{"product_id":"mercury-mercruiser-cooling-hose-32-864551","title":"Mercury MerCruiser Quicksilver Cooling Hose — 32-864551","description":"\u003ch2\u003eMercury MerCruiser Quicksilver Molded Cooling Hose — 32-864551\u003c\/h2\u003e\n\n\u003cp\u003eThis genuine OEM molded cooling hose from Mercury Marine connects the \u003cstrong\u003eintake manifold bypass to the water circulating pump\u003c\/strong\u003e on select MerCruiser gasoline engines with a closed-cooling system. Formed to the exact curvature of the factory routing, it installs without trimming or modification and restores proper coolant flow through the bypass circuit.\u003c\/p\u003e\n\n\u003cp\u003eThe intake bypass hose plays a key role in regulating coolant temperature during warm-up and steady-state operation. A cracked or deteriorated hose at this position can reduce system efficiency and lead to overheating. Using the correct OEM part ensures the right bend geometry, wall thickness, and material compatibility for your engine’s cooling demands.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 864551 (full reference: 32-864551)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury Quicksilver\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Molded engine cooling hose\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Closed cooling — intake manifold bypass to water circulating pump\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New, genuine OEM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGTIN \/ UPC:\u003c\/strong\u003e 745061554535\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMerCruiser 4.3L MPI Alpha \/ Bravo (select serial ranges)\u003c\/li\u003e\n  \u003cli\u003eMerCruiser 5.0L MPI Alpha \/ Bravo (select serial ranges)\u003c\/li\u003e\n  \u003cli\u003eMerCruiser 350 MAG MPI Alpha \/ Bravo (select serial ranges)\u003c\/li\u003e\n  \u003cli\u003eOther MerCruiser gasoline engines using the same closed-cooling layout\u003c\/li\u003e\n  \u003cli\u003eConfirm fitment using your engine serial number and closed-cooling system diagram before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSerial Number Fitment Notice\u003c\/h3\u003e\n\u003cp\u003eMerCruiser uses different molded hoses depending on engine family, raw-water versus closed cooling, riser arrangement, and production serial range. Always verify your engine model, serial number, and cooling configuration against the parts diagram before ordering to confirm 32-864551 is correct for your application.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eHose is cracked, hardened, swollen, or chafed\u003c\/li\u003e\n  \u003cli\u003eLeaking or seeping at either molded end or clamp contact point\u003c\/li\u003e\n  \u003cli\u003eVisible deterioration or deformation from heat cycling\u003c\/li\u003e\n  \u003cli\u003eCoolant loss or overheating traced to the bypass circuit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAllow the engine to cool completely before beginning service\u003c\/li\u003e\n  \u003cli\u003eNote the original hose routing and clamp positions before removal\u003c\/li\u003e\n  \u003cli\u003eInspect the intake manifold bypass fitting and circulating pump connection for corrosion or damage\u003c\/li\u003e\n  \u003cli\u003eSecure firmly at both connections per Mercury installation guidelines\u003c\/li\u003e\n  \u003cli\u003eReplace clamps if worn or corroded\u003c\/li\u003e\n  \u003cli\u003eVerify the system is leak-free at operating temperature after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/11167580553252\"\u003eMercury MerCruiser Quicksilver Cooling Hose — 32-864552 (Thermostat Housing to Upper Manifold)\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/11167580586020\"\u003eMercury MerCruiser Quicksilver Cooling Hose 864578 — Drain Fitting to Check Valve\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/11167580618788\"\u003eMercury MerCruiser 864579 Cooling Hose — Check Valve to Thermostat Housing\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/8131397025828\"\u003eMercury Cooling Hose — 160211\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/8131426811940\"\u003eMercury MerCruiser 3.0L Drain System Adapter Assembly — 22-862605T1\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/8131543629860\"\u003e#3 SS Mini Hose Clamp 5\/16\"–9\/16\"\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/8131405316132\"\u003eMercury MerCruiser Nylon Hose Clamp — 54-415825\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use:\u003c\/strong\u003e Order 32-864551 when your closed-cooling system diagram shows the \u003cstrong\u003eintake manifold bypass to water circulating pump\u003c\/strong\u003e connection — that’s the precise identifier that separates it from nearby hoses like 864552, 864539, and 864431, which connect different components in the same system. The most common issue is customers ordering by engine family alone without checking the cooling configuration; this hose only applies to \u003cstrong\u003eclosed-cooling\u003c\/strong\u003e setups, not raw-water cooled engines. If you’re servicing the cooling system, consider replacing sibling hoses at the same time — they share the same service life. Have your engine serial number ready and our parts desk can confirm which hoses in this group apply to your engine.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324691841060,"sku":"864551","price":30.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_21114ea1-c957-405a-a6ce-f05de8ca401f.png?v=1788203218","url":"https:\/\/marisolmarine.com\/products\/mercury-mercruiser-cooling-hose-32-864551","provider":"Marisol Marine Company","version":"1.0","type":"link"}