{"title":"Tohatsu 2-6 HP 4-Stroke Outboard Parts","description":"\u003csection id=\"hero\" style=\"padding:16px 0;\"\u003e\n  \u003cp style=\"max-width:900px;margin:0 auto 12px;\"\u003e\n    This page supports Tohatsu 4‑Stroke 2–6 HP outboard engines and helps you quickly find compatible parts and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Tohatsu collection any time, and at the bottom of this page you’ll find a direct link to 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.\n  \u003c\/p\u003e\n  \u003cdiv style=\"text-align:center;\"\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #0a4;padding:10px 16px;border-radius:6px;text-decoration:none;\"\u003eBrowse All Tohatsu Parts\u003c\/a\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eHow to Identify Your 2–6 HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate\/serial plate: Look on the clamp bracket and on the cylinder block casting for the model\/serial. Photograph this plate before ordering parts.\u003c\/li\u003e\n    \u003cli\u003eModel code and suffix: Examples for this class include MFS4C, MFS5C, MFS6C with shaft suffixes S\/L\/UL (short\/long\/ultra‑long). “SP” indicates a charging\/alternator variant on some models. Controls may be tiller by default with optional remote on select versions.\u003c\/li\u003e\n    \u003cli\u003e4‑Stroke identifiers: You’ll see an engine oil fill cap\/dipstick and no separate 2‑stroke oil tank. Fuel may be from an integral tank or a separate 12 L portable tank depending on model.\u003c\/li\u003e\n    \u003cli\u003eProp\/rigging details: Shaft length and prop pitch affect parts selection (e.g., propellers, driveshaft components). Verify these from your nameplate and current rigging.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003eTohatsu 4\/5\/6 HP “C” Series (example: MFS4C\/MFS5C\/MFS6C)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSingle‑cylinder, water‑cooled, carbureted 4‑stroke, manual start. Through‑hub exhaust. Designed for portable use and small craft.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eMFS4C, MFS5C, MFS6C (S\/L\/UL). “SP” variants include a charging coil on select models. Optional remote control available on certain versions.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLightweight, quiet operation, low fuel consumption, simple routine service, and strong low‑speed torque for tenders and small inflatables.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eTypical service items include spark plugs (e.g., NGK DCPR6E with 0.8–0.9 mm gap), engine oil changes, lower‑unit gear oil, and water pump impeller. Oil and gear oil quantities are small on this platform; always confirm capacities and procedures in your official service manual.\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 0;\"\u003e\n  \u003ch2\u003eRoutine Maintenance \u0026amp; Service Parts\u003c\/h2\u003e\n  \u003cp\u003eIntervals below are general guidelines for small Tohatsu 4‑stroke portables. Always follow the procedures, specifications, and safety instructions in your official service manual.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEngine oil (FC‑W 10W‑30\/10W‑40)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eFirst 20 hrs, then every 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWarm engine, drain fully, refill to dipstick mark. Do not overfill. Typical capacity is small on 4\/5\/6 HP; confirm in your manual.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\"\u003eTohatsu Outboard Parts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLower‑unit gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEvery 100 hrs or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eDrain from bottom, fill from below until it exits top plug. Inspect for water (milky oil). Replace seals if intrusion is found.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-lower-unit-seal-kits\"\u003eTohatsu Lower Unit Seal Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSpark plug(s)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect every 100 hrs; replace 200 hrs or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eUse the specified heat range (e.g., NGK DCPR6E on many 4\/5\/6C). Gap typically 0.8–0.9 mm; confirm for your model.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;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:8px;border-bottom:1px solid #eee;\"\u003eFuel filter(s)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect every 50–100 hrs; replace as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck in‑engine screen and portable tank pickup. Consider a water‑separating filter when using a separate 12 L tank.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;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:8px;border-bottom:1px solid #eee;\"\u003eWater pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eEvery 1–2 seasons (or 200 hrs)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eReplace sooner for sandy\/silty use or weak tell‑tale stream. Always verify correct kit for your model and shaft length.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-water-pump-repair-kits\"\u003eTohatsu Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eAnodes (sacrificial)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect every 50 hrs; replace when ~30% eroded\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eNever paint or grease anodes. Check more often in brackish\/salt water.