Indmar 4-Stroke 375HP Marine Engine Parts

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Dedicated to Indmar 4‑Stroke 375HP inboard marine engines, this page helps you identify compatible parts and understand key service information. Below you 19ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main service kits collection. Scroll to the bottom of this page to start browsing parts for this engine, and remember you can use the 22Filter & Sort 22 controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 375HP Model

Locate the engine serial/nameplate: commonly found on the intake manifold area, starboard side of the block, or near the bellhousing/engine mount bracket.
Check ECM and emissions labels: the ECM tag and emissions decal often list the engine family and calibration that help confirm parts compatibility.
Decode model suffixes: options may indicate raw-water vs. closed cooling, transmission/V-drive pairing, and accessory drive differences (which affect belts and pumps).
Confirm platform characteristics: 4-stroke V8 EFI inboard configurations share many service items, but pulleys, pumps, and brackets can vary by year and boat builder installation.

Engine Overview

V8 EFI Inboard Platform (375HP class)

Feature	Description
Configuration	V8 4-stroke, multi-port fuel injection (EFI), inboard marine package with marine-specific cooling and ignition components.
Common Models	375HP variants used in popular tow/ski boats; confirm by serial number, ECM calibration, and cooling system type.
Advantages	Strong low-end torque for watersports, smooth operation, and straightforward seasonal service with widely available consumables.
Notes	Impellers, belts, filters, and anodes are routine replacements. Cooling and accessory layouts vary by year/installation dverify fit using your engine serial/nameplate.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 4-stroke inboard engines. Always follow the official service manual for your exact engine and usage conditions.

Item	Interval*	Remarks	Parts Link
Engine Oil + Filter	50 60 hrs or annually	Use marine-approved oil and the correct filter thread/height for your bracket and clearance.	Oil Filters
Spark Plugs	100 300 hrs or 2 3 seasons	Inspect gap and ceramic condition; replace sooner with heavy towing or poor fuel quality.	Spark Plugs
Fuel Filter / Water Separator	50 100 hrs or annually	Replace the spin-on or inline element; drain water as needed to prevent power loss.	Fuel Filters
Raw Water Pump Impeller / Kit	Annually or 100 hrs	Critical for cooling; replace proactively, especially after dry run or debris ingestion.	Impellers
Anodes (heat exchanger/pencil, if equipped)	Inspect every 50 hrs; replace at 50% loss	Protects against corrosion in raw/brisackish water; more frequent checks in salt.	Anodes
Serpentine / Accessory Belt	Inspect 50 hrs; replace 2 3 seasons	Replace if cracked, glazed, or noisy; belt routing can vary by bracket set.	Belts
Air Filter / Flame Arrestor Service	Inspect 50 hrs; clean/replace annually	Maintain clear airflow; clean with suitable solvent if serviceable, or replace as needed.	Air Filters

*Intervals shown are typical for recreational use; shorten intervals for heavy-duty or harsh environments.

Frequently Used Parts Categories

Routine Service Kits 2D Service & Maintenance Kits
Cooling System 2D Water Pumps
Fuel System 2D Fuel Filters
Ignition / Electrical 2D Starters
Charging System 2D Alternators
Corrosion Protection 2D Anodes
Gaskets & Seals 2D Gaskets

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Overheat alarm / high temperature	Inspect raw water intake screen/strainer, check impeller condition, verify seawater hoses and clamps, and confirm thermostat operation.	Water pump kit, impeller, hoses, thermostat, anodes
Poor acceleration / power loss	Check fuel quality, replace fuel/water separator, inspect spark plugs, and look for restricted flame arrestor/air filter.	Fuel filter, injectors, spark plugs, air filter
Hard starting / rough idle	Verify battery state of charge, inspect plugs and ignition leads, check for vacuum leaks and idle air control issues.	Spark plugs, sensors, air filter
Battery not charging / warning lamp	Confirm belt tension/condition, measure alternator output at idle and cruise RPM, and inspect harness/connectors for corrosion.	Alternator, belt, connectors

FAQs

Are parts interchangeable across different years or installations?

Many service items are common across 375HP V8 platforms, but bracket sets, pumps, sensors, and belt lengths can vary by year and boat builder. Always confirm with your engine serial/nameplate and component photos before ordering.

When should I replace the raw water pump impeller?

Annually or every 100 hours is a common guideline. Replace sooner if you see low flow, overheating, or after any dry run. Keeping a spare impeller onboard is recommended.

How often should engine oil be changed?

Typical intervals are every 50 60 hours or at least once per season. Severe duty (frequent towing, high heat, or saltwater) may require shorter intervals. Use marine-rated oil and the correct filter.

What information helps confirm part compatibility?

Provide a clear photo of the engine nameplate/serial, any ECM or emissions label, cooling system type (raw vs. closed), and pictures/measurements of the existing part (e.g., belt routing, pump faceplate, or filter thread).

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If you 19re unsure about your model, send us a photo of the nameplate and the part you need and we 19ll help verify compatibility.