{"title":"MerCruiser 4-Stroke 120-350HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003cp\u003eBuilt for MerCruiser 4‑Stroke 120–350HP sterndrive\/inboard engines, this page helps you quickly find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main MerCruiser collection at any time. Scroll to the bottom of the page to start browsing parts for your engine, and remember you can use the “Filter \u0026amp; Sort” controls on the collection page to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block;padding:10px 14px;border:1px solid #111;border-radius:6px;text-decoration:none;\"\u003eBrowse All MerCruiser Parts\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003ch2\u003eHow to Identify Your 120–350HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eFind the serial plates: engine serial is typically on the starboard side of the block or rocker cover; the sterndrive serial is on the drive’s upper housing; the transom assembly serial is on the gimbal housing.\u003c\/li\u003e\n    \u003cli\u003eRead the model information: look for displacement and induction (e.g., 4.3L carb\/TBI\/MPI, 5.0L, 5.7L, 6.2L; Alpha or Bravo drive). Suffixes may indicate variants and emissions updates.\u003c\/li\u003e\n    \u003cli\u003eDistinguish platforms: V6 (4.3L) vs. small‑block V8 (5.0\/5.7\/6.2). Exhaust manifold\/raiser layout and cylinder count help confirm which family you have.\u003c\/li\u003e\n    \u003cli\u003eNote drive family differences: Alpha units house the raw‑water impeller in the drive; most Bravo packages use an engine‑mounted sea‑water pump. This affects which impeller kit you need.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eV6 4.3L (Alpha\/Bravo)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e90° V6 four‑stroke; common as carb\/TBI and MPI variants; paired with Alpha or Bravo sterndrives.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e4.3L Alpha\/Bravo, 4.3 GEN+, 4.3 EFI\/MPI (typical 175–225 HP packages).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eLight for its output; good fuel economy and mid‑range torque for runabouts and cruisers.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eExhaust manifolds\/risers are V6‑specific. Alpha drives use a drive‑mounted impeller; Bravo packages typically use an engine‑mounted sea‑water pump. Verify by serial before ordering gasket sets.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eV8 Small‑Block 5.0L \/ 5.7L \/ 6.2L (Alpha\/Bravo)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSmall‑block V8 four‑stroke; carb\/TBI\/MPI; widely used with Alpha and Bravo drives.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e5.0L and 5.0 MPI; 5.7L\/350 MAG; 6.2L\/300 HP packages. Popular 220–350 HP range.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eBroad torque for quick planing and towing; strong aftermarket support and parts availability.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eRiser height and outlet angle vary by installation. Many ignition\/charging parts cross families, but exhaust, gaskets and cooling parts are engine‑specific. Confirm Alpha vs. Bravo when selecting impellers and anodes.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"service-kits\" style=\"max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for 4‑stroke MerCruiser packages. Always follow the official service manual and consider severe‑duty intervals if you boat in sandy, silty, or warm waters.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWarm engine fully; verify oil weight per ambient temps; replace drain plug gasket if applicable.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-oil-filters\"\u003eMerCruiser Oil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eGear oil (sterndrive)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eChange from the bottom drain; inspect for water intrusion and metal; replace seals if milky.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-service-maintenance-kits\"\u003eMerCruiser Service \u0026amp; Maintenance Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInspect 100 hrs; replace 300 hrs or 3 yrs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eGap to spec; look for fouling or lean signs; replace if corroded.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eDrain\/replace canister; check for water; purge air after replacement.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-fuel-filters\"\u003eMerCruiser Fuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAnnually or 200 hrs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAlpha: impeller in the drive; Bravo: engine‑mounted sea‑water pump. Replace more often in sandy\/silty water.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-impellers\"\u003eMerCruiser Impellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eAnodes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInspect every 50 hrs; replace when 50% worn\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eMatch alloy to water type (fresh\/aluminum, brackish, salt\/zinc). Ensure solid electrical bonding.