Starting Motor 3971603

positive OEM
Cummins
Part# 3971603
note
OLD# 3971603
Electric motor providing engine cranking torque for commercial diesel engines.
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Extended Lead Time
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Description

The Cummins Starting Motor (3971603) is an electric motor designed to initiate engine operation by converting electrical energy into mechanical torque. It engages the engine’s flywheel to crank the engine, enabling start-up under various operating conditions. This component is essential for reliable engine ignition in commercial vehicle applications.

Key Specifications

  • Application: Tier 3 5.9L B engines, QSB3.9, QSB4.5, QSB5.9, QSB6.7 series
  • Function: Converts electrical energy to mechanical torque for engine cranking
  • Compatibility: 4B3.9, 6B5.9, B4.5, B5.9 G, ISB CM550, QSB3.9 30 CM550, QSB4.5 CM850, QSB5.9 30 CM550, QSB5.9 44 CM550, QSB6.7 CM850
  • Construction: Steel housing, copper windings, planetary gear set
  • Features: 12-volt operation, clockwise rotation, 10-tooth pinion gear, planetary gear reduction
  • Quality: OEM Cummins part

Shipping Info

Next Day Air services are available for In Stock items. Our shipping cutoff time is Monday - Friday 4:30pm Eastern Standard Time (EST). 

 

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More Information

Current Part# 3971603
Old Part No.: 3971603
Type OEM
Part# variations 3971603 CUM,
3971603CUM
Manufacturer Cummins
Warranty Standard Manufacturer Warranty