{"product_id":"circulation-water-pump-for-omc-2-5-3-0-4-0-l-984360-21fp002","title":"Circulation Water Pump for OMC 2.5 3.0 4.0 L 984360","description":"\u003ch2\u003eCirculation Water Pump – Fits OMC 2.5L, 3.0L, 4.0L Marine Engines\u003c\/h2\u003e\n\u003cp\u003eThis is an aftermarket circulation water pump for OMC and Volvo Penta stern drive marine engines. It is designed to fit 2.5L, 3.0L, and 4.0L GM-based marine engines from 1982–1993.\u003c\/p\u003e\n\u003cp\u003eThis component directly replaces OMC part numbers 984360, 986779, 3854017, 3858340, 509356 and Volvo Penta part numbers 3854017, 3858340.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003eEngine block-mounted circulation pump for raw water cooling systems.\u003c\/li\u003e\n    \u003cli\u003eFeatures a durable cast aluminum housing with a brass impeller for corrosion resistance in fresh and saltwater.\u003c\/li\u003e\n    \u003cli\u003eIncludes the necessary mounting gasket for a complete installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\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\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e984360\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e986779\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e3854017\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e3858340\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e509356\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e3854017\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e3858340\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eSierra\u003c\/td\u003e\n                \u003ctd\u003e18-3575\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eMallory\u003c\/td\u003e\n                \u003ctd\u003e9-42605\u003c\/td\u003e\n            \u003c\/tr\u003e\n             \u003ctr\u003e\n                \u003ctd\u003eMerCruiser\u003c\/td\u003e\n                \u003ctd\u003e884727\u003c\/td\u003e\n            \u003c\/tr\u003e\n             \u003ctr\u003e\n                \u003ctd\u003eMerCruiser\u003c\/td\u003e\n                \u003ctd\u003e8M0113733\u003c\/td\u003e\n            \u003c\/tr\u003e\n             \u003ctr\u003e\n                \u003ctd\u003eMerCruiser\u003c\/td\u003e\n                \u003ctd\u003e65142A1\u003c\/td\u003e\n            \u003c\/tr\u003e\n             \u003ctr\u003e\n                \u003ctd\u003eMerCruiser\u003c\/td\u003e\n                \u003ctd\u003e879345T99\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eGLM\u003c\/td\u003e\n                \u003ctd\u003e15100\u003c\/td\u003e\n            \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n    \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n    \u003ctable\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\u003eStroke\u003c\/th\u003e\n                \u003cth\u003eYears\u003c\/th\u003e\n                \u003cth\u003eOEM Part No.\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\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e2.5L\u003c\/td\u003e\n                \u003ctd\u003e120-140 HP\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1982-1986\u003c\/td\u003e\n                \u003ctd\u003e984360\u003c\/td\u003e\n                \u003ctd\u003eStern drive applications\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e3.0L\u003c\/td\u003e\n                \u003ctd\u003e130-140 HP\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1982-1993\u003c\/td\u003e\n                \u003ctd\u003e984360, 986779\u003c\/td\u003e\n                \u003ctd\u003eStern drive applications\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eOMC\u003c\/td\u003e\n                \u003ctd\u003e4.0L\u003c\/td\u003e\n                \u003ctd style=\"text-align: center;\"\u003e-\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1989-1993\u003c\/td\u003e\n                \u003ctd\u003e984360\u003c\/td\u003e\n                \u003ctd\u003eUsed in Sea Drive models\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e2.5L\u003c\/td\u003e\n                \u003ctd\u003e120 HP\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1982-1986\u003c\/td\u003e\n                \u003ctd\u003e3854017\u003c\/td\u003e\n                \u003ctd\u003eStern drive applications\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e3.0L\u003c\/td\u003e\n                \u003ctd\u003e130-140 HP\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1982-1993\u003c\/td\u003e\n                \u003ctd\u003e3854017, 3858340\u003c\/td\u003e\n                \u003ctd\u003eStern drive applications\u003c\/td\u003e\n            \u003c\/tr\u003e\n             \u003ctr\u003e\n                \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n                \u003ctd\u003e4.0L\u003c\/td\u003e\n                \u003ctd style=\"text-align: center;\"\u003e-\u003c\/td\u003e\n                \u003ctd\u003e4-Stroke\u003c\/td\u003e\n                \u003ctd\u003e1989-1993\u003c\/td\u003e\n                \u003ctd\u003e3854017\u003c\/td\u003e\n                \u003ctd\u003eSea Drive applications\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\u003ctable\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\u003eProduct