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;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:8px;border-bottom:1px solid #eee;\"\u003ePropeller (inspection\/selection)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck frequently\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect for damage and correct pitch. Small Tohatsu 4\/5\/6 HP often run 6–9\" pitches; verify for your hull and load.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003cp style=\"font-size:12px;color:#555;\"\u003e*Intervals are typical for small portable 4‑stroke outboards; always defer to your engine’s official service schedule.\u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service Kits and essentials: \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling system (impellers, pump kits): \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-water-pump-repair-kits\"\u003eTohatsu Water Pump Repair Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase seals and rebuild items: \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-lower-unit-seal-kits\"\u003eTohatsu Lower Unit Seal Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers and hardware: \u003ca href=\"https:\/\/seasierra.com\/collections\/propellers\"\u003ePropellers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \u0026amp; Electrical (plugs, small electrical): \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e · \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\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    \u003cli\u003eConvenience add‑ons: \u003ca href=\"https:\/\/seasierra.com\/collections\/boat-accessories\"\u003eBoat Accessories\u003c\/a\u003e · \u003ca href=\"https:\/\/seasierra.com\/collections\/propeller-guards\"\u003ePropeller Guards\u003c\/a\u003e · \u003ca href=\"https:\/\/seasierra.com\/collections\/outboard-hydrofoil-stabilizers\"\u003eOutboard Hydrofoil Stabilizers\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"padding:16px 0;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:960px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ccc;padding:8px;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWeak tell‑tale stream or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eInspect intake screens for blockage; verify impeller condition; confirm thermostat function; ensure tell‑tale is not obstructed.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eWater pump kit\/impeller, intake screen, thermostat, gaskets\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eHard starting or rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eConfirm fresh fuel; check\/replace spark plug and gap; prime bulb until firm; verify choke\/fast idle use on cold starts; inspect in‑line\/tank filters.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eSpark plug, fuel filter, primer bulb\/connector, carburetor service parts\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePoor acceleration or power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eCheck prop for bent blades; drain contaminated fuel; inspect fuel filter and venting; verify throttle linkage; confirm correct prop pitch and load.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003ePropeller, fuel filter, fuel tank cap\/vent components, spark plug\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eGearcase noise or milky gear oil\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eChange gear oil and inspect for water; check prop shaft seal for fishing line damage; evaluate drain\/fill plug gaskets.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;border-bottom:1px solid #eee;\"\u003eLower‑unit seal kit, plug gaskets, bearings (as required)\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 0;\"\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 items are shared within the MFS4C\/5C\/6C family, but changes by year, shaft length, and charging\/remote options can affect fitment. Provide your full model code, serial number, and shaft length to confirm compatibility.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should the impeller be replaced?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule, inspect annually and replace every 1–2 seasons (or ~200 hours). Replace sooner if you see a weak tell‑tale stream, overheating, or if the engine was run dry or in sandy water.\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\u003eAt least once per season or every 100 hours. If you find milky oil or metal debris, service seals and inspect internal components before further use.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information do you need to verify parts?\u003c\/summary\u003e\n    \u003cp\u003eSend the model code (e.g., MFS6C), serial number, shaft length (S\/L\/UL), control type (tiller or remote), and a photo of the nameplate and the part you’re replacing. This ensures the most accurate match.