{"product_id":"728271-92605-power-head-gasket-set-for-yanmar-2gm20-2gm20b-2gm20c-2gm20f-jlm-marine","title":"728271-92605 Power Head Gasket Set for Yanmar 2GM20 2GM20B 2GM20C 2GM20F | JLM Marine","description":"\u003ch2\u003ePower Head Gasket Set for Yanmar 2GM20 2GM20B 2GM20C 2GM20F | JLM Marine\u003c\/h2\u003e\n\n\u003cp\u003eThis premium aftermarket \u003cstrong\u003ePower Head Gasket Set\u003c\/strong\u003e is engineered for \u003cstrong\u003eYanmar 18 HP marine diesel engines\u003c\/strong\u003e, specifically designed to fit the \u003cstrong\u003e2GM20, 2GM20B, 2GM20C, and 2GM20F\u003c\/strong\u003e models. Built to OEM specifications, this complete gasket set ensures reliable sealing and optimal engine performance during rebuilds and overhauls.\u003c\/p\u003e\n\n\u003cp\u003eThis gasket set directly replaces \u003cstrong\u003eYanmar OEM part number 728271-92605\u003c\/strong\u003e (with 128271-01911) and is cross-referenced as \u003cstrong\u003eSierra 18-55502\u003c\/strong\u003e, providing seamless compatibility with your Yanmar marine engine. Manufactured to exact tolerances, it delivers long-lasting durability and dependable service in demanding marine environments.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eComplete power head gasket set for comprehensive sealing during engine rebuilds\u003c\/li\u003e\n  \u003cli\u003ePrecision-engineered for Yanmar 18 HP 2GM20 series diesel engines\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for OEM and aftermarket part numbers\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\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYanmar\u003c\/td\u003e\n      \u003ctd\u003e728271-92605\u003c\/td\u003e\n      \u003ctd\u003eOEM, includes 128271-01911\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra\u003c\/td\u003e\n      \u003ctd\u003e18-55502\u003c\/td\u003e\n      \u003ctd\u003eAftermarket replacement\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\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\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003eModel\u003c\/th\u003e\n      \u003cth\u003eRated HP\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYanmar\u003c\/td\u003e\n      \u003ctd\u003e2GM20\u003c\/td\u003e\n      \u003ctd\u003e18 HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYanmar\u003c\/td\u003e\n      \u003ctd\u003e2GM20B\u003c\/td\u003e\n      \u003ctd\u003e18 HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYanmar\u003c\/td\u003e\n      \u003ctd\u003e2GM20C\u003c\/td\u003e\n      \u003ctd\u003e18 HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eYanmar\u003c\/td\u003e\n      \u003ctd\u003e2GM20F\u003c\/td\u003e\n      \u003ctd\u003e18 HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\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\u003eProduct Type\u003c\/td\u003e\n      \u003ctd\u003ePower Head Gasket Set\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eYanmar 18 HP Marine Diesel Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible Models\u003c\/td\u003e\n      \u003ctd\u003e2GM20, 2GM20B, 2GM20C, 2GM20F\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e728271-92605\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra Part Number\u003c\/td\u003e\n      \u003ctd\u003e18-55502\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\u003cp\u003eThis complete gasket set includes all necessary components for a proper power head rebuild:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × Power Head Gasket Set\u003c\/strong\u003e\u003c\/span\u003e (complete with all gaskets required for power head overhaul)\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 cylinder head following your engine's service manual torque sequence and procedures.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean all mating surfaces on the cylinder head, block, and cover using appropriate gasket remover. Ensure no residue or old gasket material remains.\u003c\/li\u003e\n  \u003cli\u003eInspect the cylinder head and block for warping, cracks, or damage; resurface or replace components as needed.\u003c\/li\u003e\n  \u003cli\u003eCompare the new gaskets with the old ones to confirm correct fitment and orientation.\u003c\/li\u003e\n  \u003cli\u003eInstall the new gaskets dry or with a thin coat of gasket sealant as specified by Yanmar service procedures. Do not over-apply sealant.\u003c\/li\u003e\n  \u003cli\u003ePosition the cylinder head carefully onto the block, ensuring gaskets remain properly aligned.\u003c\/li\u003e\n  \u003cli\u003eInstall cylinder head bolts hand-tight, then torque in the proper sequence to Yanmar specifications using a calibrated torque wrench.\u003c\/li\u003e\n  \u003cli\u003eReinstall all removed components, hoses, and fittings in reverse order of disassembly.\u003c\/li\u003e\n  \u003cli\u003eRefill coolant and engine oil to proper levels; check for correct fluid specifications.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery and perform initial start-up, monitoring for leaks or abnormal noises.\u003c\/li\u003e\n  \u003cli\u003eAfter the first few hours of operation, recheck head bolt torque and inspect for any coolant or oil leaks.\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 confirm this gasket set fits my Yanmar engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Cross-reference your engine model (2GM20, 2GM20B, 2GM20C, or 2GM20F) with the compatibility table above. Verify your existing OEM part number is 728271-92605 or Sierra 18-55502 to ensure proper fit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between this aftermarket gasket set and the OEM version?\u003c\/strong\u003e\u003cbr\u003e\nA: This aftermarket gasket set is manufactured to OEM specifications using comparable materials and tolerances. It delivers reliable performance at a more competitive price point while meeting the same sealing and durability standards required for marine diesel applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: When should I replace the power head gaskets on my Yanmar engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace gaskets during scheduled engine overhauls, if you experience coolant or oil leaks from the cylinder head area, loss of compression, or overheating issues. Always inspect gaskets during head removal and replace as a complete set.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse old gaskets during reassembly?\u003c\/strong\u003e\u003cbr\u003e\nA: No, gaskets are designed for one-time use. Once compressed, they lose their sealing integrity. Always install a complete new gasket set during any power head service or rebuild to prevent leaks and ensure reliable engine operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do I need any special sealant or adhesive when installing these gaskets?\u003c\/strong\u003e\u003cbr\u003e\nA: Follow Yanmar's service manual recommendations. Some gaskets install dry, while others may require a thin coat of approved gasket sealant. Over-application can cause leaks or gasket failure, so use sealant sparingly and only where specified.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or an aftermarket replacement?\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":51980999590201,"sku":"23GK292","price":149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_d8559611-4b0c-4460-ae17-17cbea180172.jpg?v=1772414113","url":"https:\/\/jlmmarine.com\/es\/products\/728271-92605-power-head-gasket-set-for-yanmar-2gm20-2gm20b-2gm20c-2gm20f-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}