Type\u003c\/td\u003e\n            \u003ctd\u003eCirculation Water Pump (Raw Water Pump)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eInstallation\u003c\/td\u003e\n            \u003ctd\u003e\u003cstrong\u003eDirect bolt-on replacement\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eConnection\u003c\/td\u003e\n            \u003ctd\u003eDirect mount to engine block\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eHousing Material\u003c\/td\u003e\n            \u003ctd\u003eCast aluminum with \u003cstrong\u003ebrass impeller\u003c\/strong\u003e\n\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eHousing Color\u003c\/td\u003e\n            \u003ctd\u003eNatural metal\/silver\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eFitting Type\u003c\/td\u003e\n            \u003ctd\u003eDirect mount\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eOther Technical Attributes\u003c\/td\u003e\n            \u003ctd\u003eBrass impeller for salt and fresh water applications\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n    \u003cli\u003e1 x Circulation Water Pump (\u003cspan style=\"color:red;\"\u003e984360\/3854017\u003c\/span\u003e)\u003c\/li\u003e\n    \u003cli\u003e1 x Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eExplosion Diagram\u003c\/h2\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/3854017.png?v=1728429953\" alt=\"Explosion Diagram\" loading=\"lazy\"\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n    \u003cli\u003eDrain the cooling system completely to avoid spills. Disconnect the negative battery terminal.\u003c\/li\u003e\n    \u003cli\u003eLoosen the belt tensioner and remove the serpentine belt from the pump pulley.\u003c\/li\u003e\n    \u003cli\u003eUnscrew the mounting bolts holding the old water pump to the engine block.\u003c\/li\u003e\n    \u003cli\u003eGently tap the old pump to break the seal and remove it. Be prepared for some residual coolant leakage.\u003c\/li\u003e\n    \u003cli\u003eClean the mounting surface on the engine block thoroughly, removing all old gasket material and residue.\u003c\/li\u003e\n    \u003cli\u003ePlace the new gasket onto the engine block, aligning it with the bolt holes.\u003c\/li\u003e\n    \u003cli\u003eMount the new water pump, ensuring it sits flush against the gasket.\u003c\/li\u003e\n    \u003cli\u003eHand-tighten the mounting bolts, then torque them to the manufacturer's specified values in a star pattern.\u003c\/li\u003e\n    \u003cli\u003eReinstall the pulley and serpentine belt, ensuring proper tension.\u003c\/li\u003e\n    \u003cli\u003eReconnect all hoses to the new pump and secure the clamps.\u003c\/li\u003e\n    \u003cli\u003eRefill the cooling system with the appropriate coolant mixture. Reconnect the battery.\u003c\/li\u003e\n    \u003cli\u003eStart the engine, check for leaks, and top off the coolant as the system bleeds air.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this pump fits my OMC or Volvo Penta engine?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The best method is to match the part number from your old pump to one of the numbers listed in our cross-reference table. Additionally, verify your engine model and year falls within the ranges specified in the compatible models list.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What makes this pump suitable for saltwater use?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This pump is constructed with a \u003cstrong\u003ebrass impeller\u003c\/strong\u003e, which offers superior corrosion resistance compared to standard steel or plastic impellers, making it ideal for both saltwater and freshwater marine environments.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the common signs of a failing circulation water pump?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Key symptoms include engine overheating, visible coolant leaks from the pump's weep hole or gasket, a wobbly or noisy pump pulley, or a loose-feeling pump shaft.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: 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\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: 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\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: 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\u003cul\u003e\n    \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—\u003cstrong\u003edo not proceed with the purchase\u003c\/strong\u003e.\u003c\/li\u003e\n    \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProfessional installation is recommended\u003c\/strong\u003e to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\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":49587686998329,"sku":"21FP002","price":76.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Circulation_Water_Pump_for_Volvo_Penta_25_30_40_L___3854017_-_JLM_MARINE-8288302.jpg?v=1755742084","url":"https:\/\/jlmmarine.com\/products\/circulation-water-pump-for-omc-2-5-3-0-4-0-l-984360-21fp002","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}