{"title":"MerCruiser 4-Stroke 150-225HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e5e7eb;border-radius:8px;max-width:1000px;\"\u003e\n  \u003cp\u003eThis page is for MerCruiser 4-Stroke 150–225HP outboard engines. It helps you find compatible parts and key service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection and, at the bottom of this page, start browsing parts for this engine. On the collection page, use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;margin-top:8px;padding:10px 14px;background:#0d6efd;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All Mercury Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px;max-width:1000px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 150–225HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the serial\/nameplate tag on the swivel bracket or clamp bracket. Record the full serial number before ordering parts.\u003c\/li\u003e\n    \u003cli\u003eModel codes and suffixes can indicate shaft length (L\/XL\/XXL), steering\/control type, and sometimes market variant (e.g., commercial\/SeaPro).\u003c\/li\u003e\n    \u003cli\u003eConfirm platform: many 150HP models are Inline‑4 EFI 4‑Stroke; 175–225HP models are typically V6 EFI 4‑Stroke. Parts can differ between platforms and by serial range.\u003c\/li\u003e\n    \u003cli\u003eAlways verify parts by serial number; some service items overlap with other Mercury FourStroke families, but not all.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px;max-width:1000px;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003e150 FourStroke (Inline‑4 EFI)\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\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eInline‑4, EFI, 4‑Stroke; designed for quiet operation, strong mid‑range torque, and efficient fuel burn.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e150 FourStroke (L\/XL\/XXL) and select commercial\/SeaPro variants in some markets.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eSmooth running, good fuel economy, straightforward routine service.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eSome service parts interchange with other Mercury FourStroke families; confirm by serial to ensure the correct fit.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e175–225 FourStroke (V6 EFI)\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\u003eConfiguration\u003c\/td\u003e\n        \u003ctd\u003eV6, EFI, 4‑Stroke platform commonly used for 175\/200\/225HP models.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCommon Models\u003c\/td\u003e\n        \u003ctd\u003e175 FourStroke, 200 FourStroke, 225 FourStroke (standard and select SeaPro variants by market).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAdvantages\u003c\/td\u003e\n        \u003ctd\u003eStrong acceleration and mid‑range torque with refined NVH characteristics.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eNotes\u003c\/td\u003e\n        \u003ctd\u003eService items (filters, anodes, belts) may differ from the 150 I‑4; always match by serial range and variant.\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=\"padding:16px;max-width:1000px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for typical recreational use. Always follow the official service manual for your specific serial range and operating conditions.\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\u003eEngine oil + filter\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd\u003eUse marine 4‑stroke oil meeting FC‑W spec; replace the oil filter at each oil change.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\" style=\"text-decoration:underline;\"\u003eOil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd\u003eInspect for water intrusion or metal debris; pressure test and reseal if contamination is found.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\" style=\"text-decoration:underline;\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd\u003eInspect at 100 hours; replace ~200–300 hours\u003c\/td\u003e\n        \u003ctd\u003eCheck gap and condition; replace sooner if fouling, misfire, or hard starting occurs.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\" style=\"text-decoration:underline;\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd\u003eShorten interval with ethanol fuel or if tanks are contaminated.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\" style=\"text-decoration:underline;\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd\u003eEvery 2–3 seasons (or ~200 hours)\u003c\/td\u003e\n        \u003ctd\u003eReplace sooner for sandy\/silty conditions or a weak telltale stream.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\" style=\"text-decoration:underline;\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAnodes (corrosion protection)\u003c\/td\u003e\n        \u003ctd\u003eInspect every 50–100 hours; replace at ~50% depletion\u003c\/td\u003e\n        \u003ctd\u003eUse aluminum for salt\/brackish and magnesium for freshwater-only applications per OEM guidance.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\" style=\"text-decoration:underline;\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSerpentine \/ accessory belt\u003c\/td\u003e\n        \u003ctd\u003eInspect every 100 hours\u003c\/td\u003e\n        \u003ctd\u003eReplace if cracked, glazed, noisy, or contaminated with oil\/coolant.