{"product_id":"3857391-hose-thermostat-housing-circulating-water-pump-for-volvo-penta-mercruiser-jlm-marine","title":"3857391 Hose Thermostat Housing Circulating Water Pump for Volvo Penta Mercruiser | JLM Marine","description":"\u003ch2\u003eHose Thermostat Housing Circulating Water Pump for Volvo Penta Mercruiser | JLM Marine\u003c\/h2\u003e\n\n\u003cp\u003eThis premium aftermarket hose is designed for Mercruiser 4-cylinder engines (2.5L and 3.0L), providing reliable connectivity between the thermostat housing and circulating water pump. Engineered to meet OEM specifications, this direct replacement part ensures proper coolant flow and temperature regulation in your marine engine.\u003c\/p\u003e\n\n\u003cp\u003eThis hose directly replaces Volvo Penta 3857391 and multiple aftermarket part numbers including 509282, 8M0071007, 9-44050, and 96879. It fits Mercruiser engines manufactured between 1982 and 2003, offering broad compatibility across two decades of marine engine production.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for thermostat housing to water pump connection\u003c\/li\u003e\n  \u003cli\u003eCompatible with Mercruiser 4-cylinder 2.5L and 3.0L engines (1982-2003)\u003c\/li\u003e\n  \u003cli\u003eCross-references multiple OEM and aftermarket part numbers for easy identification\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      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n      \u003ctd\u003e3857391\u003c\/td\u003e\n      \u003ctd\u003eOEM Reference\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercruiser\u003c\/td\u003e\n      \u003ctd\u003e32-96879\u003c\/td\u003e\n      \u003ctd\u003eManufacturer PN\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n      \u003ctd\u003e509282\u003c\/td\u003e\n      \u003ctd\u003eCross Reference\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n      \u003ctd\u003e8M0071007\u003c\/td\u003e\n      \u003ctd\u003eCross Reference\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n      \u003ctd\u003e9-44050\u003c\/td\u003e\n      \u003ctd\u003eCross Reference\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAftermarket\u003c\/td\u003e\n      \u003ctd\u003e96879\u003c\/td\u003e\n      \u003ctd\u003eCross Reference\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.\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\u003eYears\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\u003eMercruiser\u003c\/td\u003e\n      \u003ctd\u003e4 Cyl 2.5L\u003c\/td\u003e\n      \u003ctd\u003e1982-2003\u003c\/td\u003e\n      \u003ctd\u003eThermostat housing to water pump hose\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercruiser\u003c\/td\u003e\n      \u003ctd\u003e4 Cyl 3.0L\u003c\/td\u003e\n      \u003ctd\u003e1982-2003\u003c\/td\u003e\n      \u003ctd\u003eThermostat housing to water pump hose\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\u003ePart Type\u003c\/td\u003e\n      \u003ctd\u003eHose\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eThermostat Housing to Circulating Water Pump\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible Engine Type\u003c\/td\u003e\n      \u003ctd\u003eMercruiser 4-Cylinder 2.5L, 3.0L\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYear Range\u003c\/td\u003e\n      \u003ctd\u003e1982-2003\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e3857391\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eManufacturer PN\u003c\/td\u003e\n      \u003ctd\u003e32-96879\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\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e1 × Hose (Thermostat Housing to Circulating Water Pump)\u003c\/strong\u003e\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 completely cool and disconnect the battery to prevent accidental starts.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrain Coolant:\u003c\/strong\u003e Drain the cooling system into an appropriate container to prevent spills during hose removal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccess the Hose:\u003c\/strong\u003e Locate the existing hose connecting the thermostat housing to the circulating water pump on your engine.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove Clamps:\u003c\/strong\u003e Use pliers or a screwdriver to loosen and remove the hose clamps at both ends of the old hose.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove Old Hose:\u003c\/strong\u003e Carefully pull the old hose off both fittings. If it's stuck, gently twist while pulling to break the seal.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean Fittings:\u003c\/strong\u003e Inspect and clean both the thermostat housing and water pump fittings, removing any old sealant or debris.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstall New Hose:\u003c\/strong\u003e Slide the new hose onto the thermostat housing fitting first, ensuring it seats fully.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecure First End:\u003c\/strong\u003e Position a hose clamp over the thermostat housing connection and tighten securely.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnect Second End:\u003c\/strong\u003e Route the hose to the water pump fitting and slide it fully onto the connection point.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecure Second End:\u003c\/strong\u003e Install and tighten the second hose clamp on the water pump end.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRefill Coolant:\u003c\/strong\u003e Refill the cooling system with the appropriate coolant mixture per manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTest and Inspect:\u003c\/strong\u003e Reconnect the battery, start the engine, and inspect all connections for leaks while the engine warms up.\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 hose fits my Mercruiser engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine is a Mercruiser 4-cylinder 2.5L or 3.0L manufactured between 1982 and 2003. Cross-reference your current part number with the numbers listed in our cross-reference table (3857391, 509282, 8M0071007, 9-44050, 96879, or 32-96879).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace this cooling system hose?\u003c\/strong\u003e\u003cbr\u003e\nA: Inspect cooling hoses annually for cracks, bulging, soft spots, or deterioration. Replace every 3-5 years as preventive maintenance, or immediately if you notice any signs of wear, leaks, or engine overheating issues.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that this hose needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common warning signs include visible cracks or splits in the rubber, coolant leaks near the connections, hose swelling or bulging, engine overheating, or a mushy feel when you squeeze the hose. Replace immediately if any of these symptoms appear.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this hose on other engine models not listed?\u003c\/strong\u003e\u003cbr\u003e\nA: This hose is specifically designed for Mercruiser 4-cylinder 2.5L and 3.0L engines from 1982-2003. Using it on other models may result in improper fit, coolant leaks, or engine damage. Always verify compatibility before installation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between this aftermarket hose and the OEM version?\u003c\/strong\u003e\u003cbr\u003e\nA: This aftermarket replacement is manufactured to meet OEM specifications using quality materials. While not an original equipment part, it provides reliable performance at a competitive price point.\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. Returns are accepted within our standard return window for unused items in original condition. Contact our support team for assistance.\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 before purchasing.\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 Trusted manufacturer for over 20 years, supplying 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":51960670486841,"sku":"18H1004","price":37.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/ULB8c8G3qgnJXKJkSaelq6xUzXXam.webp?v=1771677639","url":"https:\/\/jlmmarine.com\/ru\/products\/3857391-hose-thermostat-housing-circulating-water-pump-for-volvo-penta-mercruiser-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}