Mercury MerCruiser 360HP 4-Stroke Marine Engine Parts

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This page is focused on Mercury MerCruiser 360HP 4‑Stroke marine engines. Use it to find compatible parts and service information, including maintenance intervals, commonly replaced items, and quick troubleshooting guidance. You can also browse the main MerCruiser collection. Scroll to the bottom of this page 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 360HP Model

Locate serial numbers: the engine serial plate is typically on the starboard side of the block or near the flame arrestor; the transom assembly and sterndrive each have their own serial plates.
Read the model designation: note displacement (e.g., 6.2L vs 8.2L), fuel system (EFI/MPI), cooling type (raw water vs closed cooling), and drive family (Alpha/Bravo). These details affect parts selection.
Distinguish platforms: both are 4‑stroke V8s; small‑block vs big‑block layouts differ in exhaust, accessory brackets, and raw‑water pump location.
Record calibration labels and alternator output if present; these help match ignition, belt, and electrical components.

Engine / Platform Overview

V8 EFI 4‑Stroke Sterndrive (Small‑Block)

Feature	Description
Configuration	V8 gasoline, EFI/MPI, 4‑stroke sterndrive with raw‑water or closed‑cooling options.
Common Models	Examples include 6.2L V8 variants near the 360 HP range (actual features vary by year and calibration).
Advantages	Strong mid‑range torque, broad parts availability, and efficient fuel delivery via EFI.
Notes	Match parts by engine serial number; cooling type and drive family (Alpha/Bravo) influence pump, exhaust, and anode selections.

V8 EFI 4‑Stroke Sterndrive (Big‑Block)

Feature	Description
Configuration	V8 gasoline, EFI, 4‑stroke sterndrive; higher displacement with heavy‑duty cooling and exhaust components.
Common Models	Examples include 8.2L V8 variants around and above the 360 HP class (specs vary by year and option).
Advantages	High output with robust cooling and exhaust; suitable for heavier boats or performance setups.
Notes	Exhaust elbows/risers, raw‑water pump style, and belt routing differ; verify parts using engine and drive serial numbers.

Routine Maintenance & Service Parts

Intervals below are general guidelines for MerCruiser 4‑stroke sterndrive engines. Always follow the official service manual and local operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hrs or annually	Use the oil grade specified in the manual; replace filter at each oil change.	MerCruiser Oil Filters
Drive gear lube	Every 100 hrs or annually	Drain and refill; inspect magnet and seals for water intrusion or metal.	MerCruiser Service & Maintenance Kits
Spark plugs	Inspect 100 hrs; replace ~300 hrs or 3 yrs	Check gap and condition; replace sooner if fouled or misfiring.	Spark Plugs
Fuel/water separator & inline filters	Every 100 hrs or each season	Replace more often with ethanol fuel or contaminated fuel.	MerCruiser Fuel Filters
Raw‑water pump impeller	Every 2 seasons or 200 hrs	Replace sooner if sand/silt use, overheating, or weak tell‑tale is observed.	MerCruiser Impellers
Anodes (zinc/aluminum/magnesium)	Inspect monthly; replace at ~50% loss	Select alloy for water type (salt/brackish/fresh); ensure good electrical contact.	MerCruiser Anodes
Serpentine/alternator belt	Inspect every 100 hrs; replace ~2 yrs	Check tensioner and pulleys; replace if cracked or glazed.	Belts
U‑joint, exhaust, and shift bellows	Inspect annually; replace 2–3 yrs	Cracked bellows cause water intrusion and drive damage; replace clamps as needed.	Bellows & Clamps

Frequently Used Parts Categories

Routine Service — MerCruiser Service & Maintenance Kits
Cooling System — MerCruiser Impellers
Fuel System — MerCruiser Fuel Filters
Ignition / Electrical — Electrical Items
Corrosion Protection — MerCruiser Anodes
Propulsion — MerCruiser Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Overheat alarm or weak water flow	Inspect raw‑water pump impeller, intake screens, seawater hoses, and thermostat operation.	Water pump/impeller kit, thermostat, intake screen, hoses, anodes.
Poor acceleration or power loss	Check propeller for damage/slip, replace fuel filter, inspect spark plugs, verify throttle travel.	Propeller/hub kit, fuel filter, spark plugs, control linkage components.
Hard starting or rough idle	Confirm battery voltage, examine fuel quality, check plugs and ignition leads, inspect for air leaks in fuel supply.	Spark plugs, fuel filter, starter/battery cables, fuel hoses and clamps.
Gearcase noise or metal in gear lube	Change gear lube and inspect magnet; check for water intrusion, prop shaft seal damage, and bellows condition.	Service kit, seals, bellows, gear lube, prop shaft hardware.

FAQs

Are parts interchangeable between different years or platforms?

Not always. Mid‑year updates, cooling configuration, and drive family (Alpha vs Bravo) affect fitment. Always confirm with the engine and drive serial numbers before ordering.

When should I replace the raw‑water pump impeller?

As a rule of thumb, every 2 seasons or ~200 hours, and immediately if you observe overheating, weak flow, or if the boat is used in sandy/silty water.

How often should the drive gear oil be changed?

At least every 100 hours or annually. Change sooner if water intrusion is suspected or after propeller‑strike events.

What information do I need to confirm part compatibility?

Provide the engine serial number, transom/drive serial number, displacement (6.2L or 8.2L), cooling type (raw vs closed), and drive family. Photos of labels and the part you are replacing are very helpful.

Ready to find the right parts? Browse the main MerCruiser collection and use the filters to refine by horsepower, year, and model.

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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.