8M0054588 Aftermarket Mercruiser Ignition Coil 4.3L, 5.0L, 5.7L & 6.2L MPI | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement ECM555 MPI Ignition Coil - Replaces Part Number: 8M0054588

New aftermarket ignition coil replacing MerCruiser 8M0054588 for ECM555 MPI engines using the flat-cap HVS distributor.

⚙️ Key Features

• Direct replacement for 8M0054588

• Designed for ECM555 distributor ignition

• Supports V6 and small-block V8 MPI engines

• Cross-references Volvo Penta 3861985

• Marine epoxy-filled high-voltage construction

🧰 Kit / Assembly Contents

• 1 × Ignition coil - Part Number: 8M0054588

• Coil bracket and distributor-to-coil lead are serviced separately unless included

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 8M0054588 → Supersedes/cross-references 392-863704T and 392-863704

OEM / Related Numbers:

• 392-863704

• 392-863704T

• 3861985

Aftermarket / Verified Equivalents:

• Sierra: 18-5465

• Recmar: REC3861985

• Aftermarket ECM555 marine ignition-coil equivalents

🚤 Compatibility

Commonly used on:

• MerCruiser and Volvo Penta ECM555 MPI distributor ignition systems

Typically suits:

• Engine / Equipment models:

• 4.3L MPI V6

• 5.0L MPI V8

• 5.7L/350 Mag MPI V8

• 6.2L/377 MPI V8

• HP / Output Range: Approximately 220HP - 350HP

• Engine / System Type: GM Vortec V6 or small-block V8 petrol marine engine with HVS distributor

• Year Range: Approximately 2001 - 2015; serial 0M300000-2A455878 where specified

• Serial / Component Identification: Confirm ECM555 HVS ignition; distributorless 8.1L uses individual coils.

🔌 Function

The ignition coil converts battery voltage into the high voltage required to fire the spark plugs. The engine-control or ignition module switches the coil primary circuit to produce a timed spark.

Common signs of failure / service requirement:

• Crank/no-start with weak or absent spark

• Misfire that worsens as the engine or coil heats up

• Rough idle, hesitation or loss of power

• Cracked housing, corrosion or high-voltage leakage

• Incorrect primary or secondary resistance and repeated ignition-module faults

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging