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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 3903309 | 3902133, 390213300, 390330900, C3902133

Manufacturer: Cummins
Part#: 3903309
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Ensure smooth and reliable engine starting with this high-quality flywheel ring gear designed for Cummins B and C series engines. Featuring 173 teeth, it offers precise engagement and long-lasting durability under heavy-duty conditions.

Description

High-Performance Flywheel Ring Gear for Cummins Engines

Restore the starting efficiency of your heavy-duty diesel engine with this premium flywheel ring gear. Engineered to meet rigorous industry standards, this ring gear features 173 precision-cut teeth to ensure seamless starter motor pinion engagement, preventing premature wear and starting failures.

Technical Specifications:

  • Part Number: 3903309
  • Number of Teeth: 173
  • Width: 14 mm
  • Inner Diameter: 412 mm
  • Outer Diameter: 442.8 mm

Engine Compatibility:

This flywheel ring gear is designed for Cummins B and C series engines, commonly found in agricultural, construction, and automotive applications. Compatible models include:

  • Cummins 6BT 5.9
  • Cummins 6CT 8.3
  • Cummins ISB 5.9
  • Komatsu S6D102

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