{"title":"Mercury Mariner 2-Stroke 4HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"max-width:980px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003cp\u003eThis page focuses on Mercury\/Mariner 2‑Stroke 4HP outboard engines. Use it to find compatible parts and service information, including maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Mercury collection for a wider selection of components. Scroll to the bottom of this page to start browsing parts for this engine, and use the Filter \u0026amp; Sort controls on the collection page to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;margin-top:8px;padding:8px 14px;border:1px solid #1a1a1a;border-radius:4px;text-decoration:none;\"\u003eBrowse All Mercury Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"max-width:980px;margin:0 auto;padding:8px 12px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 4HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate\/serial plate: Typically on the transom clamp bracket (port side). The stamped serial may also appear on a core plug on the powerhead.\u003c\/li\u003e\n    \u003cli\u003eModel code \u0026amp; suffix: Letters often indicate shaft length (S=15, L=20) and start\/controls (M=manual start, EL=electric start). Record the full code and serial to confirm parts.\u003c\/li\u003e\n    \u003cli\u003ePlatform hints: These small 2‑stroke 4HP units are carbureted, rope-start, and water‑cooled. Some Mariner variants share Yamaha‑sourced powerheads; verify by serial before ordering gaskets and cooling parts.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"max-width:980px;margin:0 auto;padding:8px 12px;\"\u003e\n  \u003ch2\u003eEngine Overview\u003c\/h2\u003e\n  \u003ch3\u003eMercury\/Mariner 4HP 2‑Stroke Portable\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 #ddd;padding:6px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:6px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eSingle‑cylinder, carbureted 2‑stroke; tiller steer; manual (rope) start; water‑cooled.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eMercury\/Mariner 4HP 2‑Stroke short (S) and long (L) shaft variants; some Mariner 4HP units were Yamaha‑built and share many service parts.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eVery light and simple; easy to service; good low‑speed control for dinghies and tenders.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eCooling system maintenance (impeller, gaskets, thermostat) is critical. Some gaskets\/thermostats and hardware cross‑reference with Yamaha patterns on Mariner‑branded units—use the serial plate to verify compatibility before ordering.\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:980px;margin:0 auto;padding:8px 12px;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for small 2‑stroke outboards. Always follow the official service manual for your exact model and usage.\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 #ddd;padding:6px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:6px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:6px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:6px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eInspect for water intrusion (milky oil). Replace seals if leaks are found.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eEvery 100 hours or each season\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eCheck gap and color; replace if fouled or worn. Use heat range specified by the manual.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\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;border-bottom:1px solid #eee;\"\u003eInline fuel filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eEvery 100 hours or each season\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eReplace more often if using portable tanks or if debris\/water is present.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eWater pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eAnnually or every 2 seasons\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eReplace sooner after an overheat, sand\/silt use, or dry running. Vital for cooling.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eAnodes (sacrificial)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eInspect every 50 hours; replace when 50% consumed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eChoose alloy for your water type (fresh\/brackish\/salt). Maintain good electrical contact.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eThermostat (inspection\/replacement)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eEvery 2–3 years\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eStuck thermostats cause cold‑running or overheat issues. Verify type by serial.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\"\u003eMercury Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e2‑Stroke fuel\/oil premix\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eEvery refuel\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eUse TC‑W3 outboard oil at the ratio specified by your manual (many 4HP models use 50:1). Mix thoroughly.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\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:980px;margin:0 auto;padding:8px 12px;\"\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\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System (Impeller \u0026amp; Pump)  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-water-pump-repair-kits\"\u003eMercury Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition  \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System  \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-lower-unit-seal-kits\"\u003eMercury Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers  \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection  \u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"max-width:980px;margin:0 auto;padding:8px 12px;\"\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 #ddd;padding:6px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:6px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;padding:6px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eWeak tell‑tale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eInspect intake screen for debris; verify impeller condition and housing; test thermostat.