{"title":"Indmar 4-Stroke 450HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e7eb; border-radius:8px;\"\u003e\n  \u003cp\u003e\n    This page is tailored for Indmar 4‑Stroke 450HP marine engines and helps you quickly find compatible parts and practical service information. Below you’ll find maintenance tips, frequently replaced components, and troubleshooting guidance. You can also browse our major engine parts collections if you need to compare options across categories. Scroll to the bottom of the page to start browsing parts for this engine. On any collection page, use the Filter \u0026amp; Sort controls to narrow by horsepower, year range, and part category.\n  \u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\" style=\"display:inline-block; padding:10px 14px; background:#0ea5e9; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse Engine Service Kits\u003c\/a\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"identify-model\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eHow to Identify Your 450HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eEngine nameplate\/serial: Look for the Indmar ID decal on the intake manifold cover, flame‑arrestor shroud, or valve cover area. Record the full model designation and serial.\u003c\/li\u003e\n    \u003cli\u003eECM\/controls label: Many 450HP packages use GM LS‑based or Ford Raptor‑based ECMs. The ECM sticker typically shows the calibration\/family that helps confirm parts.\u003c\/li\u003e\n    \u003cli\u003ePlatform cues: GM LS‑based 6.2L packages (LS3\/Monsoon) have coil‑near‑plug ignition on each valve cover; Ford Raptor‑based 6.2L uses a different front dress and sensor set. Both are 4‑stroke EFI V8s.\u003c\/li\u003e\n    \u003cli\u003eCooling system: Note if the engine is raw‑water cooled or has a closed\/fresh‑water cooling kit (heat exchanger). Impellers, thermostats, and anodes can differ.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"engine-overview\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eEngine Platform Overview\u003c\/h2\u003e\n\n  \u003ch3\u003eGM‑based 6.2L LS V8 (approx. 450 HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; 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 #f3f4f6;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e6.2L V8, EFI, coil‑near‑plug ignition, 4‑stroke\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eLS\/LS3‑based Indmar marine packages commonly seen in premium towboats\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eStrong high‑RPM power, smooth EFI response, widely supported ignition\/fuel components\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eMany service items (filters, belts, sensors) are LS‑family specific; confirm by serial and ECM calibration before ordering.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eFord‑based 6.2L Raptor V8 (approx. 440–460 HP)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; 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 #f3f4f6;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e6.2L V8, EFI, drive‑by‑wire throttle, 4‑stroke\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eRaptor‑based Indmar packages in modern towboats (various torque\/power calibrations)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eExcellent mid‑range torque for watersports, robust cooling\/charging systems\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eBelt routing, pulley sets, sensors, and filters differ from GM‑based engines; match by serial and year.\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 Indmar 4‑stroke V8 marine engines. Always follow your official Indmar service manual for your exact model\/year and operating conditions.\u003c\/p\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; 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 #f3f4f6;\"\u003eEngine oil \u0026amp; filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e50–100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eUse marine‑rated oil; replace the filter at every oil change.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\" style=\"text-decoration:none; color:#0369a1;\"\u003eOil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eTransmission\/V‑drive fluid\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eChange fluid and inspect cooler\/lines; use spec’d ATF\/gear oil per model.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\" style=\"text-decoration:none; color:#0369a1;\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eRaw‑water pump impeller\/kit\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eReplace proactively; more frequently in sandy\/silty water.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/impellers\" style=\"text-decoration:none; color:#0369a1;\"\u003eImpellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eFuel filter \/ water separator\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eReplace more often if fuel quality is uncertain; prime the system after service.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\" style=\"text-decoration:none; color:#0369a1;\"\u003eFuel Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eUse the correct heat range and gap for your specific ECM calibration.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\" style=\"text-decoration:none; color:#0369a1;\"\u003eSpark Plugs\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eAnodes (corrosion protection)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eInspect monthly; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eMatch material (zinc\/aluminum\/magnesium) to your water type.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/anodes\" style=\"text-decoration:none; color:#0369a1;\"\u003eAnodes\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eSerpentine\/V‑belts\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eInspect each service; replace 200–300 hours or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eCheck for glazing\/cracking; verify tensioner operation.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\" style=\"text-decoration:none; color:#0369a1;\"\u003eBelts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eThermostat \u0026amp; housing gasket\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e2–3 seasons or if overheat\/erratic temps\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eReplace thermostat and gasket together; verify temp rating per model.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/gaskets\" style=\"text-decoration:none; color:#0369a1;\"\u003eGaskets\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\/service-maintenance-kits\" style=\"text-decoration:none; color:#0369a1;\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System – \u003ca href=\"https:\/\/seasierra.com\/collections\/impellers\" style=\"text-decoration:none; color:#0369a1;\"\u003eImpellers\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\" style=\"text-decoration:none; color:#0369a1;\"\u003eWater pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\" style=\"text-decoration:none; color:#0369a1;\"\u003eFuel Filters\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\" style=\"text-decoration:none; color:#0369a1;\"\u003eFuel Pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition\/Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/alternators\" style=\"text-decoration:none; color:#0369a1;\"\u003eAlternators\u003c\/a\u003e, \u003ca href=\"https:\/\/seasierra.com\/collections\/starters\" style=\"text-decoration:none; color:#0369a1;\"\u003eStarters\u003c\/a\u003e, \u003ca href=\"https:\/\/seasierra.com\/collections\/sensors\" style=\"text-decoration:none; color:#0369a1;\"\u003eSensors\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eLubrication – \u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\" style=\"text-decoration:none; color:#0369a1;\"\u003eOil Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eAir \u0026amp; Intake – \u003ca href=\"https:\/\/seasierra.com\/collections\/air-filters\" style=\"text-decoration:none; color:#0369a1;\"\u003eAir Filters\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eGaskets \u0026amp; Plumbing – \u003ca href=\"https:\/\/seasierra.com\/collections\/gaskets\" style=\"text-decoration:none; color:#0369a1;\"\u003eGaskets\u003c\/a\u003e and \u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\" style=\"text-decoration:none; color:#0369a1;\"\u003eHoses\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%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #e5e7eb; 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 #f3f4f6;\"\u003eOverheat alarm \/ weak water flow\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eInspect sea strainer and intake; check raw‑water impeller and thermostat; verify belt drive.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eWater pump impeller\/kit, thermostat, belts, intake screen\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eConfirm clean fuel and proper pressure; replace fuel filter; inspect plugs and air filter.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eFuel filter, injectors, spark plugs, air filter\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eCheck battery voltage and starter draw; verify IAC\/MAF\/MAP sensor signals and vacuum leaks.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eStarter, sensors (IAC\/MAF\/MAP), fuel filter, ignition leads\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eCheck‑engine light \/ stored fault codes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eScan ECM; inspect connectors\/grounds; confirm sensor part family (GM LS vs Ford 6.2).\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f3f4f6;\"\u003eECM‑related sensors, harness connectors, grounds\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eTransmission whine \/ harsh shifts\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eVerify fluid level\/condition; inspect cooler and lines; check alignment and mounts.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eATF\/gear oil, hoses, cooler, mounts\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 GM LS‑based and Ford 6.2L Raptor platforms?\u003c\/summary\u003e\n    \u003cp\u003eMany wear items look similar but differ in fit and calibration between platforms. Always verify by engine serial number, ECM family, and year before ordering filters, sensors, belts, and ignition components.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhen should I replace the raw‑water impeller?\u003c\/summary\u003e\n    \u003cp\u003eProactively every 100 hours or once per season—sooner if operating in sandy or silty water, or if you notice reduced cooling flow, rising temperatures, or vane damage on inspection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should transmission or V‑drive fluid be changed?\u003c\/summary\u003e\n    \u003cp\u003eAs a general rule, service annually or every 100 hours. Use the fluid type and quantity specified for your transmission model, and inspect the cooler\/hoses at the same time.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide the Indmar model and serial number, boat make\/model\/year, ECM family (GM LS or Ford 6.2), cooling type (raw vs closed), and photos of the existing part and mounting area.\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 #e5e7eb; border-radius:8px;\"\u003e\n  \u003cp\u003eReady to service your Indmar 4‑Stroke 450HP engine? Browse our engine parts collections by category to match the right components for your horsepower, year, and model.