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-anodes\"\u003eMerCruiser Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-service-maintenance-kits\"\u003eMerCruiser Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-impellers\"\u003eMerCruiser Impellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-fuel-filters\"\u003eMerCruiser Fuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Charging – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-alternators\"\u003eMerCruiser Alternators\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eExhaust \u0026amp; Manifolds – \u003ca href=\"https:\/\/seasierra.com\/collections\/manifolds\"\u003eManifolds\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers \u0026amp; Hardware – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-propellers\"\u003eMerCruiser Propellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser-anodes\"\u003eMerCruiser Anodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #e5e7eb;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWeak tell‑tale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eInspect sea‑water intake screens for blockage; verify impeller condition; confirm thermostat operation.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eWater pump impeller kit, thermostat, intake screen\/strainer, sea‑water hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eCheck fuel quality and water in separator; inspect spark plugs; verify prop pitch and cavitation.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eFuel filter\/separator, spark plugs, fuel pump, propeller\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eConfirm battery voltage and grounds; check plugs and wires; look for clogged filters or vacuum leaks.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eSpark plugs, starter, fuel filter, intake gaskets\/hoses\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eChange gear lube and inspect; check prop shaft for fishing line; verify u‑joints and gimbal bearing.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 4px;\"\u003eLower unit seal kit, gear lube, prop hardware, bellows, gimbal bearing\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"faq\" style=\"max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable across V6 and V8 or between Alpha and Bravo?\u003c\/summary\u003e\n    \u003cp\u003eSome ignition\/charging parts cross families, but cooling, exhaust, gaskets, and many wear items are engine‑ and drive‑specific. Alpha and Bravo water‑pump setups differ, and exhaust risers\/manifolds are family‑specific. Verify by serial and drive type.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the impeller?\u003c\/summary\u003e\n    \u003cp\u003eAnnually or every 200 hours is a common guideline, sooner if you operate in sandy\/silty water or notice weak flow or overheat warnings.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the sterndrive gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eAt least every 100 hours or annually. If you find milky oil (water intrusion) or metal debris, address seals and internal wear before further use.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eEngine serial number, sterndrive serial, displacement (4.3\/5.0\/5.7\/6.2), induction type (carb\/TBI\/MPI), and drive family (Alpha\/Bravo). Photos of the nameplate and the existing part are also helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1100px;margin:0 auto 18px auto;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main MerCruiser collection to filter down to exactly what fits your engine.\u003c\/p\u003e\n  \u003cp\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercruiser\" style=\"display:inline-block;padding:10px 14px;border:1px solid #111;border-radius:6px;text-decoration:none;\"\u003eShop MerCruiser Parts\u003c\/a\u003e\u003c\/p\u003e\n  \u003cp style=\"font-size:0.95em;color:#374151;\"\u003eIf you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"upper-exhaust-bellow-fits-mercruiser-3-0l-5-7l-v6-v8-replaces-70981a3","title":"Upper Exhaust Bellow for MerCruiser Stern Drives – 3-Inch Riser to 4-Inch Elbow, Replaces Mercury 70981A3","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\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  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\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\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eUpper Exhaust Bellow\u003c\/strong\u003e is a replacement exhaust tube for selected MerCruiser stern drive applications. It is designed for the upper exhaust connection between a \u003cstrong\u003e3-inch center-mounted riser and a 4-inch elbow\u003c\/strong\u003e. The same application information also identifies the rear-mounted riser-to-4-inch Y-pipe configuration.\u003c\/p\u003e\n\u003cp\u003eThis single replacement bellow is listed for MerCruiser Stern Drive models \u003cstrong\u003e470\/485, 898, 228, 250, 260, 280, and 330\u003c\/strong\u003e, as well as \u003cstrong\u003eFord 233\u003c\/strong\u003e applications. The associated V8 application range is identified as 1971–1982; V6 and V8 fitment should be confirmed against the engine and exhaust configuration before ordering.\u003c\/p\u003e\n\u003cp\u003eThe primary manufacturer reference is \u003cstrong\u003eMercury 70981A3\u003c\/strong\u003e. Additional reference numbers listed for this product include Sierra Marine 18-2762, OBR MR-508, Mallory Marine 9-72808, and GLM 89070.