Flywheel 3979005

positive OEM
Cummins
Part# 3979005
note
OLD# 3918623
Flywheel stores rotational energy and smooths power delivery in commercial engines.
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Extended Lead Time
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Description

The Cummins Flywheel (3979005) is a mechanical component that stores rotational energy to stabilize engine speed and smooth power transfer to the transmission. It balances rotational forces and dampens vibrations, supporting efficient engine operation in commercial vehicle powertrains.

Key Specifications

  • Application: Cummins 4B3.9, 6B5.9, QSB5.9 30 CM550 engines
  • Function: Stores rotational energy, balances engine rotation, dampens vibrations
  • Compatibility: Cummins B-series, QSB-series engines
  • Construction: High-strength steel disc, precision machined
  • Features: Vibration damping, starter motor engagement surface, clutch interface
  • 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). 

 

For more shipping information, please see our Shipping & Delivery page.

More Information

Current Part# 3979005
Old Part No.: 3918623
Type OEM
Part# variations 3979005 CUM,
3979005CUM
Manufacturer Cummins
Warranty Standard Manufacturer Warranty