Cummins Isx Flywheel Housing Torque Specs May 2026

The ISX relies on two hollow dowel pins (located at roughly 2 o’clock and 8 o’clock) for concentric alignment. The torque spec is useless if these pins are missing or damaged. when replacing the housing.

| Component | Fastener Size | Torque (Nm) | Torque (lb-ft) | Notes | |-----------|--------------|-------------|----------------|-------| | | M12 x 1.75 (10.9 grade) | 125 | 92 | Critical : Must be torqued in sequence | | Flywheel housing to rear gear train housing | M10 x 1.5 | 65 | 48 | Applies to ISX where housing splits | | Flywheel to crankshaft | M14 x 1.5 (special) | 220 + 90° | 162 + 90° | Tighten in 3 passes (see below) | | Starter motor to housing | M12 x 1.75 | 65 | 48 | Use thread locker | | Rear engine mount to housing | M16 x 2.0 | 300 | 221 | Use new bolts | | Access plate / inspection cover | M8 x 1.25 | 25 | 18 | Even pattern | Cummins Isx Flywheel Housing Torque Specs

The flywheel housing is a critical component of the Cummins ISX engine, responsible for housing the flywheel and providing a mounting point for the transmission. The flywheel housing is designed to withstand the stresses of engine operation, including the torque and rotational forces generated by the engine. The ISX relies on two hollow dowel pins