Description
CUMMINS FLYWHEEL 3921263 | 5.9L B SERIES ENGINE
Maximize the performance of your diesel fleet with this premium Platinum Driveline heavy-duty flywheel. Specifically engineered for the Cummins 5.9L B Series engine, this component is designed to meet the high-torque demands of both commercial automotive applications and heavy-duty industrial equipment. Manufactured to exacting OEM specifications, it ensures consistent power transfer and long-term durability in professional work environments.
Verified Casting & Part Numbers
- OE#: 3921263
- INTERCHANGE: 3908574
Technical Specifications
- Engine Application: Cummins 5.9L B Series
- Bore Diameter: 7.25-inch bore size
- Disc Outside Diameter: 14″
- Ring Gear Teeth: 173
- Ring Gear #: 3903309
- Mounting Holes: 8
- Locating Holes: 0
- Pilot Bearing #: 206SS / 305SS
- Condition: New Aftermarket (No Core Charge)
Expert Installation & Field Note
Drawing from our shop experience specializing in heavy-duty drivetrains since 1985, the Cummins 5.9L B Series requires a clean crankshaft flange to prevent lateral runout. Since this unit has 0 locating holes, it is critical to ensure proper center alignment before torquing the 8 mounting bolts in a star pattern. We recommend verifying your starter drive engagement with the 173-tooth ring gear during assembly to ensure reliable starting performance.
Please confirm your engine model and original casting number match these specifications. The 7.25-inch bore size and 173-tooth ring gear are essential for proper fitment and vehicle safety.
Shipping Note: All flywheel orders are drop-shipped directly to ensure the fastest delivery. We are not responsible for carrier delays and cannot guarantee that overnight orders will ship the same day.
Note: Prices shown are for online orders only.