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eWater pump kit\/impeller, thermostat, gaskets, intake screen\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eCheck prop condition and pitch; confirm fuel quality and venting; clean carburetor jets; verify plug condition.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003ePropeller, fuel filter, spark plugs, carburetor service parts\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eConfirm choke\/enrichment operation; inspect for air leaks in fuel lines; verify spark and plug gap; drain stale fuel.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eSpark plugs, fuel filter, fuel pump diaphragm, carburetor kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eExcessive smoke (2‑Stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eVerify premix ratio; warm engine fully; adjust idle mixture per manual.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eSpark plugs, carburetor jets\/needle, reed valve inspection\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eGearcase noise or metal in gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eCheck oil level\/condition; inspect for water intrusion at seals; verify prop shaft straightness.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px;border-bottom:1px solid #eee;\"\u003eGear oil, lower unit seal kit, bearings\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:980px;margin:0 auto;padding:8px 12px;\"\u003e\n  \u003ch2\u003eFAQs\u003c\/h2\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eAre parts interchangeable between Mercury and Mariner 4HP 2‑Stroke models?\u003c\/summary\u003e\n    \u003cp\u003eSome Mariner 4HP units were built with Yamaha‑sourced components, so many items (gaskets, thermostat, hardware, spark plugs) may cross‑reference. Always confirm by serial\/model number before ordering.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the impeller?\u003c\/summary\u003e\n    \u003cp\u003eAs preventive maintenance, replace the impeller annually or every 100 hours (whichever comes first). Replace immediately after any overheat event, dry running, or use in sandy\/silty water.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should lower unit gear oil be changed?\u003c\/summary\u003e\n    \u003cp\u003eChange gear oil at least once per season or every 100 hours. If the oil looks milky (water contamination) or has metal debris, service the seals and inspect internal components.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003ePlease provide the full model and serial number from the nameplate, shaft length (S\/L), start type (manual\/electric), and clear photos of the part or area of the engine. This ensures we match the correct platform and revisions.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"max-width:980px;margin:0 auto;padding:16px 12px;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse the main Mercury collection and use Filter \u0026amp; Sort to quickly narrow to your 4HP 2‑Stroke.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/mercury-outboard-parts\" style=\"display:inline-block;margin-top:6px;padding:8px 14px;border:1px solid #1a1a1a;border-radius:4px;text-decoration:none;\"\u003eShop Mercury Outboard Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#444;\"\u003eIf youre unsure about your model, send us a photo of the nameplate and the part you need and well help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"water-pump-impeller-kit-fits-mercury-mariner-2-stroke-3-5-9-8-hp-replaces-47-89980t1-47-89980q1","title":"Water Pump Impeller Kit – Fits Mercury Mariner 2-Stroke 3.5–9.8 HP (Replaces 47-89980T1, 47-89980Q1)","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\u003ewater pump impeller kit\u003c\/strong\u003e is designed for selected Mercury and Mariner 2-stroke outboard motors in the 3.5–9.8 HP range, including 3.5 HP, 3.6 HP, 3.9 HP, 4 HP, 4.5 HP, 7.5 HP, and 9.8 HP models manufactured during the listed model years. Please verify the exact model, year, serial number, and impeller dimensions before ordering.\u003c\/p\u003e\n\u003cp\u003eThe kit is listed as a replacement for Mercury references including \u003cstrong\u003e47-89980T1\u003c\/strong\u003e, \u003cstrong\u003e47-89980Q1\u003c\/strong\u003e, \u003cstrong\u003e89980\u003c\/strong\u003e, \u003cstrong\u003e89980B\u003c\/strong\u003e, and \u003cstrong\u003e68988\u003c\/strong\u003e, as well as aftermarket references such as Sierra \u003cstrong\u003e18-3054\u003c\/strong\u003e, GLM \u003cstrong\u003e12270\u003c\/strong\u003e, and CEF \u003cstrong\u003e500314\u003c\/strong\u003e. These references should be used for cross-checking only; always compare the original part and engine serial number.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls in the lower unit water pump to restore cooling-water circulation.\u003c\/li\u003e\n\u003cli\u003eIncludes a neoprene impeller and stainless steel wear plate for dependable service.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCritical fitment note:\u003c\/strong\u003e This kit uses a 0.438 in (11.1 mm) impeller inside diameter. Measure the existing impeller or driveshaft before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse these references to cross-check the replacement part across OEM and aftermarket catalogs.