{"product_id":"728170-92600-power-head-gasket-set-for-yanmar-1gm-jlm-marine","title":"728170-92600 Power Head Gasket Set for Yanmar 1GM | JLM Marine","description":"\u003ch2\u003ePower Head Gasket Set – Fits Yanmar 1GM 7 HP Marine Engine\u003c\/h2\u003e\n\n\u003cp\u003eThis professional-grade Power Head Gasket Set is engineered for Yanmar 1GM 7 HP marine engines, delivering a reliable seal for your power head assembly. Designed to meet the demanding requirements of marine environments, this gasket set ensures optimal compression and prevents fluid leaks during engine operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect Replacement for:\u003c\/strong\u003e Yanmar Marine Part Number 728170-92600 (with 128170-01331) and Sierra Marine Part Number 18-55500.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eComplete power head gasket set for comprehensive sealing\u003c\/li\u003e\n  \u003cli\u003ePrecision-cut gaskets for proper fitment and performance\u003c\/li\u003e\n  \u003cli\u003eSuitable for routine maintenance and engine rebuilds\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\"\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 Marine\u003c\/td\u003e\n      \u003ctd\u003e728170-92600\u003c\/td\u003e\n      \u003ctd\u003eIncludes 128170-01331\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra Marine\u003c\/td\u003e\n      \u003ctd\u003e18-55500\u003c\/td\u003e\n      \u003ctd\u003eAftermarket equivalent\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\"\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 Marine\u003c\/td\u003e\n      \u003ctd\u003e1GM\u003c\/td\u003e\n      \u003ctd\u003e7 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\"\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\u003eMarine Diesel Engine\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Reference\u003c\/td\u003e\n      \u003ctd\u003e728170-92600\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\u003eYour package includes:\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 set with all necessary gaskets for power head assembly)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePreparation:\u003c\/strong\u003e Disconnect the battery and allow the engine to cool completely. Gather all necessary tools including torque wrench, scraper, and cleaning solvent.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisassembly:\u003c\/strong\u003e Remove the cylinder head following your engine's service manual specifications. Keep all fasteners organized for reassembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Cleaning:\u003c\/strong\u003e Thoroughly clean all mating surfaces using a gasket scraper and solvent. Ensure no old gasket material, carbon deposits, or debris remain.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInspection:\u003c\/strong\u003e Inspect cylinder head and block surfaces for warping, cracks, or damage. Use a straightedge to verify flatness; resurface if necessary.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGasket Positioning:\u003c\/strong\u003e Position the new head gasket on the engine block, aligning all bolt holes and water passages correctly. Do not use additional sealant unless specified by manufacturer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHead Installation:\u003c\/strong\u003e Carefully lower the cylinder head onto the block, ensuring gasket alignment is maintained. Install all head bolts finger-tight initially.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTorque Sequence:\u003c\/strong\u003e Tighten head bolts following the manufacturer's specified sequence and torque values in multiple stages. Use a calibrated torque wrench for accuracy.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemaining Gaskets:\u003c\/strong\u003e Install remaining gaskets from the set according to their designated positions (exhaust, intake, covers, etc.). Replace all sealing surfaces simultaneously.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReassembly:\u003c\/strong\u003e Reconnect all components, hoses, and electrical connections removed during disassembly. Double-check all fasteners are properly tightened.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFluid Refill:\u003c\/strong\u003e Refill engine coolant and oil to proper levels. Check for correct fluid types per manufacturer specifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInitial Start:\u003c\/strong\u003e Start the engine and allow it to reach operating temperature while monitoring for leaks. Check coolant and oil levels after initial run.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRe-torque:\u003c\/strong\u003e After the first heat cycle, consider re-torquing head bolts per manufacturer recommendations. Monitor engine performance during break-in period.\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 1GM engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine model number stamped on the engine block or data plate. Cross-reference the OEM part number 728170-92600 with your engine's parts manual to ensure compatibility before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the power head gasket set?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace gaskets whenever the cylinder head is removed for service, repairs, or overhaul. Gaskets are single-use components and should never be reused, as they lose their sealing ability once compressed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my power head gaskets are failing?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include coolant leaks around the cylinder head, white smoke from exhaust (coolant burning), oil contamination in coolant or vice versa, overheating, loss of compression, and rough engine performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gaskets if they look intact?\u003c\/strong\u003e\u003cbr\u003e\nA: No, never reuse gaskets. Once compressed during initial installation, gaskets conform to surface irregularities and lose their ability to seal properly if removed and reinstalled, even if they appear undamaged.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Do I need to apply sealant to these gaskets during installation?\u003c\/strong\u003e\u003cbr\u003e\nA: Typically, no additional sealant is required unless specifically called for in your engine's service manual. Modern gaskets are designed to seal properly when installed on clean, flat surfaces with correct torque specifications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\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":51980999655737,"sku":"23GK294","price":100.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_8d87ef2a-7967-4bff-8806-d06c389f2af2.jpg?v=1772414117","url":"https:\/\/jlmmarine.com\/es\/products\/728170-92600-power-head-gasket-set-for-yanmar-1gm-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}