Flywheel Ring Gear 3978313

positive OEM
Cummins
Part# 3978313
note
Toothed ring gear for starter motor engagement in heavy-duty engine flywheels.
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Description

The Cummins Flywheel Ring Gear (3978313) is a toothed gear component that engages with the starter motor to initiate engine cranking. It is a critical part of the flywheel assembly, facilitating the transfer of rotational energy from the engine to the transmission for smooth operation in heavy-duty vehicles.

Key Specifications

  • Application: Cummins 4B3.9, 5.9L, 6.7L, 4.5L, 7.2L Series
  • Function: Starter motor engagement and rotational energy transfer
  • Compatibility: Cummins B-Series engines, ISB, QSB, ISBE, ISD
  • Construction: High-strength steel gear with precision-machined teeth
  • Features: Toothed ring gear, designed for starter pinion mesh, wear-resistant surface
  • Quality: OEM Cummins part

Shipping Info

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More Information

Current Part# 3978313
Type OEM
Part# variations 3978313 CUM,
3978313CUM
Manufacturer Cummins
Warranty Standard Manufacturer Warranty