{"product_id":"mercury-pulley-865777","title":"Mercury – Water Pump Pulley | Cooling System Component | Cast Steel Finish | 865777","description":"\u003ch3\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Water Pump Pulley | Cooling System Component | Cast Steel Finish | 865777\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThere is something comforting about hearing your engine settle into that smooth, steady rhythm after you push off from the dock. The cooling system plays a huge part in that peace of mind, and the water pump pulley is right at the center of it. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen you’re running a boat you love — one that carries your family, your gear, and your weekend plans — you want every part under the hatch to work without hesitation. That’s exactly why this Mercury Marine part number 865777 feels like a quiet but essential companion on the water. It keeps the flow steady, the temperature stable, and your confidence high, no matter how long the day gets.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eKe\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ey Features\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDrives the engine water pump with smooth, consistent rotation.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt from durable, marine-grade cast steel.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned specifically for serpentine belt systems.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngineered to maintain correct belt alignment and tension.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eResistant to heat, corrosion, and vibration in marine environments.\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\n\u003cspan data-preserver-spaces=\"true\"\u003eFits \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e4.5L\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e6.2L\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e MerCruiser sterndrive and inboard engines.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eAl\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eso compatible with \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e8.1L\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e8.2L\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e engines using serpentine belt systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for both \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003etow-sport boats\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003esterndrive-powered cruisers.\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommon on runabouts, family cruisers, performance boats, and modern sport boats.\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\"\u003eYou feel the difference a quality pulley makes long before you ever look at it. When it’s built right, the belt tracks true and the water pump runs with a steady, confident rhythm. There’s no wobble, no chirping, no strange vibration sneaking into your helm. This pulley keeps your cooling system tight and predictable, which means your engine holds its temperature even when you’re running hard or towing heavy loads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIts cast steel construction stands up to constant tension and hours of heat cycling, so you’re not worrying about deformation or uneven wear. Because it’s engineered specifically for Mercury’s serpentine belt systems, it aligns naturally with the factory brackets — no shimming, no trial-and-error. The result is a smooth, rock-solid rotation that keeps your coolant moving exactly the way it should.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFor boaters who run in both saltwater and freshwater, the corrosion-resistant finish is a quiet blessing. It holds up against the harshness of marine air and the inevitable spray that finds its way into the bilge.\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\"\u003eA pulley might seem like a simple part, but choosing a genuine Mercury Marine pulley eliminates so many of the problems cheaper alternatives introduce — belt misalignment, noise, wobbling, premature wear. If you want your cooling system to work right the first time and stay reliable season after season, OEM is simply the smart move. It’s engineered to fit, engineered to last, and engineered for real boats in real conditions. It’s what I’d recommend to any fellow boater who wants less wrenching and more time on the water.\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 4.5L, 6.2L, 8.1L, and 8.2L engines with serpentine belts.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes OEM better than aftermarket here?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Perfect belt alignment and superior durability — two things non-OEM pulleys often struggle with.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know it’s the correct replacement?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match your engine model and ensure you’re running a serpentine system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Does it work in salt and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Absolutely — it’s built for harsh marine exposure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: Can most boat owners install it themselves?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes, with basic tools and access to the front of the engine.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935735173411,"sku":"865777","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/865777.jpg?v=1761578526","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-pulley-865777","provider":"PartsVu","version":"1.0","type":"link"}