{"product_id":"exhaust-manifold-bellow-fits-mercruiser-120-140-3-0l-4-cylinder-various-v6-v8-models-replaces-70981a3-90949t","title":"Exhaust Manifold Bellow – Fits MerCruiser 120\/140\/3.0L 4-Cylinder \u0026 Various V6\/V8 Models (Replaces 70981A3, 90949T)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eExhaust Manifold Bellow 70981A3 – Fits MerCruiser 120\/140\/3.0L 4-Cylinder \u0026amp; Various V6\/V8 Models\u003c\/strong\u003e is a crucial component for connecting the upper exhaust manifold to the elbow. It is designed specifically for MerCruiser 4-cylinder, V6, and V8 engines with wet joint exhaust systems manufactured between 1982 and 2002.\u003c\/p\u003e\n\u003cp\u003eThis part serves as a direct replacement for MerCruiser 70981A3, Sierra 18-2762, GLM 89070, Mallory 9-72808, Quicksilver 70981A3, and others.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConnects the 3-inch center mounted riser to the 4-inch exhaust elbow.\u003c\/li\u003e\n  \u003cli\u003eConstructed from durable CR (Chloroprene) rubber for longevity in marine environments.\u003c\/li\u003e\n  \u003cli\u003eDesigned for use in \"wet joint\" exhaust systems common in pre-2002 MerCruiser models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Cross-Reference\"\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\u003e70981A3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e90949T\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e27-92720\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eQuicksilver\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-2762\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e89070\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory\u003c\/td\u003e\n        \u003ctd\u003e9-72808\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGHmarine\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNorthBoat\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSoxaMarine\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model and year in the table below.\u003c\/p\u003e\n\u003cp\u003eThis bellow is designed for MerCruiser engines utilizing a \"wet joint\" exhaust system, typically found in models from 1982 to 2002.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Compatible Engine Models for MerCruiser\"\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        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\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\u003e120\/140 - Inline 4\u003c\/td\u003e\n        \u003ctd\u003e120–140\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1982–1995\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003eFor 153\/181 CID, wet joint models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e2.5L\/3.0L\u003c\/td\u003e\n        \u003ctd\u003e120–140\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1987–1995\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003eModels with wet joint exhaust\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e175-205 - V6\u003c\/td\u003e\n        \u003ctd\u003e175–205\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1983–2002\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003eGM 229\/262 CID, wet joint models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e200-320 - V8 S.B.\u003c\/td\u003e\n        \u003ctd\u003e200–320\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1983–2002\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003eGM 305\/350\/377 CID, wet joint models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e330-370 - V8 B.B.\u003c\/td\u003e\n        \u003ctd\u003e330–370\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1981–2002\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003eGM 454\/502 CID, wet joint models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e470\/485\u003c\/td\u003e\n        \u003ctd\u003e170–190\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1983–1989\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003e224 CID, wet joint models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e898, 228, 250, 260, 280\u003c\/td\u003e\n        \u003ctd\u003eVaries\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1983–2002\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003eVarious models with wet joint exhaust\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eExhaust Bellow \/ Exhaust Boot\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eUpper Exhaust Manifold to Elbow Connection\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003e3-inch Center Mounted Riser to 4-inch Elbow\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eCR (Chloroprene) Rubber Bellow\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003e3-inch to 4-inch diameter transition\u003c\/dd\u003e\n  \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eHose with Clamp Connection\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer (1 Year for GHmarine)\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eUsed with 2-piece exhaust elbow in wet joint applications\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Exhaust Bellow\/Boot (70981A3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the engine is off and has cooled completely. Disconnect the boat's battery.\u003c\/li\u003e\n  \u003cli\u003eDrain the exhaust system to prevent water spills.\u003c\/li\u003e\n  \u003cli\u003eLocate the exhaust bellow connecting the manifold riser to the exhaust elbow.\u003c\/li\u003e\n  \u003cli\u003eLoosen and remove the two hose clamps securing the old bellow.\u003c\/li\u003e\n  \u003cli\u003eCarefully slide the old bellow off both the riser and elbow connections.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean the connection surfaces on the riser and elbow to ensure a proper seal.\u003c\/li\u003e\n  \u003cli\u003eSlide the new bellow into position, ensuring it is fully seated on both ends.\u003c\/li\u003e\n  \u003cli\u003ePosition the new hose clamps over the bellow and tighten them securely according to manufacturer specifications. Do not overtighten.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and carefully inspect for any exhaust or water leaks around the new bellow.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow can I confirm this bellow fits my specific engine?\u003c\/summary\u003e\n  \u003cp\u003eFirst, check your engine model and year against the compatibility table above. This bellow is designed for MerCruiser models from 1982–2002 with a \"wet joint\" exhaust system. If your engine is newer than 2002, it likely uses a \"dry joint\" system and this part will not fit.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between a \"wet joint\" and \"dry joint\" exhaust?\u003c\/summary\u003e\n  \u003cp\u003eA \"wet joint\" exhaust system allows cooling water to pass through the gasket area between the manifold and elbow. A \"dry joint\" system, introduced by MerCruiser after 2002, keeps cooling water separate from the exhaust gas passage at this joint. This bellow is only for wet joint applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing exhaust bellow?\u003c\/summary\u003e\n  \u003cp\u003eCommon symptoms include visible cracks or perishing on the rubber, water leaking from the joint between the manifold and elbow (especially when the engine is running), rust stains in this area, or the smell of exhaust fumes in the engine compartment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should this part be replaced?\u003c\/summary\u003e\n  \u003cp\u003eIt is recommended to inspect the exhaust bellows annually for signs of wear, cracking, or stiffness. Replacement should be part of routine exhaust system maintenance every 5-7 years, or immediately if any damage or leaking is detected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part or an aftermarket one?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is for an aftermarket replacement part, not an original equipment manufacturer (OEM) component. It has been engineered to meet or exceed OEM specifications using comparable materials and is manufactured in an ISO 9002 certified facility with batch inspections to ensure quality.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the shipping costs and delivery times?\u003c\/summary\u003e\n  \u003cp\u003eWe offer fast worldwide shipping, with typical transit times of 5–15 days for most regions. Standard shipping is free. Expedited shipping options, if available for your location, will be presented at checkout.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original packaging. Please see our full policy page or contact us for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images and specifications against your original part before purchasing. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an OEM part.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is highly recommended for safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world marine conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — We offer free standard delivery to most regions, with typical transit times of 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718266032443,"sku":"24MFK117-NB","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/24MFK117-NB.png?v=1762958539","url":"https:\/\/seasierra.com\/products\/exhaust-manifold-bellow-fits-mercruiser-120-140-3-0l-4-cylinder-various-v6-v8-models-replaces-70981a3-90949t","provider":"SeaSierra","version":"1.0","type":"link"}