21423488 Aftermarket Volvo Penta D4/D6 Starter Motor | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Volvo Penta D4/D6 High-Torque Starter Motor - Replaces Part Number: 21423488

New aftermarket high-torque starter replacing Volvo Penta 21423488 for selected D4 and D6 common-rail marine diesels. It is a 12-volt, 3.6kW clockwise unit with an 11-tooth pinion and three-bolt mounting nose.

⚙️ Key Features

• 12-volt electrical system

• 3.6kW rated output

• Clockwise rotation viewed from the drive end

• 11-tooth pinion

• Three-bolt heavy-duty gear-reduction mounting

• 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 21423488

• 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:

• 21423488 → Supersedes/cross-references 3803938, 3801296, 874501, 3841359, 3588491 and 3594614

OEM / Related Numbers:

• 21423488

• 3803938

• 3801296

• 874501

• 3841359

• 3588491

• 3594614

Aftermarket / Verified Equivalents:

• Recmar: REC21423488

• Aftermarket Volvo Penta D4/D6 12V 3.6kW starter

🚤 Compatibility

Commonly used on:

• Volvo Penta D4/D6 common-rail marine diesel starting systems

Typically suits:

• Engine / Generator models:

• D4-180, D4-210, D4-225, D4-260 and D4-300 applications using this starter

• D6-280 and D6-310 applications using this starter

• HP / Output Range: Approximately 180HP - 310HP

• Year Range: Engine-serial dependent D4/D6 production

• Starter Identification: Confirm 12V rather than 24V, 11 teeth and three-bolt mounting. Newer F/G-series engines may use different starters.

🔌 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