{"product_id":"mercury-mercruiser-serpentine-belt-865615010","title":"Mercury MerCruiser Quicksilver Serpentine Belt 865615010 | 2195 mm | 5.0L–6.2L V8","description":"\u003ch2\u003eMercury MerCruiser Quicksilver Serpentine Belt 865615010\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 865615010 (Mercury service format: 57-865615010)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury Marine \/ MerCruiser \/ Quicksilver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Multi-Rib Serpentine Accessory Drive Belt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Length:\u003c\/strong\u003e Approximately 2195 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Type:\u003c\/strong\u003e Multi-rib serpentine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Engine accessory drive (alternator, seawater pump)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-Reference Numbers:\u003c\/strong\u003e 865615Q10, 57-865615010, 57-86387610\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaced By:\u003c\/strong\u003e No confirmed further supersession — 865615010 is current\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat This Belt Does\u003c\/h2\u003e\n\u003cp\u003eThe Mercury Marine 865615010 is a genuine OEM multi-rib serpentine belt for selected MerCruiser small-block V8 engines. It transfers power from the crankshaft to the alternator and seawater pump in the engine’s accessory drive system. Many documented applications are \u003cstrong\u003eMIE inboard engines with closed cooling systems\u003c\/strong\u003e using a \u003cstrong\u003e4-1\/4 inch idler pulley configuration\u003c\/strong\u003e. The multi-rib design provides strong, quiet pulley grip under the high-load conditions of marine accessory systems.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser \u003cstrong\u003e5.0L V8 (305 CID)\u003c\/strong\u003e — 2001 and later MIE inboard configurations\u003c\/li\u003e\n\u003cli\u003eMerCruiser \u003cstrong\u003e5.7L V8 (350 MAG \/ 350 MAG MPI)\u003c\/strong\u003e — MIE inboard configurations\u003c\/li\u003e\n\u003cli\u003eMerCruiser \u003cstrong\u003e6.2L MPI\u003c\/strong\u003e — MIE inboard configurations\u003c\/li\u003e\n\u003cli\u003eMerCruiser \u003cstrong\u003eMX 6.2L MPI Horizon\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm by engine model, serial number, cooling system configuration (open or closed), and accessory-drive pulley arrangement before ordering. Engines of the same displacement can use different belt lengths depending on the alternator, seawater pump pulley diameter, and idler pulley size.\u003c\/p\u003e\n\n\u003ch2\u003eCross-Reference Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury \/ Quicksilver:\u003c\/strong\u003e 865615010, 57-865615010, 865615Q10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEarlier Mercury reference:\u003c\/strong\u003e 57-86387610\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: \u003cstrong\u003e865615Q10\u003c\/strong\u003e and \u003cstrong\u003e865615010\u003c\/strong\u003e are related Mercury part numbers for this belt family. Confirm which number your engine’s parts diagram specifies before ordering — see also the \u003ca href=\"\/products\/11167580717092\"\u003eMercury Quicksilver 865615Q10 Serpentine Belt\u003c\/a\u003e listing for the Q10 application.\u003c\/p\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cp\u003eInspect the serpentine belt annually at seasonal service. Replace immediately if the belt shows cracking, glazing, fraying, rib separation, or excessive stretch. A slipping or squealing belt under load, or one riding low in the pulley grooves, should be replaced regardless of age. A failed serpentine belt simultaneously disables the alternator and seawater pump, causing loss of battery charging and raw water cooling flow.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBelt is visibly cracked, glazed, frayed, or has separated ribs\u003c\/li\u003e\n\u003cli\u003eBelt squeals or slips under accessory load\u003c\/li\u003e\n\u003cli\u003eBelt rides low or unevenly in the pulley grooves\u003c\/li\u003e\n\u003cli\u003eAlternator or seawater pump output is inconsistent\u003c\/li\u003e\n\u003cli\u003eBelt has been in service beyond the manufacturer’s recommended interval\u003c\/li\u003e\n\u003cli\u003eIdler pulley or tensioner replacement requires belt removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect all pulleys (alternator, seawater pump, idler) for wear, groove damage, and alignment before installing\u003c\/li\u003e\n\u003cli\u003eCheck the idler pulley bushing for wear — a worn bushing causes belt misalignment and premature failure\u003c\/li\u003e\n\u003cli\u003eDo not force the belt over pulley flanges — route by hand using the idler to release tension\u003c\/li\u003e\n\u003cli\u003eSet belt tension per Mercury service specifications — both over- and under-tensioning cause premature failure\u003c\/li\u003e\n\u003cli\u003eRotate the engine by hand to confirm correct seating across all pulley ribs\u003c\/li\u003e\n\u003cli\u003eRecheck tension after the first operating period\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between 865615010 and 865615Q10?\u003c\/strong\u003e\u003cbr\u003eThese are related Mercury part numbers in the same belt family. Both are documented for MerCruiser 5.7L and 6.2L MPI MIE applications. Confirm which number appears in your engine’s parts diagram by serial number — they are not always interchangeable without diagram confirmation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does this belt fit some 5.7L engines but not others?\u003c\/strong\u003e\u003cbr\u003eMerCruiser 5.7L engines were produced in multiple configurations with different accessory layouts, cooling systems (open vs. closed), and pulley sizes. The 865615010 is specifically documented for MIE closed-cooling applications with a 4-1\/4 inch idler pulley. Always verify by serial number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat else should I inspect when replacing this belt?\u003c\/strong\u003e\u003cbr\u003eInspect the idler pulley and bushing, seawater pump pulley, and alternator pulley for wear or damage. A worn idler bushing (865193) is a common cause of belt misalignment and accelerated wear on this accessory drive system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use an aftermarket belt?\u003c\/strong\u003e\u003cbr\u003eSierra 18-15122 is documented as an aftermarket equivalent. For critical marine applications, using a genuine Mercury Marine OEM belt eliminates fitment uncertainty from aftermarket dimensional tolerances.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167580717092\"\u003eMercury Quicksilver 865615Q10 Serpentine Belt — MerCruiser 5.7L \u0026amp; 6.2L MPI MIE\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167580684324\"\u003eMercury Quicksilver 865615Q06 Serpentine Belt — MerCruiser V8 5.0L–8.2L Sterndrive\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131443654692\"\u003eMercury MerCruiser Serpentine Belt \u0026amp; Pulley Kit 8M0150824\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131430121508\"\u003eMercury Idler Pulley Support Bushing 865193\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131443621924\"\u003eMercury MerCruiser Seawater Pump Pulley 8M0150724\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131443589156\"\u003eMercury MerCruiser Power Steering Pump Pulley 8M0150723\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11061073608740\"\u003eQuicksilver 70 Amp Alternator Delco Serpentine 862031T1\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003eThe most common issue with 865615010 orders is customers selecting by displacement alone without confirming the cooling system configuration and idler pulley size. This belt is specifically documented for \u003cstrong\u003eMIE closed-cooling applications with a 4-1\/4 inch idler pulley\u003c\/strong\u003e — the same engine in an open-cooling or sterndrive configuration may use a different belt entirely. Always verify by engine serial number and parts diagram. When replacing this belt, check the idler pulley bushing (865193) at the same time: a worn bushing is a frequent cause of belt noise, misalignment, and early failure on this accessory drive, and it is inexpensive to replace alongside the belt.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563898306596,"sku":"865615010","price":119.1,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/68accfc6-0586-4a7f-9537-3804bb4054c9.png?v=1773259817","url":"https:\/\/marisolmarine.com\/products\/mercury-mercruiser-serpentine-belt-865615010","provider":"Marisol Marine Company","version":"1.0","type":"link"}