{"product_id":"8m0090558-maintenance-kit-for-mercury-40-60-efi-4-cylinder-jlm-marine","title":"8M0090558 Maintenance Kit for Mercury 40-60 EFI 4 Cylinder | JLM Marine","description":"\u003ch2\u003e8M0090558 Maintenance Kit for Mercury 40-60 EFI 4 Cylinder\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive maintenance kit is specifically designed for \u003cstrong\u003eMercury 40-60 EFI 4 Cylinder\u003c\/strong\u003e outboard engines. It provides all the essential components needed for routine servicing, ensuring your engine runs at peak performance and reliability.\u003c\/p\u003e\n\n\u003cp\u003eThis kit serves as a direct replacement for OEM part number \u003cstrong\u003e8M0090558\u003c\/strong\u003e, delivering quality components that meet or exceed original equipment specifications.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete maintenance solution with filters, thermostat, gaskets, and gear oil pump\u003c\/li\u003e\n\u003cli\u003eIncludes all critical wear items for comprehensive engine service\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for Mercury EFI 4-cylinder powerheads\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\u003c\/td\u003e\n\u003ctd\u003e8M0090558\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\" target=\"_blank\" rel=\"nofollow noopener\"\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\" target=\"_blank\" rel=\"nofollow noopener\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\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\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e40-60 EFI 4 Cylinder\u003c\/td\u003e\n\u003ctd\u003e40-60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\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\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e8M0090558\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMercury 40-60 EFI 4 Cylinder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Type\u003c\/td\u003e\n\u003ctd\u003eMaintenance Kit\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\u003e8M0117413 (Thermostat) x1\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e824853 (Gasket) x1\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e35-879884T (Fuel filter) x1\u003c\/strong\u003e \u003ca href=\"https:\/\/jlmmarine.com\/products\/cartridge-fuel-filter-for-mercury-mariner-30-40-50-60-hp-879884t\" target=\"_blank\"\u003eView Part →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e35-8M0153652 (Fuel filter) x1\u003c\/strong\u003e \u003ca href=\"https:\/\/jlmmarine.com\/products\/in-line-fuel-filter-for-mercury-efi-30-350-hp\" target=\"_blank\"\u003eView Part →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e35-8M0162829 (Oil filter) x1\u003c\/strong\u003e\u003c\/span\u003e \u003ca href=\"https:\/\/jlmmarine.com\/products\/oil-filter-for-mercury-25-115-hp-18-7914\" target=\"_blank\"\u003eView Part →\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e8M007119 (Drain Gasket) x1\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e830749 (Drain Gasket) x3\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e24OP149 (Gear Oil Pump) x1\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eEnsure the engine is off and cool before beginning any maintenance work. Gather all tools and components from the kit.\u003c\/li\u003e\n\u003cli\u003eLocate and remove the old oil filter using an appropriate filter wrench. Install the new oil filter (35-8M0162829) hand-tight, adding a thin film of oil to the gasket.\u003c\/li\u003e\n\u003cli\u003eDrain the engine oil and remove the drain plug. Replace the drain gasket (8M007119) with a new one from the kit before reinstalling the plug.\u003c\/li\u003e\n\u003cli\u003eAccess the thermostat housing and remove the old thermostat. Install the new thermostat (8M0117413) with the included gasket (824853), ensuring proper orientation.\u003c\/li\u003e\n\u003cli\u003eLocate the fuel filter assembly and disconnect fuel lines carefully. Replace both fuel filters (35-879884T and 35-8M0153652) according to their respective positions.\u003c\/li\u003e\n\u003cli\u003eDrain the lower unit gear oil by removing both drain and fill plugs. Inspect the old oil for metal particles or water contamination.\u003c\/li\u003e\n\u003cli\u003eUse the gear oil pump (24OP149) to refill the lower unit from the bottom drain hole until oil appears at the top fill hole. Install drain gaskets (830749) on both plugs.\u003c\/li\u003e\n\u003cli\u003eDouble-check all filter installations, gasket seals, and plug torque specifications. Refill engine oil to the proper level per manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eStart the engine and allow it to reach operating temperature. Check for leaks around all serviced components.\u003c\/li\u003e\n\u003cli\u003eShut down the engine and recheck fluid levels after it has cooled. Top off oil if necessary.\u003c\/li\u003e\n\u003cli\u003eInspect the work area and ensure all old parts are disposed of properly. Record the maintenance date and engine hours in your service log.\u003c\/li\u003e\n\u003cli\u003eTest run the engine under normal operating conditions and monitor performance. Address any unusual sounds or leaks immediately.\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 specifically for Mercury 40-60 HP EFI 4-cylinder engines. Verify your engine model using the serial number guide linked above, or check your engine's specifications plate to confirm compatibility before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I perform maintenance using this kit?\u003c\/strong\u003e\u003cbr\u003e\nA: Mercury recommends performing routine maintenance every 100 hours of operation or annually, whichever comes first. In harsh operating conditions (saltwater, heavy use), more frequent service intervals may be necessary.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this kit myself or do I need a professional?\u003c\/strong\u003e\u003cbr\u003e\nA: While experienced mechanics can perform this maintenance, professional installation is recommended to ensure proper procedure, torque specifications, and warranty protection, especially if you're unfamiliar with outboard service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that I need to replace these maintenance items?\u003c\/strong\u003e\u003cbr\u003e\nA: Common indicators include poor fuel economy, rough idling, overheating, difficulty shifting gears, milky gear oil (water contamination), or decreased engine performance. Regular preventive maintenance prevents these issues.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit include engine oil and gear oil fluids?\u003c\/strong\u003e\u003cbr\u003e\nA: No, this kit includes filters, gaskets, thermostat, and a gear oil pump for refilling, but does not include the actual engine oil or gear oil fluids. You will need to purchase appropriate Mercury-spec lubricants separately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket?\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":52418283897145,"sku":"23KM779-4N","price":68.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/kit-23KM779-4N_4fbf88f1-c218-4140-9461-95da46985d11.png?v=1776686817","url":"https:\/\/jlmmarine.com\/es\/products\/8m0090558-maintenance-kit-for-mercury-40-60-efi-4-cylinder-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}