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\" style=\"display:inline-block; margin-top:8px; padding:10px 14px; background:#0ea5e9; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#374151;\"\u003eIf you’re unsure about your model, send us a clear photo of the engine nameplate and the part you need—we’ll help verify compatibility.\u003c\/p\u003e\n\u003c\/section\u003e","products":[{"product_id":"impeller-repair-kit-fits-johnson-jabsco-indmar-yanmar-replaces-09-812b-1-17935-0001-p","title":"Impeller Repair Kit for Johnson Pump Applications – Replaces 09-812B-1","description":"\u003csection\u003e\n\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\u003eimpeller repair kit\u003c\/strong\u003e is intended for selected raw-water pump applications using the Johnson Pump reference \u003cstrong\u003e09-812B-1\u003c\/strong\u003e. It is supplied as a service kit for replacing a worn or damaged marine engine cooling-system impeller.\u003c\/p\u003e\n\u003cp\u003eFitment depends on the exact pump, housing, shaft configuration, and engine application. Confirm the part number and the physical design of your existing impeller before ordering. The reference number is associated with Johnson Pump applications in the available catalog material; it should not be treated as universal fitment for every Johnson, Jabsco, Indmar, Yanmar, Volvo, or boat model.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAftermarket replacement for selected raw-water pump impeller applications.\u003c\/li\u003e\n  \u003cli\u003eDesigned for routine cooling-system service when the pump and impeller specifications match.\u003c\/li\u003e\n  \u003cli\u003eKit format includes the impeller and the listed sealing components.\u003c\/li\u003e\n  \u003cli\u003eVerify dimensions, spline or shaft connection, blade count, and cover-plate seal before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number References\u003c\/h2\u003e\n\u003cp\u003eThe following numbers are reference leads supplied with this listing. Cross-reference them against the number stamped or listed for your pump; number co-occurrence alone does not confirm fitment.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number References\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n\u003cth\u003eBrand or Source\u003c\/th\u003e\n\u003cth\u003eReference Number\u003c\/th\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson Pump\u003c\/td\u003e\n\u003ctd\u003e09-812B-1\u003c\/td\u003e\n\u003ctd\u003ePrimary replacement reference\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson Pump\u003c\/td\u003e\n\u003ctd\u003e09-812B\u003c\/td\u003e\n\u003ctd\u003eRelated reference shown for identification\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJabsco\u003c\/td\u003e\n\u003ctd\u003e17935-0001-P\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify before purchase\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3306\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify before purchase\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eIndmar\u003c\/td\u003e\n\u003ctd\u003eS685007 \/ 685007\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify pump configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYanmar\u003c\/td\u003e\n\u003ctd\u003e119773-42600 \/ 119773-42600-01\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify application\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003ePleasurecraft\u003c\/td\u003e\n\u003ctd\u003eRP061018\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify application\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-45704\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify application\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e6TA-12457-00\u003c\/td\u003e\n\u003ctd\u003eListing cross-reference; verify application\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eApplication and Compatibility\u003c\/h2\u003e\n\u003cp\u003eThis kit is for selected marine raw-water pump applications rather than all engines sold under the brands listed below. The available catalog evidence identifies Johnson Pump 09-812B-1 in connection with a Volvo cooling-system application, including Volvo applications described as 1998 and earlier. This information is a catalog lead and must be checked against the complete pump and engine identification.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Application and Compatibility Guidance\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eReference\u003c\/th\u003e\n\u003cth\u003eCompatibility Guidance\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson Pump\u003c\/td\u003e\n\u003ctd\u003e09-812B-1 \/ 09-812B\u003c\/td\u003e\n\u003ctd\u003eConfirm the pump model, housing, shaft, and impeller dimensions.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eVolvo cooling-system applications\u003c\/td\u003e\n\u003ctd\u003eCatalog association with Johnson Pump 09-812B-1\u003c\/td\u003e\n\u003ctd\u003eCatalog text identifies Volvo applications described as 1998 and earlier; verify the exact engine and pump assembly.\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJabsco, Indmar, Yanmar, Pleasurecraft, Mallory, and Yamaha applications\u003c\/td\u003e\n\u003ctd\u003eSee reference table\u003c\/td\u003e\n\u003ctd\u003eUse the listed numbers only as cross-reference leads. Do not rely on brand or boat model alone.