\u003c\/td\u003e\n        \u003ctd\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\" style=\"text-decoration:underline;\"\u003eBelts\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=\"padding:16px;max-width:1000px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service – \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\" style=\"text-decoration:underline;\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\" style=\"text-decoration:underline;\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\" style=\"text-decoration:underline;\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\" style=\"text-decoration:underline;\"\u003eElectrical Items\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\" style=\"text-decoration:underline;\"\u003eSpark Plugs\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection – \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\" style=\"text-decoration:underline;\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropulsion – \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\" style=\"text-decoration:underline;\"\u003ePropellers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/propeller-guards\" style=\"text-decoration:underline;\"\u003ePropeller Guards\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \/ Seals – \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\" style=\"text-decoration:underline;\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px;max-width:1000px;\"\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\u003eWeak telltale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd\u003eInspect intake screens for debris; verify impeller condition; confirm thermostat operation.\u003c\/td\u003e\n        \u003ctd\u003eWater pump kit, thermostat(s), intake screen, anodes\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd\u003eCheck prop condition and pitch; verify fuel quality; replace clogged filters; inspect spark plugs.\u003c\/td\u003e\n        \u003ctd\u003ePropeller, fuel filter, spark plugs, injectors\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd\u003eConfirm battery voltage and connections; look for stale fuel; check plugs and air leaks.\u003c\/td\u003e\n        \u003ctd\u003eSpark plugs, fuel filter, sensors, IAC components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd\u003eVerify correct oil level; check for water intrusion; pressure test and inspect seals\/bearings.\u003c\/td\u003e\n        \u003ctd\u003eLower unit seal kit, bearings, gear lube\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCharging issues (low system voltage)\u003c\/td\u003e\n        \u003ctd\u003eInspect belt tension\/condition; test rectifier\/regulator and wiring connections.\u003c\/td\u003e\n        \u003ctd\u003eSerpentine belt, rectifier\/regulator, electrical connectors\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=\"padding:16px;max-width:1000px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between different years or platforms?\u003c\/summary\u003e\n    \u003cp\u003eMany service items are shared, but changes occur within serial ranges and between platforms (Inline‑4 vs. V6). Always confirm by serial number before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the water pump impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, every 2–3 seasons or about 200 hours. Replace sooner if you run in sand\/silt frequently or if the telltale weakens or the engine overheats.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should the lower unit gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eTypically every 100 hours or annually. If you see milky oil, metal shavings, or leakage, change it immediately and inspect seals and bearings.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the engine’s full serial number, horsepower, approximate model year, and any suffix (L\/XL\/XXL or SeaPro). Photos of the nameplate and the part to be replaced are also helpful.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px;max-width:1000px;border-top:1px solid #e5e7eb;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main Mercury outboard collection and use Filter \u0026amp; Sort to zero in on your engine.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;margin:8px 0 6px 0;padding:10px 14px;background:#0d6efd;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop Mercury Outboard Parts\u003c\/a\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":"exhaust-water-shutter-assembly-fits-mercruiser-diesel-3-0l-3-6l-4-2l-engines-replaces-807166a3","title":"2-Piece Exhaust Water Shutter Set for MerCruiser Stern Drive Applications – Replaces 807166A3","description":"\u003csection\u003e\n\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 { padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top; }\n  table.ss-table th { white-space:nowrap; word-break:normal; letter-spacing:normal; font-weight:600; background:#f8fafc; }\n  @media (max-width:480px){ table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; } }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e2-piece exhaust water shutter set\u003c\/strong\u003e is designed for MerCruiser stern drive and outdrive applications. The flexible shutter acts as a check valve in the exhaust system, helping prevent water from returning through the exhaust passage toward the engine.\u003c\/p\u003e\n\u003cp\u003eThe shutters use a \u003cstrong\u003e2.50-inch cross-pin diameter\u003c\/strong\u003e and are intended for installation in the matching exhaust water-shutter location. Always compare the original shutter and cross-pin dimensions before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTwo exhaust water shutters supplied as one pair.\u003c\/li\u003e\n  \u003cli\u003eFlexible check-valve design helps limit water return through the exhaust.\u003c\/li\u003e\n  \u003cli\u003eFor MerCruiser stern drive and outdrive applications.\u003c\/li\u003e\n  \u003cli\u003eAftermarket replacement for the applicable original exhaust water shutter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number References\u003c\/h2\u003e\n\u003cp\u003eThese references are provided for identification and cross-reference purposes. Confirm the original part, application, and dimensions before installation.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number References\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n\u003cth\u003eBrand or Reference\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\u003eMercury Marine reference\u003c\/td\u003e\n\u003ctd\u003e807166A3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003ctd\u003e18-2732\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra Marine\u003c\/td\u003e\n\u003ctd\u003e18-2732-9\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory Marine\u003c\/td\u003e\n\u003ctd\u003e9-42802\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e89170\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eApplication Information\u003c\/h2\u003e\n\u003cp\u003eThis product is listed for \u003cstrong\u003eMerCruiser stern drive and outdrive water-shutter applications\u003c\/strong\u003e. The available product information does not establish a complete model, horsepower, year, serial-number, or fuel-type range. Use the reference number and dimensional check below to confirm compatibility.