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Mercury MerCruiser 375HP 4-Stroke Marine Engine Parts

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This page focuses on Mercury MerCruiser 375HP 4‑Stroke sterndrive/inboard engines. Use it to find compatible parts and service guidance, including maintenance tips, common replacement items, and troubleshooting steps. You can also browse the main MerCruiser collection. Scroll to the bottom of this page to start browsing parts for this engine, and 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 375HP Model

  • Locate the serial plate: typically on the starboard valve cover, flame‑arrestor tag, or ECM sticker for the engine, and on the transom assembly for the Bravo drive.
  • Model decoding: 8.2L “Horizon” (closed‑cooling) vs MAG (raw‑water) variants; DTS indicates Digital Throttle & Shift. Serial number breaks determine gasket, pump, and sensor changes.
  • Drive package: Note Bravo One/Two/Three outdrive and gear ratio; many anodes, bellows, and prop/hub parts are drive‑specific.
  • 4‑Stroke V8 MPI platform: Multi‑port injection and closed‑cooling (Horizon) require correct impeller, thermostat, and hose kits matched to your serial range.

Engine Overview

MerCruiser 8.2L V8 “Horizon” (approx. 375 HP)

Feature Description
Configuration Naturally aspirated 8.2L (502 cid) GM‑based V8, MPI fuel injection, 4‑stroke; often paired with Digital Throttle & Shift (DTS). Horizon packages use closed‑cooling.
Common Models Examples include MerCruiser 8.2L Horizon 375hp DTS with Bravo I/II/III packages. Verify exact serial for component changes.
Advantages Strong low‑end torque, smooth DTS shifting, corrosion resistance with closed‑cooling, and broad parts availability.
Notes Many service parts interchange across 8.2L big‑block families, but impellers, gaskets, hoses, anodes, and prop hardware often depend on serial number and drive type.

Routine Maintenance & Service Parts

Intervals below are typical guidelines; always follow your official MerCruiser service manual and serial‑number‑specific recommendations.

Item Interval* Remarks Parts Link
Engine oil + filter After break‑in, then every 100 hrs or annually Use marine‑grade oil; replace filter at every oil change MerCruiser Service & Maintenance Kits
Gear oil (Bravo drive) Every 100 hrs or annually Inspect magnetic drain plug and seals; check for water intrusion MerCruiser
Spark plugs Inspect 100 hrs; replace ~300 hrs or 3 years Gap per manual; replace sooner if misfire or fouling Spark Plugs
Fuel filter / water‑separating filter Every 100 hrs or annually Drain or replace more often with ethanol fuel or contamination MerCruiser Fuel Filters
Raw‑water pump impeller Every 2–3 seasons (annual in sandy/silty water) Watch running temp; replace if overheats or stream is weak MerCruiser Impellers
Thermostat & housing gaskets Inspect annually; replace 2–3 years or if temp is unstable Horizon (closed‑cooling) uses specific thermostat ratings MerCruiser
Anodes (engine & drive) Inspect every 50 hrs; replace when 50% depleted Use correct alloy for your water (aluminum, zinc, or magnesium) MerCruiser Anodes
Bellows (u‑joint, exhaust, shift) Inspect annually; replace 2–3 years or at first cracking Prevent water intrusion and bearing damage Bellows
Serpentine belt Inspect every 100 hrs; replace on cracks/glazing Noise or voltage swings can indicate belt slip/tensioner wear Belts

Frequently Used Parts Categories

Common Symptoms & Quick Checks

Symptom Check First Related Parts
Overheat alarm or high temp Inspect sea intake screens, raw‑water impeller, hoses, thermostat; verify coolant level on Horizon packages Water pump impeller kit, thermostat, hoses, anodes/intake screens
Poor acceleration or power loss Check fuel quality, water‑separating filter, spark plugs, prop condition/pitch Fuel filter, spark plugs, propeller/hub, injectors
Hard starting or rough idle Inspect plugs, fuel pressure, vacuum leaks, idle air control; confirm clean flame arrestor Spark plugs, fuel filter, injectors, sensors
Gearcase noise or metal in gear oil Check gear oil condition, prop shaft seal area, u‑joints, gimbal bearing; inspect bellows Seals, bearings, bellows, prop hardware
Charging issues (low or unstable voltage) Test alternator output, belt condition/tension, and grounds Alternator, belt, tensioner, electrical connectors

FAQs

Are parts interchangeable across different years or 8.2L variants?

Many 8.2L V8 components are shared, but pumps, gaskets, sensors, and anodes often change at specific serial breaks and by Bravo drive type. Always confirm via engine and drive serial numbers.

When should I replace the raw‑water impeller?

Inspect annually and replace every 2–3 seasons under normal use, or every season in sandy/silty or high‑heat environments, or any time you see overheat warnings or reduced cooling flow.

How often should gear oil be changed?

Typically every 100 hours or annually. Change sooner if the oil appears milky, burned, or contaminated with metal shavings, and correct the cause before further operation.

What information helps confirm compatibility?

Provide engine serial number, drive serial number (Bravo I/II/III), model designation (e.g., 8.2L Horizon 375hp DTS), and any existing part numbers. Photos of the nameplate and the part you are replacing are also helpful.

Ready to find parts by horsepower, year, and model? Browse the main MerCruiser collection and refine with the Filter & Sort controls.

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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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