{"title":"Crusader 4-Stroke 370HP Marine Engine Parts","description":"\u003csection id=\"hero\" style=\"padding:16px; border:1px solid #e5e5e5; border-radius:8px;\"\u003e\n  \u003cp\u003eThis page is dedicated to Crusader 4-Stroke 370HP marine engines. Use it to find compatible parts, routine service information, and practical troubleshooting tips. You can also browse our main Crusader collection for service and maintenance kits. Scroll to the bottom to start browsing parts for this engine, and remember: on the collection page you can use the “Filter \u0026amp; Sort” controls to narrow results by horsepower, year range, and part category\/section.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/crusader-service-maintenance-kits\" style=\"display:inline-block; padding:10px 14px; background:#0a4; color:#fff; text-decoration:none; border-radius:6px;\"\u003eBrowse All Crusader 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 370HP Model\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eLocate the serial\/model plate: commonly on the intake\/engine cover bracket, bellhousing area, or near the flame arrestor. Record the model, serial, and rotation (LH\/RH) if shown.\u003c\/li\u003e\n    \u003cli\u003eModel code details: Crusader model codes often indicate rotation (LH\/RH), cooling type (raw-water cooled vs. fresh-water\/heat-exchanger), and accessory variations. Suffixes may note harness type and bracket revisions.\u003c\/li\u003e\n    \u003cli\u003ePlatform cues: Many 370HP packages are GM-based V8 multi-port injected (MPI) inboards. Late-2000s engines may use returnless fuel systems and CAN\/ECM updates; earlier 2000s engines commonly use an FCC (Fuel Control Cell) with serviceable internal filter.\u003c\/li\u003e\n    \u003cli\u003eCooling system type: Fresh-water cooled engines have a heat exchanger with sacrificial zincs (anodes). Raw-water only variants route seawater through the block differently—identify before ordering pumps, thermostats, and hoses.\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  \u003ch3\u003e6.0L V8 MPI (Approx. 370–375 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 #ddd; padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; 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 #f0f0f0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eGM-based 6.0L V8, multi-port injection (MPI), 4-stroke gasoline inboard with serpentine accessory drive (later years)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003e370–375 HP variants; rotation may be LH or RH depending on installation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eStrong mid‑range torque, robust MPI drivability, improved charging and belt serviceability with serpentine drive\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 use a heat exchanger (fresh-water cooling) plus a raw-water pump and oil\/transmission coolers. Later systems may be returnless fuel with external Racor-style water separator; earlier setups use an FCC canister with internal high‑pressure pump and filter.\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003e5.7L V8 MPI (Related Platform, 2000s)\u003c\/h3\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eFeature\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; 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 #f0f0f0;\"\u003eConfiguration\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eGM-based 5.7L V8, MPI, 4-stroke gasoline inboard; FCC or returnless fuel depending on year\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eCommon Models\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003e300+ HP range; LH or RH rotation available; multiple harness\/relay and bracket variations by year\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eAdvantages\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f0f0f0;\"\u003eProven reliability, broad parts availability, straightforward routine service\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eNotes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eBe mindful of rotation, cooling configuration, and fuel system type (FCC vs. returnless) when selecting fuel pumps, filters, brackets, and hoses.\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 recreational use. Always follow the official service manual for your exact model, year, and operating environment.\u003c\/p\u003e\n  \u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eItem\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eInterval*\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eRemarks\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; 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 #f6f6f6;\"\u003eEngine oil \u0026amp; filter\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eUse marine-rated oil; warm the engine before draining; replace filter each service\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\"\u003eOil Filters\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eFuel\/water separator (Racor style)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eInspect 50 hrs; replace 100 hrs or as needed\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eDrain water regularly; replace element at first sign of restriction or contamination\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\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 #f6f6f6;\"\u003eFCC canister filter (if equipped)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003e100–200 hours\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eDepressurize fuel system; replace seal\/O-ring; verify no leaks after priming\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/crusader-service-maintenance-kits\"\u003eCrusader Service \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 #f6f6f6;\"\u003eRaw-water pump impeller\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eEvery 100 hours or annually\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eReplace more frequently in sandy\/silty or high-temperature environments\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/impellers\"\u003eImpellers\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eSpark plugs\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003e200 hours or 2 years\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eCheck gap and condition; replace if fouled or worn\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\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 #f6f6f6;\"\u003eSerpentine\/alternator belt\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eInspect 100 hours; replace if cracked\/noisy\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eCheck tensioner and idler pulleys for bearing noise\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/belt\"\u003eBelts\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eHeat exchanger anodes (zincs)\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eInspect monthly in salt\/brackish; replace when 50% depleted\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\u003eProtects the cooling system from galvanic corrosion\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f6f6f6;\"\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;\"\u003eTransmission fluid and cooler service\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003ePer gearbox manufacturer schedule\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eVerify fluid spec (e.g., Velvet Drive, ZF\/Hurth). Inspect cooler and lines for restrictions\/leaks.