3916854 Aftermarket Cummins 4B/BT & 6B/BT/BTA Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Cummins B-Series / MerCruiser Diesel Starter Motor - Replaces Part Number: 3916854

New aftermarket Nikko/Delco-pattern offset gear-reduction starter replacing Cummins 3916854. It is a 12-volt, approximately 2.9kW clockwise unit with a 10-tooth pinion and shares the 3604654RX cross-reference family.

⚙️ Key Features

• 12-volt electrical system

• Approximately 2.9kW rated output

• Clockwise rotation viewed from the drive end

• 10-tooth pinion

• Offset gear-reduction / OSGR construction

• Complete new starter motor with integrated solenoid

• Marine or engine-grade corrosion-resistant construction

• Direct replacement only after voltage, rotation, tooth count and mounting pattern are confirmed

🧰 Kit / Assembly Contents

• 1 × Complete starter motor assembly - P/N 3916854

• 1 × Integrated starter solenoid and shift mechanism

• 1 × Installed pinion gear and overrunning clutch/Bendix assembly

• 1 × Installed armature, field-magnet/winding, brush holder and drive housing

• Mounting bolts, electrical cables and external relays are transferred or renewed separately unless supplied

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 3916854 ↔ Cross-references 3604654RX and the Cummins 3604481/3604482/3604648/3901365/3901386/3904445/3905480/3909913 family

OEM / Related Numbers:

• 3916854

• 3604654RX

• 3604481RX

• 3604482RX

• 3604648RX

• 3901365

• 3901386

• 3904445

• 3905480

• 3909913

• 3918376

• Mercury 50-805991

Aftermarket / Verified Equivalents:

• WAI/Lester: 6573N / 6583N family

• Recmar: PH150-0008

• Delco 28MT starter family

🚤 Compatibility

Commonly used on:

• Cummins B-series and documented MerCruiser diesel starting systems

Typically suits:

• Engine / Generator models:

• Cummins 4B and 4BT 3.9-litre

• Cummins 6B, 6BT and 6BTA 5.9-litre

• MerCruiser 7.3L Bravo MIE NAV 444, principally 1994-1996, where Mercury 50-805991 is specified

• HP / Output Range: Engine-rating dependent

• Year Range: Engine build-list and serial dependent

• Starter Identification: Confirm 12V, 2.9kW, 10 teeth and the original 3916854/3604654 family.

🔌 Function

The starter motor converts battery electrical energy into high-torque mechanical rotation to crank the engine. When the start circuit energises the solenoid, the pinion moves into the flywheel ring gear and the motor turns the crankshaft until the engine starts. The overrunning clutch then protects the starter as engine speed rises.

Common signs of failure / incorrect starter fitment:

• No-crank condition even though the battery and start-control circuit test correctly

• Solenoid clicks but the starter motor does not rotate

• Starter turns slowly, draws excessive current or overheats the battery cables

• Pinion spins without engaging the flywheel ring gear

• Grinding, clashing or repeated pinion kick-out during cranking

• Intermittent cranking caused by worn brushes, solenoid contacts or heat soak

• Corrosion, water intrusion, burnt windings or excessive shaft/bearing play

📦 Condition

• New aftermarket replacement starter motor

• Brand new

• Supplied in original or equivalent packaging