{"product_id":"pulley-idler-865444t","title":"Quicksilver – Idler Pulley | MerCruiser V8 Series | Flat 3.5-Inch Pulley | 865444T","description":"\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQuicksilver – Idler Pulley | MerCruiser V8 Series | Flat 3.5-Inch Pulley | 865444T\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e There is a certain comfort in hearing your engine belt spin smoothly, with no chirps or chatter. When the belt system is right, you can feel it in the throttle response, the steering assist, even the way the boat settles into its cruise speed. If your idler pulley \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis worn\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, the whole engine starts to sound unsettled. This Mercury Marine part brings that quiet confidence back. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt is a small component, but it plays a \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ebig\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e role in keeping everything under the hatch running \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003esteady\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e and \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003edependable\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReplacement idler pulley for select MerCruiser V8 engines.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFlat 3.5-inch pulley design.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt for serpentine belt systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMarine-rated materials for corrosion resistance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury Marine part number 865444T.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits MerCruiser V8 engines: 350, 377, and 496 cubic inch platforms.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSuitable for 5.7L, 6.2L, and 8.1L V8 configurations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommonly used in cruisers, performance boats, runabouts, bowriders, and offshore hulls.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerforms well in both freshwater and saltwater boating.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOnce installed, the pulley brings immediate stability to the belt path. The flat design works seamlessly with the serpentine belt, keeping it aligned as it wraps around multiple accessory components. You’ll notice the engine tone getting smoother, the vibration dropping slightly, and the accessories responding more predictably.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe pulley’s marine-rated construction protects it from moisture, heat, and the constant vibration of a marine engine compartment. The bearing spins with a steady, centered feel, eliminating the belt oscillation that creates noise and uneven wear. On longer runs, this stability translates into more reliable alternator output, consistent cooling-water flow, and a quieter ride overall.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eReplacing the pulley is quick with basic tools, making it \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ean easy\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e upgrade during routine maintenance.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Once the new pulley is in place, it feels like the entire belt system tightens up — not over-tensioned, just more controlled and secure.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdler pulleys depend on precision. If the grooves aren’t shaped \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecorrectly,\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e or the bearing \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eisn’t rated\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e for marine heat, the pulley can fail early and take the belt with it. Aftermarket pulleys often cut corners in material hardness or bearing quality.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA Mercury Marine part avoids all those problems. The fitment is exact, the bearing is engineered for marine use, and the pulley runs true at all engine speeds. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt’s the safest choice for long-term reliability.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which engines does this pulley fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits MerCruiser V8 \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eengines:\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e 350, 377, and 496 cubic inch models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this better than aftermarket pulleys?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Marine-rated bearings, exact sizing, and OEM durability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I confirm it’s the right pulley?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Check your manual for pulley siz\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ee. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIf you need a flat 3.5-inch pulley and the part number 865444T appears, this is \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecorrec\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003et\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in saltwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes — the materials are resistant to corrosion.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Is installation straightforward?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Most boaters complete the job easily during belt replacement.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935738089763,"sku":"865444T","price":55.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/865444t_main-1.jpg?v=1760631278","url":"https:\/\/partsvu.com\/en-ca\/products\/pulley-idler-865444t","provider":"PartsVu","version":"1.0","type":"link"}