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\u003ctable class=\"ss-table\" aria-label=\"Part Number Interchange References\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e47-89980Q1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e89980\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e89980B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e68988\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3054\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e12270\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCEF\u003c\/td\u003e\n\u003ctd\u003e500314\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe following model and year information is provided as a compatibility guide. Confirm the engine model, production origin, serial number, and impeller dimensions before ordering.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\u003ctable class=\"ss-table\" aria-label=\"Compatible Mercury and Mariner Models\"\u003e\n\u003cthead\u003e\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\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e3.5 HP\u003c\/td\u003e\n\u003ctd\u003e3.5\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1983–1985\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e3.6 HP\u003c\/td\u003e\n\u003ctd\u003e3.6\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980–1982\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e3.9 HP\u003c\/td\u003e\n\u003ctd\u003e3.9\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1979–1985\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1982–1986\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e4 HP (40), 2 cylinder\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980–1981\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e4.5 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e4.5\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1980–1985\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e7.5 HP\u003c\/td\u003e\n\u003ctd\u003e7.5\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1979–1986\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003e9.8 HP\u003c\/td\u003e\n\u003ctd\u003e9.8\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1979–1985\u003c\/td\u003e\n\u003ctd\u003e47-89980T1\u003c\/td\u003e\n\u003ctd\u003e0.438 in impeller I.D.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch3\u003eSerial Number Compatibility\u003c\/h3\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\u003ctable class=\"ss-table\" aria-label=\"Compatible Serial Number Ranges\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eOrigin\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSerial Range\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSA Made\u003c\/td\u003e\n\u003ctd\u003e9.8 HP\u003c\/td\u003e\n\u003ctd\u003e5206550 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSA Made\u003c\/td\u003e\n\u003ctd\u003e7.5 HP\u003c\/td\u003e\n\u003ctd\u003e5206550 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSA Made\u003c\/td\u003e\n\u003ctd\u003e4.5 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e5595532 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUSA Made\u003c\/td\u003e\n\u003ctd\u003e4 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e5595532–0A809600\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBEL Made\u003c\/td\u003e\n\u003ctd\u003e9.8 HP\u003c\/td\u003e\n\u003ctd\u003e9217756 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBEL Made\u003c\/td\u003e\n\u003ctd\u003e7.5 HP\u003c\/td\u003e\n\u003ctd\u003e9217756 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBEL Made\u003c\/td\u003e\n\u003ctd\u003e4.5 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e9258281 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBEL Made\u003c\/td\u003e\n\u003ctd\u003e4 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e9258281–9477829\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAN Made\u003c\/td\u003e\n\u003ctd\u003e9.8 HP\u003c\/td\u003e\n\u003ctd\u003e7125388 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAN Made\u003c\/td\u003e\n\u003ctd\u003e7.5 HP\u003c\/td\u003e\n\u003ctd\u003e7125388 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAN Made\u003c\/td\u003e\n\u003ctd\u003e4.5 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e7147238 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCAN Made\u003c\/td\u003e\n\u003ctd\u003e4 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e7143688 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAUS Made\u003c\/td\u003e\n\u003ctd\u003e9.8 HP\u003c\/td\u003e\n\u003ctd\u003e8057545 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAUS Made\u003c\/td\u003e\n\u003ctd\u003e7.5 HP\u003c\/td\u003e\n\u003ctd\u003e8057545 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAUS Made\u003c\/td\u003e\n\u003ctd\u003e4.5 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e8068065 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAUS Made\u003c\/td\u003e\n\u003ctd\u003e4 HP, 1 cylinder\u003c\/td\u003e\n\u003ctd\u003e8068065 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n\u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater pump impeller kit\u003c\/dd\u003e\n\u003cdt\u003eInstallation Location\u003c\/dt\u003e\n\u003cdd\u003eLower unit and driveshaft water pump\u003c\/dd\u003e\n\u003cdt\u003eMaterials\u003c\/dt\u003e\n\u003cdd\u003eNeoprene impeller, SS316 wear plate, nylon PA66 tube\u003c\/dd\u003e\n\u003cdt\u003eImpeller Blades\u003c\/dt\u003e\n\u003cdd\u003e6\u003c\/dd\u003e\n\u003cdt\u003eImpeller Height\u003c\/dt\u003e\n\u003cdd\u003e14.4 mm (0.57 in)\u003c\/dd\u003e\n\u003cdt\u003eImpeller Inside Diameter\u003c\/dt\u003e\n\u003cdd\u003e11.1 mm (0.438 in)\u003c\/dd\u003e\n\u003cdt\u003eImpeller Outside Diameter\u003c\/dt\u003e\n\u003cdd\u003e31.8 mm (1.250 in)\u003c\/dd\u003e\n\u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eInternal shaft mounting\u003c\/dd\u003e\n\u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e23 g (0.811 oz)\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Impeller, replacement for 47-89980 and 89980B references\u003c\/li\u003e\n\u003cli\u003e1 × Wear plate, replacement for 46895 reference\u003c\/li\u003e\n\u003cli\u003e1 × Woodruff key\u003c\/li\u003e\n\u003cli\u003e1 × Water guide tube sleeve\u003c\/li\u003e\n\u003cli\u003e3 × O-rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm fitment first:\u003c\/strong\u003e Mercury used different driveshaft and impeller dimensions in some horsepower ranges. This kit is for the smaller 0.438 in impeller inside diameter. Do not install it if the original impeller has a larger opening.