50-854178 Aftermarket Mercruiser VM/CMD Diesel 2.8L/3.0L/4.2L Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket MerCruiser/Cummins MerCruiser Diesel starter motor - Part Number: 50-854178

A 12-volt eleven-tooth starter for selected VM Motori and Cummins MerCruiser Diesel marine engines. It is used across four-, five- and six-cylinder diesel families including 2.8L, 3.0L, 3.6L and 4.2L installations, subject to the original starter and bellhousing configuration.

The unit replaces earlier Mercury diesel starter 50-801333980 and is also cross-referenced with 50-855507 in aftermarket electrical catalogues.

⚙️ Key Features

• 12V heavy-duty marine diesel starter

• Eleven-tooth pinion

• High-torque construction for diesel compression loads

• Suitable for selected VM and CMD four-, five- and six-cylinder engines

• Complete replacement motor and solenoid assembly

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 50-854178 → Supersedes 50-801333980

OEM / Related Numbers:

• Mercury/MerCruiser: 50-854178

• Mercury/MerCruiser: 50-801333980

• Mercury/MerCruiser: 50-855507

Aftermarket / Verified Equivalents:

• Recmar: REC50-854178

• Aftermarket electrical reference: BOS87

🚤 Compatibility

Commonly used on:

• MerCruiser Diesel, Cummins MerCruiser Diesel and VM Motori marine engines

Typically suits:

• Engine models:

• D2.8L/165

• CMD 2.8L diesel packages

• Selected 3.0L VM/CMD marine diesels

• Selected 3.6L five-cylinder VM marine diesels

• D4.2L/200

• D4.2L/230

• D4.2L/250

• D4.2L/300 D-Tronic

• CMD 4.2L marine diesel packages

• HP Range: Approximately 165HP-300HP

• Engine Type: VM Motori/CMD four-, five- and six-cylinder turbo-diesel marine engine

• Year Range: Approximately 1990s-2000s

• Fitment Note: Confirm 12V system, eleven-tooth drive and bellhousing pattern

🔌 Function

The starter supplies high cranking torque to overcome diesel compression and rotate the engine until fuel injection and combustion become self-sustaining.

Common signs of failure:

• Solenoid clicks but the diesel does not crank

• Slow cranking, particularly when cold

• Starter overheats during short crank cycles

• Pinion fails to engage or disengage

• Intermittent hot-start operation

📦 Condition

• Brand-new aftermarket marine diesel starter

• Supplied as a complete eleven-tooth assembly

• Confirm engine model, voltage and original starter number before installation