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. CRITICAL: Verify Specifications 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. SKU: 168112
