21103718 Starter Motor | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta 24-volt, 7.5 kW heavy-duty starter motor used on D12 and TAD/TWD12 marine, generator and industrial engines. The three-bolt reduction starter uses a clockwise 12-tooth drive and a 92 mm mounting spigot. Its high output is matched to the compression and flywheel ring gear of the 12-litre engine family.

🚤 Compatibility

Typically suits:

• Volvo Penta TWD1240VE
• Volvo Penta TAD1241GE
• Volvo Penta TAD1242GE
• Volvo Penta TAD1240GE
• Volvo Penta TAD1241VE
• Volvo Penta TAD1242VE
• Volvo Penta TAD1241-42VE

• Engine Family: TWD, TAD

⚙️ Key Features

• 24-volt, 7.5 kW reduction starter motor
• Clockwise rotation with 12-tooth pinion
• Three-bolt mounting and approximately 92 mm locating spigot
• High-torque design for 12-litre Volvo Penta diesel engines
• Engine type: 12-litre inline-six diesel, 24-volt starting system
• Also supersedes Volvo part number 3803923

🔌 Function

Engages the flywheel ring gear and cranks the engine at the speed required to develop compression heat and begin fuel combustion.

⚠️ Common Signs of Failure

• Slow or laboured cranking with correct battery voltage
• Solenoid engagement without armature rotation
• Grinding or incomplete pinion engagement
• Excessive starter current and hot battery cables
• Intermittent operation from worn brushes, contacts or armature components

🛠️ Service Notes

• Disconnect the batteries before touching starter cables, and label the main and control connections as they come off
• Inspect the ring gear teeth before fitting a new motor; a chipped or worn ring gear will ruin the new pinion
• Mount the motor square on clean faces with whatever shims the installation uses, so pinion engagement matches what the workshop manual for your engine specifies — never leave shims out to make it fit
• Clean the main and earth terminals back to bright metal, tighten to the specified figure and refit the insulating boots; a great many failed starters are really voltage drop in the cables and earth path
• Crank with the engine unable to start first, listening for clean engagement and release, then feel the terminals for heat after several attempts

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21103718 → Supersedes 3586798

OEM / Related Numbers

• 3801288 earlier number superseded by this part
• 3586798 related reference
• 3801289 related reference
• 3803838 related reference
• 3827444 related reference
• 874385 related reference
• M009T84079 related reference

Other-Brand OEM Numbers

• Mitsubishi M009T82179 / M9T82179
• Prestolite M105R3513SE
• MAHLE: MS 1032
• Delco Remy 19081032 / DRS0546
• Mitsubishi Electric: M009T84079
• Mitsubishi Electric: M9T84079
• Prestolite: M105713

Aftermarket / Verified Equivalents

• Delco Remy: DRS0546
• Delco Remy: 19081032
• WAI: 84079
• HC-Cargo: 114729
• PSH: 811.509.123
• AS-PL: S5062
• Remy: DRS0546
• Elstock: 455403

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging