{"title":"Johnson 2-Stroke 3-7.5HP Outboard Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px;border:1px solid #e3e3e3;border-radius:8px;\"\u003e\n  \u003cp\u003eThis page is focused on Johnson 2-Stroke 3–7.5HP outboard engines. Use it to find compatible parts and key service information, including maintenance tips, common replacement items, and troubleshooting guidance. You can also browse the main Johnson\/Evinrude collection. Scroll to the bottom to start browsing parts for this engine, and on the collection page use the Filter \u0026amp; Sort controls to narrow results by horsepower, year range, and part category.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\" style=\"display:inline-block;padding:10px 14px;background:#0b6efd;color:#fff;text-decoration:none;border-radius:6px;\"\u003eBrowse All Johnson\/Evinrude Parts\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 3–7.5HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eNameplate\/serial plate is typically on the transom bracket or swivel bracket. Record the model and serial numbers exactly.\u003c\/li\u003e\n    \u003cli\u003eModel codes and suffixes often indicate horsepower, shaft length (e.g., short\/long), and production year. The suffix may also denote tiller vs. remote features.\u003c\/li\u003e\n    \u003cli\u003eThese small 2-strokes are carbureted and usually rope-start. Most 3–4HP are single-cylinder; many 5–7.5HP units are twin-cylinder—count spark plugs to confirm.\u003c\/li\u003e\n    \u003cli\u003e2-stroke models use premixed fuel (commonly 50:1 with TC-W3 oil). Verify the correct ratio in your service manual or under the cowl decal.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"platforms\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003ePlatform Overview\u003c\/h2\u003e\n  \u003ch3\u003eSmall Single-Cylinder (Approx. 3–4HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCarbureted 2-stroke, single-cylinder, tiller steer, rope start.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e3HP–4HP portable 2-stroke models (short or long shaft).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUltra-lightweight, simple service, excellent portability for dinghies\/tenders.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSmall gearcase and water pump; propellers often use a shear pin. Parts differ from twin-cylinder units—verify by model number.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eTwin-Cylinder (Approx. 5–7.5HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%;max-width:900px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eDescription\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCarbureted 2-stroke, two-cylinder, tiller steer, rope start (some electric-start variants exist).\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e5HP–7.5HP classic 2-stroke models with short\/long shaft options.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSmoother running than singles, good low- to mid-range torque for small fishing boats and inflatables.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump, propeller hub, and lower unit seal kits are specific to this gearcase size—confirm by model\/serial 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=\"margin-top:24px;\"\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 your official service manual for your exact model and duty cycle.\u003c\/p\u003e\n  \u003ctable style=\"width:100%;max-width:1000px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eParts Link\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eGear oil (lower unit)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCheck for water contamination (milky oil). Replace seals if water is present.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\"\u003eJohnson\/Evinrude Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect every 50 hours; replace ~100 hours\/season\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUse the correct heat range and gap; carry spares for single- and twin-cylinder models.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\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 0;\"\u003eFuel filter \/ inline filter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect 50 hours; replace annually\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eReplace sooner if debris or phase-separated fuel is suspected.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\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 0;\"\u003eFuel pump diaphragm\/service\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEvery 3 years or if hard starting\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eStiff diaphragms cause lean conditions and surging; replace as needed.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\"\u003eFuel Pumps\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump impeller \/ kit\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e200 hours or every 2 seasons\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEssential for cooling; replace more often in sandy\/silty water.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-water-pump-repair-kits\"\u003eJohnson\/Evinrude Water Pump Repair Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAnodes (gearcase\/trim tab)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect quarterly; replace at \u0026lt;50%\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSelect zinc (salt), aluminum (brackish\/salt), or magnesium (fresh) as appropriate.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eJohnson\/Evinrude Anodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePropeller \u0026amp; shear pin\/cotter\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect each outing\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCarry spare shear pins; remove line\/weed and check thrust washer.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-propellers\"\u003eJohnson\/Evinrude Propellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePremix fuel\/oil (2-stroke)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eEvery refuel\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCommonly 50:1 with TC-W3 oil unless otherwise specified by your model.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\"\u003eJohnson\/Evinrude Collection\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eLower unit seal kit (if leak found)\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eAs needed\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUse pressure\/vacuum test; replace seals if oil is milky or leaking.