Platinum Driveline Cummins 5.9L B Series Engine Flywheel OE# 3921263

Cummins Flywheel 3921263 | 5.9L B Series Engine

Name: Cummins Flywheel 3921263 | 5.9L B Series Engine
Brand: Platinum Driveline
SKU: 168112
Availability: InStock

$210.00

Fitment Lookup:

Select your vehicle to verify compatibility before ordering.

SKU: 168112 Categories: Truck Flywheels - Medium Duty & Semi Truck, VIEW ALL PRODUCTS Brand: Platinum Driveline

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.