Torque Spec For Flywheel Bolts On Isx Cummins 251 Updated Jun 2026

: Always use a crisscross or star pattern to ensure even distribution of pressure and prevent warping. Associated Components

Disclaimer: These specifications are based on standard Cummins ISX service bulletins. Always consult the official Cummins QuickServe Online (QSOL) portal or the specific service manual for your Engine Serial Number (ESN), as production changes can occur. torque spec for flywheel bolts on isx cummins 251 updated

Properly securing the flywheel is essential to prevent drivetrain vibrations and potential engine damage . The following specs apply to the most recent ISX and X15 models: 185 ft-lb Flywheel Bolts (Step 1): 92 ft-lb Flywheel Housing Bolts: 145 ft-lb Clutch Pressure Plate: 40–50 ft-lb Installation Procedure Anyone have the TQ spec for isx flywheel bolts : Always use a crisscross or star pattern

For the Cummins ISX (particularly the 871 and 2350 engine codes, covering most EGR and early SCR models using the updated “Microalloy” or “251” bolt), the final torque specification is . Note: Do not confuse this with the older, now-superseded 210 N·m spec. Properly securing the flywheel is essential to prevent

Cummins generally classifies these flywheel bolts as Torque-to-Yield (TTY) . Because they are stretched during installation, Cummins recommends replacing the bolts with new hardware whenever the flywheel is removed. If reusing old bolts, inspect threads closely for stretching or damage, but new bolts are the best practice to prevent flywheel wobble or failure.

For the Cummins ISX engine, the current flywheel bolt torque specification is typically . However, some newer or updated specific models, such as the ISX15 and X15, may require a two-stage process ending at 185 ft-lb . Torque Specifications & Procedure