{"product_id":"8m0251125-maintenance-kit-for-mercury-30hp-40hp-jlm-marine","title":"8M0251125 Maintenance Kit for Mercury 30HP 40HP | JLM Marine","description":"\u003ch2\u003e8M0251125 Maintenance Kit for Mercury 30HP 40HP | JLM Marine\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive maintenance kit is specifically designed for \u003cstrong\u003eMercury 30-40HP 2-Cylinder USA-made outboard engines manufactured between 1995 and 2007\u003c\/strong\u003e (suits serial numbers starting with \u003cstrong\u003e0G, 0T, 1B, or 0P\u003c\/strong\u003e). It includes all essential components needed for a complete service—from water pump parts to fuel filters and gear oil pump—ensuring your engine runs smoothly and reliably season after season.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket kit directly replaces Mercury OEM part number \u003cstrong\u003e8M0251125\u003c\/strong\u003e, providing a cost-effective solution without compromising on quality. Each component is manufactured to OEM specifications, offering dependable performance and extended service intervals.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIncludes water pump impeller, wear plate, gaskets, thermostat, fuel filters, and gear oil pump\u003c\/li\u003e\n  \u003cli\u003eComplete service solution for routine maintenance in a single kit\u003c\/li\u003e\n  \u003cli\u003eDesigned for 2-cylinder Mercury engines with specific serial number ranges\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\"\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\u003e8M0251125\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\"\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\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\u003e2 Cylinder USA made\u003c\/td\u003e\n      \u003ctd\u003e30-40HP\u003c\/td\u003e\n      \u003ctd\u003e1995-2007 (Suits serial # starting with 0G, 0T, 1B or 0P)\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\"\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\u003e8M0251125\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFits Engine HP\u003c\/td\u003e\n      \u003ctd\u003e30-40HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCylinder Configuration\u003c\/td\u003e\n      \u003ctd\u003e2 Cylinder\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplicable Years\u003c\/td\u003e\n      \u003ctd\u003e1995-2007\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSerial Number Range\u003c\/td\u003e\n      \u003ctd\u003eStarting with 0G, 0T, 1B, or 0P\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\n\u003cstrong\u003e47-85089-10\u003c\/strong\u003e Water Pump Impeller × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8M0032838 85119\u003c\/strong\u003e Impeller Key × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e821354-2\u003c\/strong\u003e Wear Plate × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e27-822189\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e27-822217\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12-86645-1\u003c\/strong\u003e Washer × 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e823547 1\u003c\/strong\u003e Water Tube × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e43023\u003c\/strong\u003e Water Tube × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e14586\u003c\/strong\u003e Thermostat × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e27-812867 2\u003c\/strong\u003e Thermostat Gasket × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e35-87946Q3\u003c\/strong\u003e Fuel Filter × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e35-879885T\u003c\/strong\u003e Fuel Filter × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12-191833\u003c\/strong\u003e Drain Screw Gasket × 3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e27-828816\u003c\/strong\u003e Oil Drain Screw Gasket × 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e24OP149\u003c\/strong\u003e Gear Oil Pump × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Verify all components against your engine's service manual before installation to ensure proper fitment.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePreparation:\u003c\/strong\u003e Disconnect the fuel line and remove the lower unit from the engine. Ensure the engine is cool and stabilized on a work stand.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrain Fluids:\u003c\/strong\u003e Use the provided drain screw gaskets to remove and replace old gearcase oil. Dispose of fluids according to local regulations.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove Water Pump Housing:\u003c\/strong\u003e Unscrew the water pump housing bolts and carefully lift off the housing. Inspect for corrosion or damage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplace Impeller:\u003c\/strong\u003e Remove the old impeller using the impeller key, then install the new impeller (47-85089-10) ensuring blades face the correct direction.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstall Wear Plate:\u003c\/strong\u003e Position the new wear plate (821354-2) on top of the impeller. Ensure it sits flush and aligns with mounting holes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplace Gaskets:\u003c\/strong\u003e Install new gaskets (27-822189 and 27-822217) on the housing and base plate. Apply a thin layer of marine grease for easier assembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstall Water Tubes:\u003c\/strong\u003e Insert the water tubes (823547 1 and 43023) into their respective ports, ensuring secure seating without kinks.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplace Thermostat:\u003c\/strong\u003e Remove the old thermostat housing, install the new thermostat (14586) with its gasket (27-812867 2), and tighten bolts evenly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstall Fuel Filters:\u003c\/strong\u003e Replace both fuel filters (35-87946Q3 and 35-879885T) in the fuel line. Ensure O-rings are properly seated to prevent leaks.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReassemble Water Pump Housing:\u003c\/strong\u003e Carefully position the housing back onto the lower unit and torque bolts to manufacturer specifications in a cross pattern.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRefill Gearcase Oil:\u003c\/strong\u003e Use the gear oil pump (24OP149) to refill the lower unit with fresh gear oil until it flows from the upper vent hole.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinal Check:\u003c\/strong\u003e Reconnect the fuel line, reattach the lower unit, and run the engine in a test tank to verify proper water flow and operation.\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 kit fits my Mercury outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine is a 30-40HP 2-cylinder USA-made model from 1995-2007 with a serial number starting with 0G, 0T, 1B, or 0P. Cross-reference your engine's serial number using the Mercury Serial Number Guide linked above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I perform this maintenance service?\u003c\/strong\u003e\u003cbr\u003e\nA: Mercury recommends replacing the water pump impeller and related components annually or every 100 hours of operation, whichever comes first. Fuel filters and thermostats should be inspected and replaced as needed during routine service.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are signs my water pump impeller needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include reduced water flow from the tell-tale indicator, engine overheating, steam from the engine cover, or visible damage to impeller blades during inspection. Never run the engine dry, as this accelerates impeller wear.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this kit if my engine serial number doesn't match the specified range?\u003c\/strong\u003e\u003cbr\u003e\nA: No, this kit is engineered specifically for engines with serial numbers starting with 0G, 0T, 1B, or 0P. Using incompatible parts may result in improper fitment, reduced performance, or engine damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between this aftermarket kit and the OEM version?\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":52418308833593,"sku":"25KM198-2N","price":68.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/kit-25KM198-2N_dabab56d-310c-4f0d-942d-a467765742a0.png?v=1776686835","url":"https:\/\/jlmmarine.com\/ru\/products\/8m0251125-maintenance-kit-for-mercury-30hp-40hp-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}