GM 151HP 4-Stroke Marine Outboard Engine Parts

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This page is dedicated to GM 4‑Stroke 151 HP outboard engines. Use it to find compatible replacement parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main GM/MerCruiser collection. Scroll to the bottom to start browsing parts for this engine, and remember you can use the Filter & Sort controls on the collection page to narrow results by horsepower, year range, and part category.

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How to Identify Your 151 HP Model

Locate the identification plate on the transom clamp bracket or swivel bracket. It lists model designation, serial number, and production information.
Decode the model: the core model is followed by suffixes for shaft length (S/L/XL), starting/controls (manual/electric, tiller/remote), and year or revision code.
Confirm stroke and platform: 4‑stroke inline‑4 models use an oil filter and engine oil service; 2‑stroke models do not. If your cowling references EFI and an oil filter, it is a 4‑stroke.
Note gearcase details: standard vs. heavy‑duty gearcase and prop hub type affect propeller and seal kit selection.

Engine Overview

Inline‑4 EFI 4‑Stroke (150–155 HP class)

Feature	Description
Configuration	Inline‑4, EFI 4‑stroke, typically DOHC with freshwater cooling via raw‑water pump in the lower unit.
Common Models	151 HP 4‑stroke outboard variants with standard or XL shaft lengths and remote control configurations.
Advantages	Good fuel economy, smooth idle, strong mid‑range torque, and broad parts availability for routine service.
Notes	Use NMMA FC‑W marine oil of the correct viscosity. Replace the water pump impeller regularly and inspect anodes in salt/brackish water.

Routine Maintenance & Service Parts

Intervals below are general guidelines for 4‑stroke outboards. Always follow the specific schedule and specifications in your engine’s service manual.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	Initial 20 hours, then every 100 hours or annually	Use NMMA FC‑W marine oil; replace filter at each oil change	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion or metal particles; replace drain gaskets	Lower Unit Seal Kits
Spark plugs	Every 200 hours or 2 years (inspect annually)	Check gap and replace if fouled or worn	Spark Plugs
Fuel filter / water separator	Every 100 hours or annually	Drain or replace more often with ethanol fuel or contamination	Fuel Filters
Water pump impeller/kit	Every 2–3 seasons (inspect annually)	Critical for cooling; replace sooner for sand/silt use	Water Pump Impeller Rebuild Kits
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace when 50% consumed	Choose material for your water type: salt, brackish, or fresh	Anodes

Frequently Used Parts Categories

Routine Service: Service & Maintenance Kits
Cooling System: Water Pumps and Impellers
Fuel System: Fuel Filters and Fuel Pumps
Ignition / Electrical: Starters and Sensors
Corrosion Protection: Anodes
Propulsion: Propellers
Drivetrain: Lower Unit Seal Kits

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale or overheat alarm	Inspect intake screens for blockage; verify impeller condition; check thermostat operation	Water pump impeller kit, intake screen, thermostat
Poor acceleration / power loss	Check propeller for damage or incorrect pitch; inspect fuel filter and for water in fuel; check plug condition	Propeller, fuel filter/water separator, spark plugs
Hard starting / rough idle	Verify battery health and connections; inspect spark plugs and ignition leads; look for vacuum leaks	Starter, spark plugs, sensors (MAP/IAT), gaskets/hoses
Gearcase noise or metal in gear oil	Check oil level and condition; inspect prop shaft seal area for fishing line; pressure/vacuum test if needed	Lower unit seal kit, drain plug gaskets, propeller hub components

FAQs

Are parts interchangeable between different years or platforms?

Many routine items (filters, anodes, spark plugs) cross between years, but components tied to the model code (gearcase, ignition, sensors) may differ. Verify by model/serial number and part dimensions before ordering.

When should the impeller be replaced?

Inspect annually and replace every 2–3 seasons, or sooner if operating in sandy/silty water, after an overheat event, or if water flow is weak.

How often should gear oil be changed?

Typically every 100 hours or annually. Change immediately if you see milky oil (water intrusion) or metallic debris.

What information helps confirm part compatibility?

Provide model and serial number, shaft length, control type (tiller/remote), year or code suffix, and any measurements (e.g., prop diameter/pitch, seal dimensions).

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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.