{"product_id":"gasket-27-887978","title":"Mercury – Thermostat Gasket | FourStroke \/ SeaPro \/ Verado \/ Racing Series | Heat-Resistant O-Ring | 887978","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – Thermostat Gasket | FourStroke \/ SeaPro \/ Verado \/ Racing Series | Heat-Resistant O-Ring | 887978\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\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’s a certain comfort in knowing your engine is running at the exact temperature it should — not too hot, not too \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ecool\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, just right in that sweet spot where everything feels smooth and dependable. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAnyone who spends long mornings trolling or \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003efull\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e afternoons cruising knows how quickly peace of mind disappears when something in the cooling system starts acting up. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury Marine part number 887978 Thermostat Gasket\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e might be small, 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 your outboard steady and responsive. When this gasket \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis sealing\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the system properly, you feel the engine settle into its rhythm, and that’s when boating becomes effortless again.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eO-ring style gasket for secure thermostat housing sealing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBuilt from durable, heat-resistant material designed to withstand vibration and thermal cycling\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eManufactured to exact Mercury Marine OEM specifications for long-lasting performance\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHelps maintain proper thermostat function and stable engine temperatures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesigned for dependable sealing in a wide range of FourStroke, SeaPro, Verado, and Racing outboards\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 35-40 Jet \/ 40 \/ 50 \/ 60 EFI FourStroke (4-cylinder)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits select SeaPro 40 \/ 50 \/ 60 EFI (serial 1C453840 \u0026amp; up)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits 40 \/ 50 \/ 60 \/ Jet 40 EFI FourStroke (1C050252–1C453839)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits 60R FourStroke (1C615064 \u0026amp; up)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits 350 \/ 400 \/ 425 5.7L V10 Verado \u0026amp; 350 5.7L V10 SeaPro AMS (3B266064 \u0026amp; up)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits 400R 5.7L V10 Verado FourStroke (3B272954 \u0026amp; up)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Formula 60 (4-cylinder) FourStroke (1C104574 \u0026amp; up)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eCommon on fishing boats, pontoons, runabouts, bay boats, and performance hulls\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e In real use, a thermostat gasket like this affects far more than you’d expect. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen it seals properly, the cooling system \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003estays\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e tight and stable, helping your engine warm up smoothly and maintain \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ean even\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e temperature throughout the day.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e You’ll notice the difference in how steady the idle feels, how cleanly the throttle responds, and how the engine tone settles into that familiar hum seasoned boaters learn to trust.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis gasket \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ebuilt\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e to \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ehandle\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e heat \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eswings\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003elong hours\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e, and constant vibration — all the \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ethings\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e an outboard \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eexperiences\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e during a busy season.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIt resists flattening, cracking, and hardening, which keeps the coolant where it belongs and protects your engine from costly temperature-related issues. Installation is simple and satisfying; the gasket seats cleanly, and once in place, it delivers a secure, leak-free seal that lasts. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhether you’re putting in long days offshore, cruising from marina to marina, or working your engine hard in shallow rivers, this gasket helps maintain the cooling reliability you depend on.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy Buy OEM\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Cooling systems are not the place to experiment with aftermarket shortcuts.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eA \u003c\/span\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003egenuine Mercury Marine part\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003elike\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e the 887978 \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eis engineered\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e to match your engine’s thermostat housing perfectly, providing the exact compression and seal needed for consistent performance.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAftermarket versions may \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003elook\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e similar, but they often \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003euse\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e cheaper materials that degrade \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003efaster\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e under heat and vibration.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Choosing OEM means fewer surprises, fewer leaks, and fewer headaches.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It’s the practical, seasoned-boater choice — the one that keeps your outboard healthy for the long haul.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which engines does the Thermostat Gasket 887978 fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits a wide range of Mercury FourStroke, SeaPro, Verado, Racing, and Formula 60 engines, including 4-cylinder EFI models and new 5.7L V10 platforms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this different from aftermarket gaskets?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e The material quality and precision. Mercury designs it to hold shape under heat and vibration, ensuring a tighter, longer-lasting seal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know if this is the correct replacement for my engine?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Match your engine model and serial range to the compatibility list above. If your engine is within those groups, this is typically the correct gasket.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can it be used in both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe material resists corrosion, swelling, and degradation, regardless of the water conditions you boat \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003ein\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\"\u003eQ5: Is installation easy for most boat owners?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Definitely\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e. Most\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e boaters can install it during a thermostat service with basic tools and a little patience.\u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626538623267,"sku":"27-887978","price":2.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/27-887978.jpg?v=1761164659","url":"https:\/\/partsvu.com\/fr-ca\/products\/gasket-27-887978","provider":"PartsVu","version":"1.0","type":"link"}