenance every 100 hours of operation or annually, whichever comes first. For harsh operating conditions (saltwater, heavy use), consider more frequent service intervals to ensure optimal performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this maintenance kit myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: While experienced boat owners with mechanical skills can perform this maintenance, professional installation is recommended to ensure proper torque specifications, impeller orientation, and leak-free assembly. Improper installation can lead to engine damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are signs that my water pump impeller needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include weak water stream from the tell-tale, engine overheating, reduced cooling system performance, or visible damage to the impeller blades. Regular inspection and replacement prevent costly engine damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981001425209,"sku":"23KM773","price":37.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_23b71dad-835c-4385-b549-91b6de016972.jpg?v=1772414238","url":"https:\/\/jlmmarine.com\/es\/products\/8m0120867-maintenance-kit-for-mercury-mariner-8hp-9-9hp-command-thrust-efi-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}