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUpper exhaust bellow for marine stern drive exhaust systems.\u003c\/li\u003e\n\u003cli\u003eConnects a 3-inch center-mounted riser to a 4-inch elbow.\u003c\/li\u003e\n\u003cli\u003eAlso identified for a rear-mounted riser to 4-inch Y-pipe configuration.\u003c\/li\u003e\n\u003cli\u003eSold as one bellow; clamps and other installation hardware are not included unless separately stated.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse the references below to compare the replacement part with your existing bellow and engine exhaust configuration. Reference numbers identify listed manufacturer or aftermarket applications; they do not replace a physical fitment check.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n        \u003cth\u003eReference Type\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e70981A3\u003c\/td\u003e\n        \u003ctd\u003ePrimary manufacturer reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e70981A\u003c\/td\u003e\n        \u003ctd\u003eListed manufacturer reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra Marine\u003c\/td\u003e\n        \u003ctd\u003e18-2762\u003c\/td\u003e\n        \u003ctd\u003eAftermarket reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOBR\u003c\/td\u003e\n        \u003ctd\u003eMR-508\u003c\/td\u003e\n        \u003ctd\u003eAftermarket reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory Marine\u003c\/td\u003e\n        \u003ctd\u003e9-72808\u003c\/td\u003e\n        \u003ctd\u003eAftermarket reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e89070\u003c\/td\u003e\n        \u003ctd\u003eAftermarket reference\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe company fitment record lists the following stern drive and engine applications. Model, exhaust layout, and connection dimensions must all match.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel or Engine\u003c\/th\u003e\n        \u003cth\u003eConfiguration\u003c\/th\u003e\n        \u003cth\u003eYear Information\u003c\/th\u003e\n        \u003cth\u003eFitment Notes\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\u003e470 \/ 485\u003c\/td\u003e\n        \u003ctd\u003eStern drive\u003c\/td\u003e\n        \u003ctd\u003eNot specified\u003c\/td\u003e\n        \u003ctd\u003eUpper exhaust bellow application\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e898\u003c\/td\u003e\n        \u003ctd\u003eStern drive\u003c\/td\u003e\n        \u003ctd\u003eNot specified\u003c\/td\u003e\n        \u003ctd\u003eUpper exhaust bellow application\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e228 \/ 250 \/ 260 \/ 280 \/ 330\u003c\/td\u003e\n        \u003ctd\u003eStern drive\u003c\/td\u003e\n        \u003ctd\u003eNot specified\u003c\/td\u003e\n        \u003ctd\u003eUpper exhaust bellow application\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eFord\u003c\/td\u003e\n        \u003ctd\u003e233\u003c\/td\u003e\n        \u003ctd\u003eMarine engine application\u003c\/td\u003e\n        \u003ctd\u003eNot specified\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exhaust connection layout before ordering\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eV8 applications\u003c\/td\u003e\n        \u003ctd\u003e3-inch center-mounted riser to 4-inch elbow, or rear-mounted riser to 4-inch Y-pipe\u003c\/td\u003e\n        \u003ctd\u003e1971–1982 identified for V8 applications\u003c\/td\u003e\n        \u003ctd\u003eConfirm the riser and elbow\/Y-pipe arrangement\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003eV6 and V8 applications\u003c\/td\u003e\n        \u003ctd\u003eUpper exhaust bellow configuration\u003c\/td\u003e\n        \u003ctd\u003eSpecific year range not stated\u003c\/td\u003e\n        \u003ctd\u003eVerify model, exhaust layout, and dimensions\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eUpper exhaust bellow \/ exhaust tube\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eMerCruiser stern drive exhaust system\u003c\/dd\u003e\n  \u003cdt\u003ePrimary Reference\u003c\/dt\u003e\n  \u003cdd\u003eMercury 70981A3\u003c\/dd\u003e\n  \u003cdt\u003eConnection Configuration\u003c\/dt\u003e\n  \u003cdd\u003e3-inch center-mounted riser to 4-inch elbow\u003c\/dd\u003e\n  \u003cdt\u003eAlternate Configuration\u003c\/dt\u003e\n  \u003cdd\u003eRear-mounted riser to 4-inch Y-pipe\u003c\/dd\u003e\n  \u003cdt\u003eProduct Quantity\u003c\/dt\u003e\n  \u003cdd\u003e1 bellow\u003c\/dd\u003e\n  \u003cdt\u003eClamps\u003c\/dt\u003e\n  \u003cdd\u003eNot included\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eNot specified by the product record\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Upper Exhaust Bellow\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eClamps and other installation hardware are not included.\u003c\/strong\u003e Reuse existing hardware only if it is serviceable and appropriate for the installation, or obtain the required hardware separately.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and allow the engine and exhaust components to cool completely.\u003c\/li\u003e\n  \u003cli\u003eConfirm that the replacement bellow matches the existing upper exhaust configuration, including the 3-inch riser and 4-inch elbow or Y-pipe connections.\u003c\/li\u003e\n  \u003cli\u003eGain clear access to the exhaust riser, elbow, and Y-pipe area.