\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n  \u003cdd\u003eRaw-water pump impeller repair kit\u003c\/dd\u003e\n  \u003cdt\u003eProduct Construction\u003c\/dt\u003e\n  \u003cdd\u003eNeoprene impeller with metal insert, as described for this listing\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n  \u003cdd\u003eReplacement service part for a matching pump assembly\u003c\/dd\u003e\n  \u003cdt\u003eFitment Basis\u003c\/dt\u003e\n  \u003cdd\u003ePart-number and physical-dimension comparison required\u003c\/dd\u003e\n  \u003cdt\u003ePrimary Reference\u003c\/dt\u003e\n  \u003cdd\u003eJohnson Pump 09-812B-1\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cp\u003eExact dimensions, blade count, spline configuration, shaft size, and seal profile should be compared with the original part and pump manufacturer information before installation. Do not assume that a similar-looking impeller is interchangeable.\u003c\/p\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x Replacement impeller\u003c\/li\u003e\n  \u003cli\u003e1 x O-ring\u003c\/li\u003e\n  \u003cli\u003e1 x Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePackage contents are based on the kit configuration described for this listing. Inspect the received parts before disassembly and confirm that the included seal matches your pump cover.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eSwitch off the engine, disconnect the battery where appropriate, and prevent accidental starting.\u003c\/li\u003e\n  \u003cli\u003eClose the raw-water intake seacock before opening the pump.\u003c\/li\u003e\n  \u003cli\u003ePlace an absorbent pad below the pump to catch residual water.\u003c\/li\u003e\n  \u003cli\u003eRemove the pump-cover fasteners and carefully remove the cover plate.\u003c\/li\u003e\n  \u003cli\u003eNote the original impeller blade orientation and remove the old impeller with suitable pliers or an impeller puller.\u003c\/li\u003e\n  \u003cli\u003eClean the pump cavity and remove any broken blade fragments or debris.\u003c\/li\u003e\n  \u003cli\u003eLightly lubricate the replacement impeller with a lubricant approved for the pump and cooling-system application.\u003c\/li\u003e\n  \u003cli\u003eInstall the impeller in the correct rotational orientation for the pump.\u003c\/li\u003e\n  \u003cli\u003eFit the new gasket or O-ring supplied for the matching cover design.\u003c\/li\u003e\n  \u003cli\u003eReinstall the cover evenly and tighten the fasteners to the pump manufacturer's specification.\u003c\/li\u003e\n  \u003cli\u003eOpen the seacock, reconnect the battery if disconnected, and check for leaks and proper cooling-water flow after starting.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I confirm that this kit fits my engine?\u003c\/summary\u003e\u003cp\u003eStart by matching your existing pump or impeller number to the reference table. Then compare the impeller diameter, width, blade count, shaft or spline connection, insert, and cover seal. Engine brand and boat model alone are not sufficient to confirm fitment.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are common signs of a worn impeller?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include reduced cooling-water flow, engine overheating, damaged or missing blades, cracking, hardening, or pieces of impeller material found in the cooling passages. Other cooling-system faults can cause similar symptoms, so inspect the complete system.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should a raw-water impeller be replaced?\u003c\/summary\u003e\u003cp\u003eInspect the impeller according to the engine or pump manufacturer's maintenance schedule. Service intervals vary with operating hours, storage conditions, and exposure to saltwater, sand, or debris. Replace it sooner if it shows cracking, distortion, hardening, or missing blades.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan this kit correct an overheating engine?\u003c\/summary\u003e\u003cp\u003eA damaged raw-water impeller can contribute to overheating, but overheating may also result from a blocked intake, damaged pump housing, thermostat problems, restricted passages, or other faults. Diagnose the complete cooling system before returning the engine to service.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this an OEM part?\u003c\/summary\u003e\u003cp\u003eNo. This is an aftermarket replacement kit. The listed manufacturer and reference numbers are provided for identification and cross-reference only.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs professional installation recommended?\u003c\/summary\u003e\u003cp\u003eImpeller replacement is a routine service operation for experienced boat owners, but access and pump design vary. Use the manufacturer's service procedure and seek professional assistance if the pump configuration, installation direction, or seal arrangement is uncertain.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Information\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify the exact pump and impeller application before purchase.\u003c\/li\u003e\n  \u003cli\u003eDo not operate the engine with the raw-water seacock closed.\u003c\/li\u003e\n  \u003cli\u003eInspect the pump housing, cover plate, wear surfaces, and cooling passages whenever an impeller fails.\u003c\/li\u003e\n  \u003cli\u003eDo not install the part if the dimensions, shaft connection, blade design, or seal profile differs from the original.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMarine Replacement Parts\u003c\/strong\u003e — Service components for routine boat and engine maintenance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication-Focused Listing\u003c\/strong\u003e — Reference numbers and compatibility guidance are provided to support careful part comparison.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment First\u003c\/strong\u003e — Always compare the original part and pump specifications before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723966845243,"sku":"OA-OV3D-KDGW","price":28.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/OA-OV3D-KDGW.png?v=1763038651"}],"url":"https:\/\/seasierra.com\/collections\/indmar-4-stroke-450hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}