\u003c\/li\u003e\n\u003cli\u003eDisconnect the spark plug leads to prevent accidental starting and place the outboard in neutral.\u003c\/li\u003e\n\u003cli\u003eRemove the bolts securing the lower unit to the upper leg. Lower the unit carefully while observing the shift-shaft linkage.\u003c\/li\u003e\n\u003cli\u003ePlace the lower unit on a stable workbench and remove the water pump housing.\u003c\/li\u003e\n\u003cli\u003eRemove the old impeller, wear plate, gaskets, and seals. Note the orientation of each part.\u003c\/li\u003e\n\u003cli\u003eClean the mating surfaces and remove old gasket material, debris, and corrosion.\u003c\/li\u003e\n\u003cli\u003eInstall the replacement wear plate, gaskets, and O-rings included in the kit.\u003c\/li\u003e\n\u003cli\u003eInstall the new impeller on the driveshaft with the Woodruff key correctly seated. A small amount of dish soap may be used to lubricate the housing interior.\u003c\/li\u003e\n\u003cli\u003eRotate the driveshaft clockwise while lowering the pump housing over the impeller so the blades set correctly.\u003c\/li\u003e\n\u003cli\u003eSecure the housing and tighten its fasteners to the engine manufacturer's recommended torque.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit, aligning the water tube, driveshaft splines, and shift shaft.\u003c\/li\u003e\n\u003cli\u003eTest the engine with an appropriate water supply, such as flushing muffs or a test tank, and check for a strong tell-tale stream.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this impeller is the right size?\u003c\/summary\u003e\u003cp\u003eThe impeller inside diameter must match the driveshaft. This kit uses a 0.438 in (11.1 mm) inside diameter. Some Mercury and Mariner models in this horsepower range use a larger 0.456 in impeller. Measure the old impeller or driveshaft and verify the model and serial number before ordering.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eTypical signs include a weak or absent tell-tale stream, an overheating warning, elevated operating temperature, or reduced cooling performance. A rubber impeller may become brittle, cracked, distorted, or worn with use.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should I replace the impeller?\u003c\/summary\u003e\u003cp\u003eInspect the impeller regularly and consider replacement every 1–2 years or every 100–200 operating hours, depending on use and conditions such as saltwater, sand, silt, and debris.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I reuse the old wear plate or gaskets?\u003c\/summary\u003e\u003cp\u003eReplacing the components supplied with the kit is recommended. A worn or grooved wear plate, damaged gasket, or hardened O-ring can reduce pump efficiency and compromise sealing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhy are there different serial number ranges?\u003c\/summary\u003e\u003cp\u003eManufacturers may change components during a production run. The serial number can identify differences such as driveshaft or water-pump configuration, so fitment should be checked by model, year, origin, and serial number together.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this part OEM or aftermarket?\u003c\/summary\u003e\u003cp\u003eThis is an aftermarket replacement part, not an OEM component. It is intended to replace the listed OEM and aftermarket references when the engine model, serial number, and dimensions match.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the shipping speed and cost?\u003c\/summary\u003e\u003cp\u003eStandard delivery is typically estimated at 5–15 days and may be free to most locations. Available expedited delivery methods and costs are shown at checkout when offered for your destination.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\u003cp\u003eThe product is covered by a 1-year warranty against manufacturing defects under normal marine use. Returns are accepted within the applicable standard return window for unused items in original packaging. Contact support with your order information for assistance.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify the model, year, serial number, production origin, part dimensions, and original impeller before purchase. Pay particular attention to the \u003cstrong\u003e0.438 in (11.1 mm) impeller inside diameter\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement part and is not manufactured by or affiliated with Mercury, Mariner, Sierra, GLM, or CEF.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended when you are not familiar with lower-unit service. Incorrect installation can cause overheating or engine damage.\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 replacement parts designed for demanding saltwater and freshwater operating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Standard delivery is available 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 — We work directly with manufacturers to offer competitive pricing while maintaining material and quality-control standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723963633979,"sku":"BN-CX14-GD0F","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/BN-CX14-GD0F.png?v=1763038505"}],"url":"https:\/\/seasierra.com\/collections\/mercury-mariner-2-stroke-4hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}