863681T Mercruiser Engine Cover | Genuine Used Part

🔧 Product Description

Genuine MerCruiser MPI Engine Cover - Part Number: 863681T

A genuine used MerCruiser black engine top cover for selected 4.3L MPI, 5.0L MPI, 350 MAG MPI and MX 6.2L MPI petrol engines.

The moulded cover fits over the upper intake and throttle-body area, improving engine-bay presentation and helping shield the EFI components from accidental contact and loose debris.

⚙️ Key Features

• Genuine Mercury MerCruiser OEM engine cover

• Correct original Mercury part number 863681T

• Superseded by later service cover 879288T66

• Used on selected V6 and small-block V8 MPI engines

• Moulded marine engine-top protective cover

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 879288T66 → Supersedes 863681T

• 863681T → Supersedes 863681

• 863681 earlier OEM engine-cover reference

OEM / Related Numbers:

• 879288T66

• 863681T

• 863681

• 863701 related cover knob

• 863423 related cover-mount bracket

• 401386 related retaining nut

Aftermarket / Verified Equivalents:

• No aftermarket equivalent

🚤 Compatibility

Commonly used on:

• MerCruiser MPI petrol engine upper-intake assemblies

• ECM 555 V6 and small-block V8 sterndrive / inboard engines

Typically suits:

• Engine models:

• MerCruiser 4.3L MPI Alpha / Bravo - serial groups from 0M615000 through 1A063240 and above where specified

• MerCruiser 5.0L MPI Alpha / Bravo - serial 0M600000 to 1A299999

• MerCruiser 350 MAG MPI Alpha / Bravo - serial 0M600000 to 1A299999

• MerCruiser 350 MAG MPI Horizon Alpha / Bravo - serial 0M600000 to 1A299999

• MerCruiser 350 MAG MPI Ski - serial 0M300000 through 1A089999

• MerCruiser 350 MAG MPI Horizon MIE - serial 0M310000 through 1A089999

• MerCruiser 350 MAG MPI MIE - serial 0M310000 through 1A089999

• MerCruiser MX 6.2L MPI Ski - serial 0M317000 through 0W689999

• MerCruiser MX 6.2L MPI Horizon MIE - serial 0M310000 through 1A089999

• MerCruiser MX 6.2L MPI MIE - serial 0M310000 through 1A089999

• HP Range: Engine-family controlled

• Engine Type: MerCruiser 4.3L V6 and 5.0L / 5.7L / 6.2L MPI petrol engine

• Year Range: Approximately 2002 - 2008

🔌 Function

The cover shields upper-engine EFI components from accidental contact and loose debris while providing the original finished appearance. It is not a sealed air-cleaner housing and must be installed with the correct mounting hardware.

Common signs of failure:

• Cover is cracked or heat-distorted

• Mounting points are broken

• Retaining knob or mounting hardware is missing

• Cover rubs against the throttle linkage or wiring

• Surface is heavily damaged or no longer mounts securely

📦 Condition

• Genuine used part

• Removed from running engine where applicable

• In good working condition unless otherwise stated