{"product_id":"27-99757-exhaust-manifold-gasket-for-mercruiser-volvo-omc-crusader-4-3-v6-jlm-marine","title":"27-99757 Exhaust Manifold Gasket for MerCruiser Volvo OMC Crusader 4.3 V6 | JLM Marine","description":"\u003ch2\u003eExhaust Manifold Gasket for MerCruiser, Volvo, OMC \u0026amp; Crusader 4.3 V6 Engines\u003c\/h2\u003e\n\n\u003cp\u003eThis high-quality exhaust manifold gasket is engineered for GM 4.3 V-6 marine engines used across MerCruiser, Volvo Penta, OMC, and Crusader stern drives. Designed to meet and exceed factory specifications, this gasket provides a reliable seal for exhaust manifold mounting applications.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket replacement directly crosses to \u003cstrong\u003eMerCruiser 27-99757\u003c\/strong\u003e, \u003cstrong\u003eVolvo 3853412\u003c\/strong\u003e, \u003cstrong\u003eOMC 856116\u003c\/strong\u003e, and \u003cstrong\u003eCrusader 97498\u003c\/strong\u003e, along with multiple aftermarket equivalents. It ensures proper sealing and durability under demanding marine conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eDirect fit for 4.3L V6 marine engines\u003c\/li\u003e\n\u003cli\u003eManufactured to OEM specifications for reliable performance\u003c\/li\u003e\n\u003cli\u003eCompatible with multiple stern drive brands\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e27-99757\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOMC\u003c\/td\u003e\n\u003ctd\u003e3853412\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolvo\u003c\/td\u003e\n\u003ctd\u003e856116\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrusader\u003c\/td\u003e\n\u003ctd\u003e97498\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-2909\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-61421\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e32170\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\n\u003cp\u003eThis gasket fits all \u003cstrong\u003e4.3L GM V-6\u003c\/strong\u003e marine engines installed in MerCruiser, Volvo Penta, OMC, and Crusader stern drive applications.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Number\u003c\/td\u003e\n\u003ctd\u003e27-99757\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEngine Type\u003c\/td\u003e\n\u003ctd\u003e4.3L GM V-6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eExhaust Manifold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-quality composite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e1 × Exhaust Manifold Gasket (27-99757)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and allow the engine to cool completely before beginning work.\u003c\/li\u003e\n\u003cli\u003eRemove the exhaust manifold bolts and carefully separate the manifold from the cylinder head.\u003c\/li\u003e\n\u003cli\u003eThoroughly clean both the manifold and cylinder head mating surfaces, removing all old gasket material and debris.\u003c\/li\u003e\n\u003cli\u003eInspect the manifold and head for warping, cracks, or damage; resurface or replace if necessary.\u003c\/li\u003e\n\u003cli\u003ePosition the new gasket onto the cylinder head, aligning all bolt holes carefully.\u003c\/li\u003e\n\u003cli\u003eReinstall the exhaust manifold, ensuring proper alignment with the gasket.\u003c\/li\u003e\n\u003cli\u003eHand-tighten all manifold bolts first, then torque them to the manufacturer's specifications in the recommended sequence (typically center-out).\u003c\/li\u003e\n\u003cli\u003eReconnect any exhaust components, hoses, and fittings that were removed.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery and start the engine, checking for exhaust leaks around the manifold.\u003c\/li\u003e\n\u003cli\u003eAllow the engine to reach operating temperature and recheck for any signs of leakage.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my exhaust manifold gasket needs replacing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common signs include exhaust leaks (visible steam or soot), unusual exhaust noise or hissing near the manifold, decreased engine performance, or overheating. Inspect the gasket area during routine maintenance for deterioration or damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will this gasket fit both port and starboard manifolds?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes, this gasket is designed to fit exhaust manifolds on both sides of 4.3L V-6 engines. Verify your application against the cross-reference numbers listed above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the exhaust manifold gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the gasket whenever the exhaust manifold is removed for service or repair. Regular inspection during engine maintenance is recommended, especially in high-hour or saltwater applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gasket if it looks okay?\u003c\/strong\u003e\u003cbr\u003e\nA: No, exhaust manifold gaskets are designed for single use. Reusing a gasket can result in improper sealing and exhaust leaks. Always install a new gasket when reassembling.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket gaskets?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981020430649,"sku":"24GK055","price":21.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/s-l500.webp?v=1772414671","url":"https:\/\/jlmmarine.com\/es\/products\/27-99757-exhaust-manifold-gasket-for-mercruiser-volvo-omc-crusader-4-3-v6-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}