{"product_id":"8m0251133-water-pump-impeller-kit-for-mercury-30hp-40hp-jlm-marine","title":"8M0251133 Water Pump Impeller Kit for Mercury 30HP 40HP | JLM Marine","description":"\u003ch2\u003e8M0251133 Water Pump Impeller Kit for Mercury 30HP 40HP | JLM Marine\u003c\/h2\u003e\n\n\u003cp\u003eThis comprehensive water pump impeller kit is engineered to fit Mercury 30HP and 40HP 3-cylinder carbureted outboard engines with 2:1 gear ratio configurations. Designed for models with short shaft and standard gearboxes, this kit ensures reliable cooling system performance across a wide range of serial numbers from 0G231123 through 1C018825.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket replacement kit directly replaces OEM part number \u003cstrong\u003e8M0251133\u003c\/strong\u003e and provides a complete service solution including the impeller, gaskets, wear plate, thermostat, fuel filters, oil filter, and gear oil pump—everything needed for a thorough cooling system and maintenance service.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete 16-piece kit with impeller, thermostat, fuel filters, oil filter, and gear oil pump\u003c\/li\u003e\n\u003cli\u003eFits Mercury 30HP and 40HP 3-cylinder carbureted models with 2:1 ratio gearboxes\u003c\/li\u003e\n\u003cli\u003eIncludes all necessary gaskets, wear plate, and water tubes for proper installation\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\u003e8M0251133\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\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\u003cth\u003eEngine Type\u003c\/th\u003e\n\u003cth\u003eSerial Number Range\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\u003e3-Cylinder Carbureted\u003c\/td\u003e\n\u003ctd\u003e40HP\u003c\/td\u003e\n\u003ctd\u003e3cyl Carb\u003c\/td\u003e\n\u003ctd\u003e1B227000-1B344306, 1C000001-1C018825\u003c\/td\u003e\n\u003ctd\u003eShort Shaft, 2:1 Ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e3-Cylinder Carbureted\u003c\/td\u003e\n\u003ctd\u003e40HP\u003c\/td\u003e\n\u003ctd\u003e3cyl Carb\u003c\/td\u003e\n\u003ctd\u003e0P401000 \u0026amp; Up, 0T409000-1B2266999\u003c\/td\u003e\n\u003ctd\u003e2:1 Ratio, Short Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e3-Cylinder Carbureted\u003c\/td\u003e\n\u003ctd\u003e40HP\u003c\/td\u003e\n\u003ctd\u003e3cyl Carb\u003c\/td\u003e\n\u003ctd\u003e0G231123-0P400999\u003c\/td\u003e\n\u003ctd\u003eAll Standard Gearboxes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e3-Cylinder\u003c\/td\u003e\n\u003ctd\u003e30HP\u003c\/td\u003e\n\u003ctd\u003e3cyl\u003c\/td\u003e\n\u003ctd\u003eAll Models\u003c\/td\u003e\n\u003ctd\u003eGear Box Ratio 2:1\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\u003e8M0251133\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible HP Range\u003c\/td\u003e\n\u003ctd\u003e30HP, 40HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Configuration\u003c\/td\u003e\n\u003ctd\u003e3-Cylinder Carbureted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGear Ratio\u003c\/td\u003e\n\u003ctd\u003e2:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShaft Length\u003c\/td\u003e\n\u003ctd\u003eShort Shaft (select models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Components\u003c\/td\u003e\n\u003ctd\u003e16 pieces\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 comprehensive kit includes \u003cstrong\u003e16 components\u003c\/strong\u003e for complete cooling system service and routine maintenance:\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\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e825212T02\u003c\/strong\u003e Thermostat × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e27-8M0177107\u003c\/strong\u003e Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e35-877565T1\u003c\/strong\u003e Fuel Filter × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e35-8M0149607\u003c\/strong\u003e Fuel Filter × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e35-822626Q2\u003c\/strong\u003e Oil Filter × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M007119\u003c\/strong\u003e Drain Gasket × 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M0204693\u003c\/strong\u003e Drain Gasket × 2\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e24OP149\u003c\/strong\u003e Gear Oil Pump × 1\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the fuel line and remove the lower unit from the outboard motor following your engine's service manual procedures.\u003c\/li\u003e\n\u003cli\u003eRemove the water pump housing bolts and carefully separate the housing from the driveshaft assembly. Inspect the housing for cracks or damage.\u003c\/li\u003e\n\u003cli\u003eRemove the old impeller, impeller key, and wear plate from the pump housing. Clean all surfaces thoroughly, removing any debris or old gasket material.\u003c\/li\u003e\n\u003cli\u003eInstall the new wear plate into the pump housing, ensuring proper alignment with the mounting holes.\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller with glycerin or soapy water (never petroleum-based products). Insert the impeller key into the driveshaft slot.\u003c\/li\u003e\n\u003cli\u003eInstall the impeller onto the driveshaft, rotating the blades in the correct direction (typically clockwise when viewed from above). Ensure the impeller key seats properly.\u003c\/li\u003e\n\u003cli\u003eReplace the water tubes with the new ones provided (part numbers 823547 1 and 43023), checking for proper fit and no obstructions.\u003c\/li\u003e\n\u003cli\u003eInstall new gaskets (27-822189, 27-822217, and 27-8M0177107) on all mating surfaces. Do not reuse old gaskets.\u003c\/li\u003e\n\u003cli\u003eReplace the thermostat (825212T02) in its housing, ensuring the temperature-sensing element faces the correct direction per your service manual.\u003c\/li\u003e\n\u003cli\u003eReassemble the water pump housing to the lower unit using the washers (12-86645-1) and tighten bolts in a cross-pattern to manufacturer specifications.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit to the engine. Replace the fuel filters (35-877565T1 and 35-8M0149607) and oil filter (35-822626Q2) per your maintenance schedule.\u003c\/li\u003e\n\u003cli\u003eUse the gear oil pump (24OP149) and new drain gaskets (8M007119 and 8M0204693) to change the lower unit gear oil. Run the engine with water supply and check for proper cooling stream.\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 engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Check your engine's serial number plate and compare it to the compatible ranges listed above (0G231123 through 1C018825). This kit fits 30HP and 40HP 3-cylinder carbureted models with 2:1 gear ratio gearboxes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the water pump impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: Mercury recommends replacing the water pump impeller annually or every 300 hours of operation, whichever comes first. Replace immediately if you notice reduced cooling stream or overheating.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs my water pump impeller needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Warning signs include weak or absent cooling water stream from the indicator, engine overheating, steam from the engine, or reduced water pressure. Impeller blades may become cracked, broken, or worn over time.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use petroleum-based lubricants when installing the impeller?\u003c\/strong\u003e\u003cbr\u003e\nA: No, never use petroleum-based products on the impeller as they can damage the rubber. Use only glycerin, dish soap mixed with water, or dedicated impeller installation lubricant.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this kit include everything I need for a complete water pump service?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, this 16-piece kit includes the impeller, gaskets, wear plate, water tubes, thermostat, and even fuel filters, oil filter, and gear oil pump for comprehensive maintenance. You'll have all critical cooling system and service components in one package.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. 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":52418333704505,"sku":"25KM356","price":68.5,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/kit-25KM356_fbc9f2e9-5011-4090-9d93-304e5964e85b.png?v=1776686859","url":"https:\/\/jlmmarine.com\/ru\/products\/8m0251133-water-pump-impeller-kit-for-mercury-30hp-40hp-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}