{"product_id":"27-864549a02-exhaust-elbow-riser-gasket-dry-joint-for-mercruiser-jlm-marine","title":"27-864549A02 Exhaust Elbow Riser Gasket Dry Joint for MerCruiser | JLM Marine","description":"\u003ch2\u003eExhaust Elbow Riser Gasket Dry Joint for MerCruiser – 27-864549A02\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003edry joint exhaust elbow riser gasket\u003c\/strong\u003e is engineered for MerCruiser marine engines equipped with closed cooling systems. Designed to fit GM V-6 and V-8 engines (2002 and newer) utilizing dry joint exhaust manifolds, this gasket ensures a reliable seal between the riser and manifold components.\u003c\/p\u003e\n\n\u003cp\u003eThis gasket directly replaces OEM part number \u003cstrong\u003e27-864549A02\u003c\/strong\u003e, \u003cstrong\u003e27-864549A1\u003c\/strong\u003e, and \u003cstrong\u003e27-864549\u003c\/strong\u003e, as well as Sierra part number \u003cstrong\u003e18-0720\u003c\/strong\u003e. It is compatible with MerCruiser engines ranging from 4.3L to 6.2L that use the dry joint manifold and riser configuration with closed cooling.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for \u003cstrong\u003eclosed cooling systems with blocked-off gasket configuration\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFits 4.3L, 5.0L, 5.7L, and 6.2L MerCruiser engines with dry joint exhaust manifolds\u003c\/li\u003e\n\u003cli\u003eDirect replacement for multiple 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\u003eMerCruiser (OEM)\u003c\/td\u003e\n\u003ctd\u003e27-864549A02\u003c\/td\u003e\n\u003ctd\u003ePrimary OEM number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e27-864549A1\u003c\/td\u003e\n\u003ctd\u003eSuperseded by 27-864549A02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e27-864549\u003c\/td\u003e\n\u003ctd\u003eSuperseded by 27-864549A02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-0720\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. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\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\u003eEngine Displacement\u003c\/th\u003e\n\u003cth\u003eYears\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\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003eGM V-6 \u0026amp; V-8\u003c\/td\u003e\n\u003ctd\u003e4.3L, 5.0L, 5.7L, 6.2L\u003c\/td\u003e\n\u003ctd\u003e2002 \u0026amp; newer\u003c\/td\u003e\n\u003ctd\u003eDry joint exhaust manifold with closed cooling system only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\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\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e27-864549A02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasket Type\u003c\/td\u003e\n\u003ctd\u003eDry Joint\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling System\u003c\/td\u003e\n\u003ctd\u003eClosed Cooling (blocked-off configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eExhaust Elbow Riser to Manifold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Engines\u003c\/td\u003e\n\u003ctd\u003eGM V-6 \u0026amp; V-8 (4.3L, 5.0L, 5.7L, 6.2L)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Year\u003c\/td\u003e\n\u003ctd\u003e2002 and newer\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;\"\u003eExhaust Elbow Riser Gasket (Dry Joint) – Qty: 1\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eEnsure the engine is completely cool and disconnect the battery to prevent accidental start-up.\u003c\/li\u003e\n\u003cli\u003eRemove the exhaust elbow riser assembly by loosening and removing all mounting bolts. Support the riser as you work to prevent damage.\u003c\/li\u003e\n\u003cli\u003eCarefully separate the riser from the exhaust manifold and inspect both mating surfaces for corrosion, pitting, or damage.\u003c\/li\u003e\n\u003cli\u003eClean both the manifold and riser mounting surfaces thoroughly using a gasket scraper and appropriate solvent. Remove all old gasket material and debris.\u003c\/li\u003e\n\u003cli\u003eInspect the riser and manifold for cracks or excessive wear; replace components if necessary before proceeding.\u003c\/li\u003e\n\u003cli\u003ePosition the new dry joint gasket onto the exhaust manifold, ensuring all bolt holes and passages are properly aligned.\u003c\/li\u003e\n\u003cli\u003eCarefully place the exhaust elbow riser onto the gasket, aligning all mounting holes. Do not use sealant on dry joint gaskets unless specified by the manufacturer.\u003c\/li\u003e\n\u003cli\u003eInstall mounting bolts finger-tight first to ensure proper alignment and seating of the gasket.\u003c\/li\u003e\n\u003cli\u003eTorque the mounting bolts to manufacturer specifications in a cross-pattern sequence to ensure even clamping pressure.\u003c\/li\u003e\n\u003cli\u003eReconnect the battery and start the engine, allowing it to reach operating temperature while monitoring for exhaust leaks.\u003c\/li\u003e\n\u003cli\u003eInspect all connections and gasket areas for signs of exhaust gas or water leakage during initial operation.\u003c\/li\u003e\n\u003cli\u003eShut down the engine, allow it to cool, and re-check bolt torque after the first heat cycle to ensure proper seating.\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 fits my MerCruiser engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify that your engine is a GM V-6 or V-8 (4.3L, 5.0L, 5.7L, or 6.2L) manufactured in 2002 or later with a dry joint exhaust manifold and closed cooling system. Check your existing gasket part number against 27-864549A02, 27-864549A1, or Sierra 18-0720 for confirmation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between dry joint and wet joint gaskets?\u003c\/strong\u003e\u003cbr\u003e\nA: Dry joint gaskets are used in closed cooling systems where the gasket has a blocked-off design to prevent coolant passage. Wet joint gaskets allow coolant flow and are used in different manifold configurations. Using the wrong type will result in leaks or cooling system failure.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace my exhaust riser gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the gasket any time you remove the exhaust elbow riser for service or repair. Gaskets are single-use components that compress during installation and should not be reused. Inspect the gasket annually for signs of deterioration, especially in saltwater environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse this gasket if I need to remove the riser again?\u003c\/strong\u003e\u003cbr\u003e\nA: No, exhaust gaskets should never be reused. Once compressed and exposed to heat cycles, the gasket material loses its ability to seal properly, which can lead to exhaust leaks and potential engine damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs of a failing exhaust riser gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include visible exhaust leaks (smoke or soot) around the riser-to-manifold junction, hissing sounds during operation, reduced engine performance, and in severe cases, water intrusion into the exhaust system or engine overheating.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM or aftermarket part?\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":51981020594489,"sku":"24GK115","price":36.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/24GK115.webp?v=1772456019","url":"https:\/\/jlmmarine.com\/products\/27-864549a02-exhaust-elbow-riser-gasket-dry-joint-for-mercruiser-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}