PCM 350HP 4-Stroke Marine Engine Parts

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This page is for PCM 350HP 4‑Stroke marine engines. Use it to find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse our main parts collections to locate service items that fit many PCM V8 applications. Scroll down to the bottom of the page to start browsing parts for this engine. On the collection page, use the Filter & Sort controls to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 350HP Model

Nameplate/Serial plate: Typically found near the bellhousing area, on or near the intake manifold/engine cover, or on brackets close to the ECM. Record the full model and serial number.
Model code basics: PCM small‑block V8s are often labeled MP5.7L (5.7L/350 CID). Suffixes can indicate rotation (LH/RH), cooling layout, or drive type (Direct Drive vs V‑Drive).
Drive type differences: V‑Drive engines place the transmission behind a V‑drive unit; Direct Drive couples the transmission straight to the shaft. Some parts (mounts, brackets, hose routing) vary by drive type.
Pump/Accessory layout: PCM 5.7L engines from the early‑2000s era may use belt‑driven, crank‑driven, or serpentine raw water pumps. Verify your pump style before ordering impellers and seals.

Engine/Platform Overview

PCM 5.7L V8 (350 CID) – Direct Drive

Feature	Description
Configuration	GM‑based 5.7L V8, multi‑port fuel injection, 4‑stroke marine inboard
Common Models	MP5.7L Pro Sport / Excalibur variants (early‑2000s era)
Advantages	Strong mid‑range torque, familiar small‑block serviceability, widely available service items
Notes	Verify raw‑water pump type (belt, crank, or serpentine). Fuel Control Cell (FCC) and ignition components vary slightly by year/serial.

PCM 5.7L V8 (350 CID) – V‑Drive

Feature	Description
Configuration	5.7L V8 with transmission and V‑drive; cooling and accessory routing adapted to V‑drive layout
Common Models	MP5.7L V‑Drive (e.g., PowerPlus/Walter set‑ups in ski/wake boats)
Advantages	Compact drivetrain packaging, good wake/tow characteristics
Notes	Some brackets, hoses, and FCC plumbing differ vs. Direct Drive. Confirm cooler and hose fittings, and FCC filter style by serial.

Routine Maintenance & Service Parts

Intervals below are general guidelines for PCM 4‑stroke V8 inboards. Always follow the official service manual for your exact model, year, and serial number.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Every 50–100 hours or annually	Use marine‑approved oil and change the filter at each service	Oil Filters
Transmission / V‑Drive fluid	Inspect often; replace ~100 hours or annually	Check your gearbox’s specific fluid type and capacity	Service & Maintenance Kits
Spark plugs	Inspect every 50 hours; replace ~100 hours	Verify plug type/heat range for your ECM calibration	Spark Plugs
Fuel filter / FCC filter	Every 100 hours or annually	Replace the canister/filter inside the Fuel Control Cell (FCC) as applicable	Fuel Filters
Raw water impeller	Annually or 100 hours (sooner if water stream weak)	Confirm pump style (belt, crank, serpentine) for correct kit	Impellers
Anodes (heat exchanger/engine)	Inspect 50 hours; replace when 50% depleted	Protects cooling components from corrosion	Anodes
Serpentine/V‑belt	Inspect 50 hours; replace 2 years or as needed	Check for glazing/cracks; verify tensioner operation	Belts

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Oil & Filters: Oil Filters
Cooling System: Water Pumps
Fuel System: Fuel Filters
Ignition / Electrical: Sensors
Exhaust & Manifolds: Manifolds
Belts & Hoses: Hoses

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak water stream or overheat alarm	Inspect intake screen/strainer, raw‑water impeller, thermostat, heat‑exchanger for restriction; verify anodes	Water pump/impeller kit, thermostat, anodes, heat‑exchanger end caps
Poor acceleration / power loss	Check FCC fuel filter, low‑pressure and high‑pressure fuel pumps, fuel quality; inspect spark plugs and wires	FCC filter, fuel pump, spark plugs, ignition wires
Hard starting / rough idle	Clean throttle body, verify IAC valve, check MAP/ECT sensors and vacuum leaks	IAC valve, throttle body gasket, sensors (MAP/ECT), spark plugs
Transmission runs hot or shifts poorly	Verify fluid level/condition; inspect transmission cooler for flow and hose kinks; confirm raw‑water supply	Transmission cooler, raw‑water pump kit, hoses/clamps
Charging/voltage warning	Inspect serpentine/V‑belt condition and tensioner; test alternator output and grounds	Belt, belt tensioner, alternator, ground leads

FAQs

Are parts interchangeable between different years or platforms?

Many wear items are shared across PCM 5.7L variants, but details like raw‑water pump style, hose routing, FCC components, and sensor connectors can change by serial and by Direct Drive vs V‑Drive. Always confirm by model/serial and drive type.

When should the raw‑water impeller be replaced?

Replace annually or every 100 hours, whichever comes first. If the water stream weakens, you ingest debris, or the engine overheats, inspect and replace sooner.

How often should transmission or V‑drive fluid be changed?

As a rule of thumb, inspect frequently and service around 100 hours or annually. Use only the fluid type specified for your gearbox and operating conditions.

What information helps confirm part compatibility?

Please provide the full engine model and serial number, rotation (LH/RH if known), drive type (Direct Drive or V‑Drive), raw‑water pump style, and any part numbers or photos of the existing component.

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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.