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Application Information\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEngine or drive brand\u003c\/td\u003e\n\u003ctd\u003eMerCruiser\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eDrive location\u003c\/td\u003e\n\u003ctd\u003eStern drive \/ outdrive\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eComponent\u003c\/td\u003e\n\u003ctd\u003eExhaust water shutter \/ flapper valve\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCross-pin diameter\u003c\/td\u003e\n\u003ctd\u003e2.50 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eReference replacement number\u003c\/td\u003e\n\u003ctd\u003e807166A3\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\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eExhaust water shutter pair\u003c\/dd\u003e\n  \u003cdt\u003eFunction\u003c\/dt\u003e\n  \u003cdd\u003eFlexible check valve that helps stop water from returning up the exhaust system toward the engine\u003c\/dd\u003e\n  \u003cdt\u003eQuantity\u003c\/dt\u003e\n  \u003cdd\u003e2 shutters\u003c\/dd\u003e\n  \u003cdt\u003eInstallation Location\u003c\/dt\u003e\n  \u003cdd\u003eMatching exhaust water-shutter position in the stern drive or outdrive exhaust system\u003c\/dd\u003e\n  \u003cdt\u003eCross-Pin Diameter\u003c\/dt\u003e\n  \u003cdd\u003e2.50 inches\u003c\/dd\u003e\n  \u003cdt\u003ePart Type\u003c\/dt\u003e\n  \u003cdd\u003eAftermarket replacement\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e2 x Exhaust water shutter assemblies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Mounting grommets and other installation hardware are not identified as included in the company product record.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and allow the engine and exhaust system to cool completely.\u003c\/li\u003e\n  \u003cli\u003eLocate the exhaust water-shutter position in the stern drive or outdrive exhaust assembly.\u003c\/li\u003e\n  \u003cli\u003eRemove the worn shutters carefully, avoiding damage to the surrounding exhaust components.\u003c\/li\u003e\n  \u003cli\u003eClean the mounting area and inspect the cross-pin holes and surrounding parts for corrosion, damage, or distortion.\u003c\/li\u003e\n  \u003cli\u003eCompare the replacement shutters with the original parts, including the 2.50-inch cross-pin dimension.\u003c\/li\u003e\n  \u003cli\u003eInstall the two shutters in the correct orientation and confirm that each shutter moves freely without binding.\u003c\/li\u003e\n  \u003cli\u003eReassemble the exhaust components according to the engine or drive manufacturer’s service procedure.\u003c\/li\u003e\n  \u003cli\u003eAfter installation, run the engine according to the applicable service procedure and check for abnormal exhaust noise, water leaks, or restricted movement.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm that this water shutter fits?\u003c\/summary\u003e\n  \u003cp\u003eConfirm that your application is a MerCruiser stern drive or outdrive exhaust water-shutter application, then compare the original part, the 807166A3 reference, and the 2.50-inch cross-pin diameter. Model, year, serial-number, and drive-specific fitment should be verified before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat does the exhaust water shutter do?\u003c\/summary\u003e\n  \u003cp\u003eThe flexible shutter acts as a check valve in the exhaust system. Its purpose is to help prevent water from traveling back through the exhaust passage toward the engine.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this sold as one shutter or a pair?\u003c\/summary\u003e\n  \u003cp\u003eThis product is supplied as a pair of two exhaust water shutters. It is not listed as a complete hardware kit, and mounting grommets are not identified as included.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM component?\u003c\/summary\u003e\n  \u003cp\u003eNo. This is an aftermarket replacement part. The listed manufacturer references are provided for identification and compatibility cross-reference only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShould I replace both shutters at the same time?\u003c\/summary\u003e\n  \u003cp\u003eBecause this product is supplied as a pair, replacing both matching shutters together can help maintain consistent operation. Inspect the surrounding exhaust components and mounting points during installation.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the original part number, application, and 2.50-inch cross-pin dimension before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on engine displacement, horsepower, year, or brand alone to determine fitment.\u003c\/li\u003e\n  \u003cli\u003eInspect the exhaust system for corrosion or damage before installing replacement shutters.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended when access to the exhaust assembly is limited or when water-ingestion risk is involved.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — We supply replacement components for marine engine and drive systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Information\u003c\/strong\u003e — Product references and dimensions are provided to support compatibility checks.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePractical Replacement Solutions\u003c\/strong\u003e — Designed to help restore the intended function of serviceable marine components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723781902651,"sku":"17ST005","price":34.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/17ST0051_8801f17a-0fdf-4ea3-bb26-eb409e787e21.jpg?v=1763031655"}],"url":"https:\/\/seasierra.com\/collections\/mercruiser-4-stroke-150-225hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}