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Indmar 4-Stroke 380HP Marine Engine Parts

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This page supports owners of Indmar 4‑Stroke 380 HP marine engines with compatible parts guidance and service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting help. You can also browse our main parts categories by brand and system. Scroll to the bottom to start browsing parts, and remember that on collection pages you can use the Filter & Sort controls to narrow results by horsepower, year range, and part category.

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How to Identify Your 380HP Model

  • Locate the engine identification label or serial plate on the intake/rocker cover, bell housing, or front accessory bracket. The ECM may also have a decal with the serial and calibration code.
  • Record the full model/serial and any suffixes (these can indicate emissions calibration, drive/transmission option, or year family).
  • Confirm displacement and platform (e.g., 5.7L, 6.0L, 6.2L V8 EFI). A 4‑stroke V8 with electronic fuel injection is typical for this horsepower class.
  • If the boat has closed cooling, note whether it’s half‑ or full‑system; thermostat and coolant parts differ from raw‑water–only engines.

Engine Platform Overview

V8 EFI 4‑Stroke Inboard

Feature Description
Configuration GM‑based V8 4‑stroke with multi‑port EFI; raw‑water or closed‑cooling; belt‑driven raw‑water pump.
Common Models Examples include 5.7L/6.0L/6.2L EFI V8 variants used in watersports boats of this output class.
Advantages Strong mid‑range torque, reliable EFI starting, wide parts availability, and straightforward routine service.
Notes Verify thermostat rating by platform; impeller size and belt routing vary by pump and bracket set. Fuel and oil filter styles differ across years—match by serial and filter thread/cartridge type.

Routine Maintenance & Service Parts

Intervals below are general guidelines for a 4‑stroke V8 marine engine. Always follow your engine’s official service manual and operating conditions.

Item Interval* Remarks Parts Link
Engine oil + oil filter Every 100 hours or annually Warm engine before draining; replace crush washer if equipped. Oil Filters
Transmission fluid (inboard) 100–300 hours or annually Use spec fluid; service cooler and lines; change filter if serviceable. Service & Maintenance Kits
Spark plugs Every 300 hours or 3 years Match heat range and gap to engine calibration; inspect leads. Spark Plugs
Fuel filter / water separator Every 100 hours or annually Replace spin‑on and/or inline elements; drain water as needed. Fuel Filters
Raw‑water pump impeller Every 100 hours or annually Replace sooner if run dry or after overheat; carry a spare. Impellers
Thermostat Every 2–3 years Use the correct temperature rating for your platform and cooling system. Service & Maintenance Kits
Anodes (engine/heat exchanger) Inspect every 50–100 hours; replace when 50% consumed Choose zinc (salt), aluminum (brackish), or magnesium (fresh) as appropriate. Anodes
Accessory belt Inspect each 50 hours; replace 2 years or if cracked Verify length/rib count by bracket set and alternator size. Belts

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Overheat alarm / running hot Inspect seawater intake for blockage, raw‑water impeller condition, belt tension, and thermostat operation. Impeller kit, water pump, thermostat, hoses
Poor acceleration or power loss Check fuel quality, replace water‑separating filter, verify fuel pressure, inspect spark plugs. Fuel filter, fuel pump, injectors, spark plugs
Hard starting / rough idle Confirm battery voltage, scan for ECM fault codes, inspect IAC/air leaks, and plug condition. Sensors, spark plugs, fuel filter, gaskets
Transmission noise or slipping Verify fluid level/condition, cooler restriction, and coupling alignment. Transmission fluid/filter, hoses, seals
Battery not charging Test alternator output, belt condition, connections, and main fuse/breaker. Alternator, belt, electrical connectors

FAQs

Are parts interchangeable between different years or platforms?

Some filters, belts, sensors, and ignition parts cross between year ranges, but many components (thermostats, impellers, brackets, ECM‑related parts) are platform‑specific. Always match by engine serial/model and cooling system type.

When should I replace the raw‑water impeller?

Annually or every 100 hours, whichever comes first. Replace immediately if the engine has overheated or the pump ran dry. Keep a spare impeller and gasket on board.

How often should transmission fluid be changed?

Most inboard transmissions specify 100–300 hours or annually. Use the correct fluid type and service any in‑line screen or filter if equipped. Heat exchanger coolers should be inspected for debris.

What information helps confirm part compatibility?

Provide engine serial/model, displacement (e.g., 5.7L/6.0L/6.2L), cooling system (raw‑water vs. closed), and photos of the existing part (filters, pump, belts). This ensures the correct thread size, cartridge style, belt length, or kit variant.

Ready to service your Indmar 4‑Stroke 380 HP engine? Browse by category or start with complete service kits to match your maintenance schedule.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.
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