Mercury 4-Stroke 380HP Marine Engine Parts

(1 products)

This page is tailored for Mercury 4-Stroke 380HP outboard engines. It helps you find compatible parts and practical service information, including maintenance tips, commonly replaced items, and troubleshooting guidance. You can also browse our main Mercury collection for a wider selection. Scroll to the bottom of this page to start browsing parts for this engine, and remember that on the collection page you can use the Filter & Sort controls to narrow by horsepower, year range, and part category.

Browse All Mercury Parts

How to Identify Your 380HP Model

Locate the serial/nameplate on the transom bracket or swivel bracket; note the full serial number and any model designator.
Decode suffixes for shaft length (L/XL/XXL), control type (mechanical vs. DTS), and steering/mount style (standard mounts vs. AMS).
4-stroke high-output platforms may appear as either supercharged inline-6 (earlier Verado style) or later V8/V10 designs; cowl shape and intake layout help distinguish them.
Record rigging details (propeller pitch, gear ratio shown in the manual, and helm controls) to ensure correct parts selection.

Platform Overview

High‑Output Inline‑6 (Supercharged Verado Family)

Feature	Description
Configuration	Inline‑6, supercharged 4‑stroke outboard with integrated power steering on many rigs.
Common Models	High‑output Verado inline‑6 variants in the 350–400 HP range; some installations may be calibrated near 380 HP.
Advantages	Strong mid‑range torque, smooth NVH, and robust charging capacity for electronics.
Notes	Supercharger drive and cooling components are service‑critical; use correct anodes and water pump kits for your serial range.

High‑Output V8/V10 (Later 4‑Stroke Platforms)

Feature	Description
Configuration	Large‑displacement 4‑stroke V‑configuration outboard; often paired with Advanced MidSection (AMS) mounts and digital controls.
Common Models	Later high‑output 4‑stroke families in the 350–400 HP class, with some installations targeting ~380 HP.
Advantages	Refined noise/vibration control, strong alternator output, and broad propeller compatibility.
Notes	Verify shaft length and gearcase style (e.g., heavy‑duty) before ordering impeller kits, seals, and anodes.

Routine Maintenance & Service Parts

Intervals below are typical guidelines for high‑output 4‑stroke outboards. Always follow the maintenance schedule and specifications in your official service manual.

Item	Interval*	Remarks	Parts Link
Engine oil & filter	Every 100 hours or annually	Use the correct oil grade and high‑capacity filter for your platform.	Oil Filters
Gear oil (lower unit)	Every 100 hours or annually	Inspect for water intrusion and metal debris at each change.	Mercury Lower Unit Seal Kits
Spark plugs	Inspect 100 hours; replace 200–300 hours or as needed	Gap and heat range must match the specific platform.	Spark plug
Fuel filter / water‑separating filter	Every 100 hours or annually	Replace more often with ethanol or contaminated fuel exposure.	Fuel Filters
Water pump impeller / kit	Every 2–3 seasons (or sooner in sandy/silty water)	Critical for cooling at high load; inspect housing and wear plate.	Mercury Water Pump Repair Kits
Anodes (sacrificial)	Inspect every 50 hours; replace when 50% worn	Match material to water type (aluminum, magnesium, or zinc).	Anodes

Frequently Used Parts Categories

Routine Service – Service & Maintenance Kits
Cooling System – Water Pump Impeller Rebuild Kits
Fuel System – Fuel Filters
Ignition / Electrical – Electrical Items
Corrosion Protection – Anodes
Gearcase & Seals – Mercury Lower Unit Seal Kits
Propulsion – Propellers

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Weak tell‑tale stream or overheat alarm	Inspect intake screens for blockage; verify impeller condition; confirm thermostat operation.	Water pump kit, impeller, thermostat, intake screen
Poor acceleration or power loss	Check propeller for damage/cavitation; replace fuel filter; verify clean plugs.	Propeller, fuel filter, spark plugs
Hard starting or rough idle	Confirm battery health and connections; inspect plugs; look for water in separator.	Spark plugs, fuel filter/water separator, sensors
Gearcase noise or metal in gear oil	Check oil level/color; pressure test for seal leaks; inspect for fishing line at propshaft.	Lower unit seal kit, bearings, gear oil

FAQs

Are parts interchangeable between different 380HP platforms?

Some service parts cross over, but many items differ between inline‑6 supercharged and V‑platform engines (mounting, gearcase, anodes, filtration, and cooling components). Always verify by serial number and configuration before ordering.

How often should I replace the water pump impeller?

In typical use, replace the impeller every 2–3 seasons, or sooner for sandy/silty operation. If you see weak water flow or high temperature warnings, service the pump immediately.

How often should I change lower unit gear oil?

Change gear oil every 100 hours or annually. Inspect for water or metallic debris, which can indicate seal or gear wear issues.

What information helps confirm compatibility?

Provide the engine serial number, shaft length (L/XL/XXL), control type (mechanical or DTS), and any notes on gearcase type. Photos of the nameplate and current part also help ensure a precise match.

Ready to find parts by horsepower, year, and model? Browse the full Mercury catalog and use the filters to narrow to your 380HP setup.

Shop Mercury Outboard Parts

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.