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Illustrative photo — the delivered item may differ in appearance. Orders are fulfilled by catalog part number (SKU).

Flywheel Ring Gear Cummins 3902127 | J902127, 390212700, CU3902127

Manufacturer: Cummins
Part#: 3902127
Cross References:
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Ensure reliable engine starts and smooth power transmission with this premium flywheel ring gear for Cummins 6CT, ISC, ISL, QSC, and QSL engines. Featuring 138 teeth and a 22mm width, it is engineered for precise fitment and long-lasting durability.

Description

High-Durability Flywheel Ring Gear for Cummins Engines

Restore the starting reliability of your heavy-duty diesel engine with this premium-grade Flywheel Ring Gear (Part Number: 3902127). Specifically engineered for Cummins C-Series and L-Series engines, this ring gear ensures seamless starter motor engagement and smooth power transmission under demanding operating conditions.

Key Specifications

  • Part Number: 3902127
  • Number of Teeth: 138T
  • Width: 22 mm
  • Material: High-strength carbon steel for maximum wear resistance and longevity

Engine Compatibility

This flywheel ring gear is designed to fit a wide range of Cummins medium and heavy-duty diesel engines, including:

  • Cummins 6CT 8.3
  • Cummins ISC 8.3 / ISC 8.9
  • Cummins ISL 8.3 / ISL 8.9 / ISL 9
  • Cummins QSC 8.3
  • Cummins QSL 8.9 / QSL 9

Interchange & Cross-Reference Numbers

This part is fully interchangeable with the following reference numbers:

  • J902127
  • 390212700
  • CU3902127

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