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"padding:16px 0;\"\u003e\n  \u003cp style=\"max-width:900px;margin:0 auto 12px;\"\u003eReady to find parts? Browse the main Tohatsu collection and use the Filter \u0026amp; Sort tools to narrow by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003cdiv style=\"text-align:center;margin-bottom:8px;\"\u003e\n    \u003ca href=\"https:\/\/seasierra.com\/collections\/tohatsu-outboard-parts\" style=\"display:inline-block;padding:10px 16px;border:1px solid #0a4;border-radius:6px;text-decoration:none;\"\u003eShop Tohatsu Outboard Parts\u003c\/a\u003e\n  \u003c\/div\u003e\n  \u003cp style=\"font-size:12px;color:#555;text-align:center;max-width:900px;margin:0 auto;\"\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":"water-pump-impeller-fits-mercury-tohatsu-evinrude-2-5-6-hp-4-stroke-2-5-hp-2-stroke-replaces-47-161543-369-65021-1-5040180","title":"Aftermarket Water Pump Impeller for Nissan\/Tohatsu 2–6 HP Outboards and Mercury 2–3.5 HP 4-Stroke Models","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 {\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\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003ewater pump impeller\u003c\/strong\u003e is designed for selected small Nissan\/Tohatsu and Mercury\/Mariner outboard applications. It supports Nissan 3.5B\/NS5B engines, Tohatsu 2-stroke 2 HP, 2.5 HP, 2.5A, 3.5A, 3.5B, 3.5 HP, 4 HP, and 5 HP models, as well as Tohatsu 4-stroke MFS4, MFS5, and MFS6 HP models. The company fitment information also identifies Mercury\/Mariner 4-stroke 2 HP, 2.5 HP, and 3.5 HP carbureted applications.\u003c\/p\u003e\n\u003cp\u003eThe impeller is a direct replacement component for water pump service when its dimensions and original part reference match your engine. Catalog records also associate the primary Tohatsu reference with selected M2\/M2.5\/M3.5, M4\/M5, MFS2\/MFS2.5\/MFS3.5, and MFS4\/MFS5\/MFS6 engine applications. Always confirm the exact model and service information before installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSingle aftermarket water pump impeller.\u003c\/li\u003e\n  \u003cli\u003eSix-blade design for the listed outboard applications.\u003c\/li\u003e\n  \u003cli\u003eInside diameter: 10.25 mm.\u003c\/li\u003e\n  \u003cli\u003eOutside diameter: 33.6 mm.\u003c\/li\u003e\n  \u003cli\u003eWidth: 14.2 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eThe following OEM and aftermarket references are associated with this impeller. A reference number alone does not replace confirmation of the complete engine model and application.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Interchange\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n\u003cth\u003eBrand or Supplier\u003c\/th\u003e\n\u003cth\u003eReference 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\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e369650211M\u003c\/td\u003e\n\u003ctd\u003eOEM reference format\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury Marine\u003c\/td\u003e\n\u003ctd\u003e47-16154-3\u003c\/td\u003e\n\u003ctd\u003eOEM reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury Marine\u003c\/td\u003e\n\u003ctd\u003e47-161543\u003c\/td\u003e\n\u003ctd\u003eOEM reference format\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury Marine\u003c\/td\u003e\n\u003ctd\u003e8M0204676\u003c\/td\u003e\n\u003ctd\u003eReference number\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEvinrude \/ Johnson \/ OMC \/ BRP\u003c\/td\u003e\n\u003ctd\u003e5040180\u003c\/td\u003e\n\u003ctd\u003eReference number\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3098\u003c\/td\u003e\n\u003ctd\u003eAftermarket reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-45302\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\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eFitment is application-specific. Keep the horsepower, stroke, model family, and any carburetor or serial-number conditions together when checking your engine. The table below summarizes the applications explicitly identified for this product and related catalog records.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel or Application\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eApplication Notes\u003c\/th\u003e\n        \u003cth\u003eReference\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eNissan\u003c\/td\u003e\n\u003ctd\u003e3.5B \/ NS5B\u003c\/td\u003e\n\u003ctd\u003e3.5–5\u003c\/td\u003e\n\u003ctd\u003eNot stated in company record\u003c\/td\u003e\n\u003ctd\u003eConfirm exact model designation\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e2 HP\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eCompany-listed application\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e2.5 HP; 2.5A; 3.5A; 3.5B\u003c\/td\u003e\n\u003ctd\u003e2.5–3.5\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eCompany-listed application\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\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\u003eCompany-listed application\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003e4 HP \/ 5 HP\u003c\/td\u003e\n\u003ctd\u003e4–5\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003eCompany-listed application\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTohatsu\u003c\/td\u003e\n\u003ctd\u003eMFS4 \/ MFS5 \/ MFS6\u003c\/td\u003e\n\u003ctd\u003e4–6\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eCompany-listed application\u003c\/td\u003e\n\u003ctd\u003e369-65021-1\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMercury \/ Mariner\u003c\/td\u003e\n\u003ctd\u003e4-stroke 2 HP, 2.5 HP, and 3.5 HP carbureted models\u003c\/td\u003e\n\u003ctd\u003e2–3.5\u003c\/td\u003e\n\u003ctd\u003e4-Stroke\u003c\/td\u003e\n\u003ctd\u003eConfirm