\u003c\/li\u003e\n  \u003cli\u003eLoosen and remove the clamps or retaining hardware from the existing bellow.\u003c\/li\u003e\n  \u003cli\u003eRemove the old bellow and inspect the mating surfaces, elbow, riser, Y-pipe, and clamps for corrosion, damage, or distortion.\u003c\/li\u003e\n  \u003cli\u003eClean the mating surfaces and remove debris without damaging the sealing surfaces.\u003c\/li\u003e\n  \u003cli\u003ePosition the new bellow in the same orientation as the original and seat it fully on both connections.\u003c\/li\u003e\n  \u003cli\u003eInstall suitable clamps or retaining hardware separately as required by the engine and exhaust configuration. Tighten according to the engine manufacturer’s service instructions and do not overtighten.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery and run the engine only with an appropriate water supply or on the water.\u003c\/li\u003e\n  \u003cli\u003eCheck carefully for exhaust, water, or cooling leaks before returning the boat to service.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I confirm that this exhaust bellow will fit?\u003c\/summary\u003e\n\u003cp\u003eCompare your existing bellow with the listed references and verify the complete configuration: MerCruiser stern drive model, riser position, elbow or Y-pipe connection, and connection sizes. The primary reference is Mercury 70981A3, with Sierra Marine 18-2762, OBR MR-508, Mallory Marine 9-72808, and GLM 89070 listed as additional references.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this a complete exhaust bellow kit?\u003c\/summary\u003e\n\u003cp\u003eNo. This product is a single upper exhaust bellow. Clamps and other installation hardware are not included.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between an upper exhaust bellow and other bellows?\u003c\/summary\u003e\n\u003cp\u003eThis part is for the upper exhaust tube connection. It should not be confused with a U-joint bellow, shift cable bellow, lower exhaust bellow, or a different-diameter exhaust boot.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are common signs of a failed exhaust bellow?\u003c\/summary\u003e\n\u003cp\u003ePossible signs include exhaust or water leakage, exhaust odor in the engine compartment, unusual exhaust noise, visible cracking or splitting, and deterioration around the connection points. Inspect the surrounding exhaust components as well, since a damaged elbow, Y-pipe, or clamp can produce similar symptoms.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow often should the bellow be inspected?\u003c\/summary\u003e\n\u003cp\u003eInspect the bellow during regular engine and stern drive service and whenever the exhaust system is disturbed. Replace it immediately if it shows cracks, hardening, deformation, separation, or leakage. A fixed replacement interval is not specified for this product.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this an OEM component?\u003c\/summary\u003e\n\u003cp\u003eThis listing is for a replacement bellow associated with Mercury 70981A3 and the additional aftermarket references shown above. It is not presented as a genuine Mercury-branded component.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShipping speed and cost\u003c\/summary\u003e\n\u003cp\u003eStandard shipping is free, with typical transit of 5–15 days. Expedited shipping options are shown at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWarranty and returns\u003c\/summary\u003e\n\u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal use. Returns are accepted within the standard return window when the item is unused and in its original condition. Contact support with your order details for assistance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the part reference, engine or stern drive model, exhaust layout, and connection dimensions before ordering.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on horsepower or model-year similarity alone; different exhaust configurations may use different bellows.\u003c\/li\u003e\n  \u003cli\u003eDo not operate the engine without an appropriate water supply.\u003c\/li\u003e\n  \u003cli\u003eReplace damaged, corroded, or unsuitable clamps and retaining hardware before installation.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when access is restricted or when the exhaust system has corrosion or structural damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Components selected for common marine engine and stern drive service applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGlobal Fulfillment\u003c\/strong\u003e — Standard delivery is available to most regions, with shipping options shown at checkout.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupport When You Need It\u003c\/strong\u003e — Contact support with your engine model, existing part reference, and connection details if you need help confirming fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718266949947,"sku":"17B1014","price":26.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Upper_Exhaust_Bellow_for_MerCruiser_Stern_Drive_30_43_50_57_L_Engines_V6_V8___________70981A3_-_JLM_MARINE-8287798.jpg?v=1762958572"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-4-stroke-120-350hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}