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\"\u003eJohnson\/Evinrude Lower Unit Seal 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=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service: \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-service-maintenance-kits\"\u003eJohnson\/Evinrude Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System: \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-water-pump-repair-kits\"\u003eWater Pump Repair Kits\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 and \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\"\u003eFuel Pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \/ Electrical: \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark Plugs\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/electrical-items\"\u003eElectrical Items\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGearcase \u0026amp; Seals: \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude-omc-lower-unit-seal-kits\"\u003eLower Unit Seal Kits\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-bearing\"\u003eBearings\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003ePropellers \u0026amp; Hardware: \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-propellers\"\u003ePropellers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/washers\"\u003eWashers\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCorrosion Protection: \u003ca href=\"https:\/\/seasierra.com\/collections\/bombardier-anodes\"\u003eAnodes\u003c\/a\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"troubleshooting\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eCommon Symptoms \u0026amp; Quick Checks\u003c\/h2\u003e\n  \u003ctable style=\"width:100%;max-width:1000px;border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left;border-bottom:1px solid #ddd;\"\u003eRelated Parts\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWeak tell‑tale or overheat alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eInspect intake screen for blockage; verify tell‑tale hose is clear; confirm impeller age.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eWater pump kit, thermostat, intake screen\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePoor acceleration or cavitation\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eCheck prop for damage and fishing line; verify shear pin; ensure correct prop pitch.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003ePropeller, shear pin, thrust washer\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eUse fresh fuel; prime system; verify choke\/enrichment; inspect spark plugs and plug wires.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSpark plugs, carburetor kit, fuel filter, fuel pump\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eExcessive smoke or plug fouling\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eConfirm oil ratio; check for stuck choke and leaking needle\/seat; avoid extended no‑load idling.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eSpark plugs, carburetor needles\/seats, fuel hose\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eGearcase noise or milky oil\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eVerify oil level and condition; pressure\/vac test the gearcase; inspect propshaft seal for fishing line.\u003c\/td\u003e\n        \u003ctd style=\"padding:6px 0;\"\u003eLower unit seal kit, bearings, propshaft seals\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=\"margin-top:24px;\"\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\u003eSome items (spark plugs, anodes, universal fuel filters) cross many years, but water pump kits, lower unit seal kits, and propellers are gearcase- and model-specific. Always confirm using your exact model and serial.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the impeller on a small Johnson 2-stroke?\u003c\/summary\u003e\n    \u003cp\u003eAs a rule of thumb, every 200 hours or every two seasons. Replace sooner if the tell‑tale weakens, you strike bottom, or the engine runs in sandy\/silty water frequently.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change lower unit gear oil?\u003c\/summary\u003e\n    \u003cp\u003eAt least annually or every 100 hours. Inspect the drained oil—milky fluid indicates water intrusion and the need for seal inspection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat info do you need to confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the model and serial numbers from the bracket plate, plus shaft length, starting type (rope\/electric), and any known year range. Photos of the gearcase and water pump parts also help.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"cta\" style=\"margin-top:24px;padding:16px;border:1px solid #e3e3e3;border-radius:8px;\"\u003e\n  \u003cp\u003eReady to find parts by horsepower, year, and model? Browse our main Johnson\/Evinrude collection to locate components that fit your 3–7.5HP 2-stroke.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/johnson-evinrude\" style=\"display:inline-block;margin-top:8px;padding:10px 14px;background:#0b6efd;color:#fff;text-decoration:none;border-radius:6px;\"\u003eShop Johnson\/Evinrude Parts\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px;color:#555;\"\u003eIf you’re unsure about your model, send us a clear photo of the nameplate and the part you need—we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"water-pump-impeller-fits-johnson-evinrude-3-7-5-hp-2-stroke-replaces-277181-434424","title":"Water Pump Impeller for Johnson\/Evinrude 3–7.5 HP 2-Stroke Outboards – Replaces 277181 and 434424","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eWater Pump Impeller\u003c\/strong\u003e is intended for selected Johnson\/Evinrude 2-stroke outboard engines from 3 HP through 7.5 HP. The listed applications include Johnson\/Evinrude 3 HP models from 1952–1978, 4 HP models from 1969–1983, 5 HP models from 1965–1968, 5.5 HP models from 1954–1964, 6 HP models from 1972–1978, and 7.5 HP models from 1954–1958.\u003c\/p\u003e\n\u003cp\u003eFor 4 HP engines from 1973–1983, the listed application is for water pumps using one water tube and a 110 gearcase. Confirm the exact engine model, year, gearcase configuration, and existing impeller dimensions before ordering.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAftermarket replacement water pump impeller for marine cooling systems.\u003c\/li\u003e\n\u003cli\u003eMade from neoprene rubber for use in an outboard water pump.\u003c\/li\u003e\n\u003cli\u003eSingle impeller supplied; installation should follow the applicable engine service manual.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse these manufacturer and aftermarket references to compare your existing part with this replacement impeller.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra Marine\u003c\/td\u003e\n        \u003ctd\u003e18-3001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMallory Marine\u003c\/td\u003e\n        \u003ctd\u003e9-45216\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e89580\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSEI Marine\u003c\/td\u003e\n        \u003ctd\u003e96-399-01ECEF \/ 500350\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 0277181 \/ 434424 \/ 0434424 \/ 777819 \/ 0777819\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\u003eThe applications below are grouped by horsepower, stroke, and year. Model names can vary by market and serial-number range, so compare all listed conditions with your engine and existing part.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine and Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eReference Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e3\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1952–1978\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1969–1972\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e4\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1973–1983\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eFor water pumps using one water tube and a 110 gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1965–1968\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e5.5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1954–1964\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e6\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1972–1978\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and gearcase.\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n        \u003ctd\u003eVarious\u003c\/td\u003e\n        \u003ctd\u003e7.5\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1954–1958\u003c\/td\u003e\n        \u003ctd\u003e277181 \/ 434424\u003c\/td\u003e\n        \u003ctd\u003eConfirm the exact model and gearcase.\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\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eSelected Johnson\/Evinrude 2-stroke outboards, 3–7.5 HP\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eNeoprene rubber\u003c\/dd\u003e\n  \u003cdt\u003eOutside Diameter\u003c\/dt\u003e\n  \u003cdd\u003eApproximately 2.50 in\u003c\/dd\u003e\n  \u003cdt\u003eInside Diameter\u003c\/dt\u003e\n  \u003cdd\u003eApproximately 0.425 in\u003c\/dd\u003e\n  \u003cdt\u003ePart Configuration\u003c\/dt\u003e\n  \u003cdd\u003eSingle 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 Water Pump Impeller\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe drive key, gaskets, housing, and other water-pump components are not listed as included. Reuse or replace these components only as specified by the applicable service manual.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eTurn off the engine and follow the safety and removal procedures in the applicable service manual.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit or gearcase as required to access the water pump.\u003c\/li\u003e\n  \u003cli\u003eRemove the water pump housing cover and note the installed direction of the old impeller blades.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller and inspect the drive key, housing, plate, seals, and mating surfaces for wear or damage.\u003c\/li\u003e\n  \u003cli\u003eClean the mating surfaces and install the replacement impeller using the correct drive key and any required gaskets or seals. The drive key is not included with this single impeller.\u003c\/li\u003e\n  \u003cli\u003eInstall the impeller in the correct rotational direction and refit the water pump housing.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, ensuring that the water tube and driveshaft are correctly aligned.\u003c\/li\u003e\n  \u003cli\u003eTest the cooling-water discharge according to the service manual before returning the engine to 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 know if this impeller fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eCompare the engine brand, horsepower, 2-stroke configuration, model year, gearcase arrangement, existing part number, and impeller dimensions with the information on this page. For 4 HP engines from 1973–1983, confirm that the water pump uses one water tube and a 110 gearcase. If any condition differs, consult the engine service manual before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat part numbers does this impeller replace?\u003c\/summary\u003e\n  \u003cp\u003eThe listed Johnson\/Evinrude reference numbers are 277181, 0277181, 434424, 0434424, 777819, and 0777819. Listed aftermarket references include Sierra Marine 18-3001, Mallory Marine 9-45216, GLM 89580, and SEI Marine 96-399-01ECEF \/ 500350.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs include a weak or missing telltale stream, overheating, an overheating alarm, or steam from the exhaust. Stop operation and investigate the cooling system if these symptoms occur.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes the impeller include a drive key or gasket?\u003c\/summary\u003e\n  \u003cp\u003eNo. This listing is for one impeller only. A drive key, gasket, seal, or other water-pump component is not listed as included and should be sourced or replaced according to the applicable service manual.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs this an OEM part or aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis is an aftermarket replacement impeller, not an OEM component. The manufacturer references shown above are provided for identification and cross-reference purposes.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the engine model, horsepower, year, stroke, gearcase configuration, reference number, and dimensions before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not operate an outboard with inadequate cooling-water flow.\u003c\/li\u003e\n  \u003cli\u003eUse the applicable engine service manual for installation procedures, torque specifications, and replacement intervals.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended if you are not familiar with lower-unit or water-pump service.\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 outboard and marine applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listings\u003c\/strong\u003e — Product references and fitment conditions are provided to help you compare the replacement with your original part.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCustomer Support\u003c\/strong\u003e — Contact support with your engine model, year, existing part number, and application details if you need help confirming compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723968385339,"sku":"17IO004","price":15.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Water_Pump_Impeller_for_Evinrude_Johnson_OMC_3_4_5_55_6_75HP_277181_434424_-_JLM_MARINE-8290179.jpg?v=1763038710"}],"url":"https:\/\/seasierra.com\/collections\/johnson-2-stroke-3-7-5hp-outboard-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}