carburetor version and exact model\u003c\/td\u003e\n\u003ctd\u003e47-16154-3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eWater Pump Impeller\u003c\/dd\u003e\n  \u003cdt\u003eProduct Construction\u003c\/dt\u003e\n  \u003cdd\u003eRubber impeller\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eReplacement water pump component\u003c\/dd\u003e\n  \u003cdt\u003eInside Diameter\u003c\/dt\u003e\n  \u003cdd\u003e10.25 mm\u003c\/dd\u003e\n  \u003cdt\u003eOutside Diameter\u003c\/dt\u003e\n  \u003cdd\u003e33.6 mm\u003c\/dd\u003e\n  \u003cdt\u003eWidth\u003c\/dt\u003e\n  \u003cdd\u003e14.2 mm\u003c\/dd\u003e\n  \u003cdt\u003eBlade Configuration\u003c\/dt\u003e\n  \u003cdd\u003e6 blades\u003c\/dd\u003e\n  \u003cdt\u003eQuantity\u003c\/dt\u003e\n  \u003cdd\u003e1 impeller\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x aftermarket water pump impeller\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eConfirm the engine model, stroke, application details, and original impeller reference before starting work.\u003c\/li\u003e\n  \u003cli\u003eFollow the outboard manufacturer's service procedure for removing the lower unit and water pump housing.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller and inspect the housing, wear plate, key, water tube, and related pump components for damage or corrosion.\u003c\/li\u003e\n  \u003cli\u003eClean debris and corrosion from the pump area before installing the replacement impeller.\u003c\/li\u003e\n  \u003cli\u003eInstall the impeller in the same orientation specified by the service manual. Use only an installation lubricant approved for the application.\u003c\/li\u003e\n  \u003cli\u003eReassemble the water pump and lower unit using the manufacturer's tightening sequence and torque specifications.\u003c\/li\u003e\n  \u003cli\u003eRun the engine only in an appropriate water supply or service tank and verify a strong cooling-water discharge before normal operation.\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 impeller fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eCompare your original impeller's reference number and dimensions, then check the complete engine model, horsepower, stroke, and application details against the compatibility information above. For Mercury\/Mariner models, confirm the 4-stroke 2 HP, 2.5 HP, or 3.5 HP carbureted application. If the model or part details differ, consult the engine service manual before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are common signs of a worn water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eA weak or missing tell-tale stream, overheating, or visible cracked, brittle, distorted, or missing blades can indicate that the impeller or another cooling-system component requires service.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\n  \u003cp\u003eThis is an aftermarket replacement impeller. The OEM and aftermarket numbers shown above are reference numbers used to help identify applications; the product is not represented as a genuine OEM component.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes the package include a key, gasket, or water pump housing?\u003c\/summary\u003e\n  \u003cp\u003eNo. The package contains one water pump impeller only. A key, gasket, housing, wear plate, or complete water pump kit is not included unless separately stated in the order details.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should the impeller be replaced?\u003c\/summary\u003e\n  \u003cp\u003eReplacement timing depends on the engine manufacturer's maintenance schedule and operating conditions. Inspect the impeller during scheduled water pump service and replace it if the blades show wear, cracking, distortion, or damage.\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, dimensions, engine model, horsepower, and stroke before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not rely on horsepower alone to determine fitment; model family and application details can change the required impeller.\u003c\/li\u003e\n  \u003cli\u003eUse the manufacturer's service manual for lower-unit removal, installation orientation, torque specifications, and testing procedures.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component and is not a genuine OEM part.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation by a qualified marine technician is recommended when the required service procedure is unfamiliar.\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 provide aftermarket components for routine outboard maintenance and repair.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Information\u003c\/strong\u003e — Product references and fitment details are presented to help customers compare their original part and engine specifications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePractical Service Support\u003c\/strong\u003e — Follow the engine manufacturer's service instructions for safe installation and reliable operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723801530683,"sku":"17IT001","price":14.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/17IT0011_0dc8836f-1498-48cd-bd0b-0cdc8bf62f2c.jpg?v=1763032196"}],"url":"https:\/\/seasierra.com\/collections\/tohatsu-2-6-hp-4-stroke-outboard-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}