\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003e\u003ca href=\"https:\/\/seasierra.com\/collections\/service-maintenance-kits\"\u003eService \u0026amp; Maintenance Kits\u003c\/a\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/section\u003e\n\n\u003csection id=\"common-parts\" style=\"margin-top:24px;\"\u003e\n  \u003ch2\u003eFrequently Used Parts Categories\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eRoutine Service Kits – \u003ca href=\"https:\/\/seasierra.com\/collections\/crusader-service-maintenance-kits\"\u003eCrusader Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eCooling System (Impellers, Pumps, Hoses) – \u003ca href=\"https:\/\/seasierra.com\/collections\/impellers\"\u003eImpellers\u003c\/a\u003e | \u003ca href=\"https:\/\/seasierra.com\/collections\/water-pumps\"\u003eWater pumps\u003c\/a\u003e | \u003ca href=\"https:\/\/seasierra.com\/collections\/hoses\"\u003eHoses\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eFuel System (Filters, Pumps) – \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-filters-1\"\u003eFuel Filters\u003c\/a\u003e | \u003ca href=\"https:\/\/seasierra.com\/collections\/fuel-pumps\"\u003eFuel Pumps\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eIgnition \u0026amp; Electrical – \u003ca href=\"https:\/\/seasierra.com\/collections\/spark-plug\"\u003eSpark plug\u003c\/a\u003e | \u003ca href=\"https:\/\/seasierra.com\/collections\/alternators\"\u003eAlternators\u003c\/a\u003e | \u003ca href=\"https:\/\/seasierra.com\/collections\/sensors\"\u003eSensors\u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003eLubrication \u0026amp; Filtration – \u003ca href=\"https:\/\/seasierra.com\/collections\/oil-filters\"\u003eOil Filters\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\u003eGaskets \u0026amp; Seals – \u003ca href=\"https:\/\/seasierra.com\/collections\/gaskets\"\u003eGaskets\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 #ddd; padding:8px;\"\u003eSymptom\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; padding:8px;\"\u003eCheck First\u003c\/th\u003e\n        \u003cth style=\"text-align:left; border-bottom:1px solid #ddd; 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 #f4f4f4;\"\u003eOverheat or high temperature alarm\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eRaw-water pump impeller condition, belt\/tensioner, seawater strainer blockage, thermostat operation, heat exchanger anodes\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eImpeller kit, water pump, hoses, anodes, thermostat\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eHard starting \/ rough idle\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eFuel\/water separator and FCC filter restriction, IAC valve cleanliness, MAP\/ECT sensor connections, spark plug condition\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eFuel filters, sensors, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003ePoor acceleration \/ power loss\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eFuel pressure supply (low-pressure pump, FCC\/returnless plumbing), clogged flame arrestor, ignition misfire\u003c\/td\u003e\n        \u003ctd style=\"padding:8px; border-bottom:1px solid #f4f4f4;\"\u003eFuel pumps, fuel filters, spark plugs\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:8px;\"\u003eCharging light on \/ low voltage\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eBelt condition and tensioner, alternator output wiring and grounds, corroded connectors\u003c\/td\u003e\n        \u003ctd style=\"padding:8px;\"\u003eBelts, alternators, sensors\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 5.7L and 6.0L Crusader platforms?\u003c\/summary\u003e\n    \u003cp\u003eSome accessories and service items cross over (filters, anodes, many ignition parts), but many components are platform- or year-specific (fuel system plumbing, brackets, sensors, cooling hoses, belt lengths). Always verify by model\/serial and cooling\/fuel system type before ordering.\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\u003eAnnually or every 100 hours—whichever comes first. Replace sooner if you operate in sandy\/silty water or see any overheating or reduced flow.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow often should I change transmission fluid?\u003c\/summary\u003e\n    \u003cp\u003eFollow the schedule in your gearbox manual (Velvet Drive or ZF\/Hurth). Many recreational applications service annually or every 200 hours. Inspect the oil cooler and lines when changing fluid.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat information helps confirm part compatibility?\u003c\/summary\u003e\n    \u003cp\u003eProvide engine model and serial number, rotation (LH\/RH), cooling type (raw-water vs. fresh-water\/heat exchanger), fuel system (FCC vs. returnless), and year range. Photos of the nameplate and existing parts are very helpful.\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 #e5e5e5; border-radius:8px;\"\u003e\n  \u003cp\u003eReady to find the right parts? Browse our Crusader collection and use the filters for horsepower, year, and model to narrow results.\u003c\/p\u003e\n  \u003ca href=\"https:\/\/seasierra.com\/collections\/crusader-service-maintenance-kits\" style=\"display:inline-block; padding:10px 14px; background:#0a4; color:#fff; text-decoration:none; border-radius:6px;\"\u003eShop Crusader Service \u0026amp; Maintenance Kits\u003c\/a\u003e\n  \u003cp style=\"margin-top:8px; color:#555;\"\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":[],"url":"https:\/\/seasierra.com\/collections\/crusader-4-stroke-370hp-marine-engine-parts.oembed","provider":"SeaSierra","version":"1.0","type":"link"}