Cummins Isx Flywheel Housing Torque Specs ^hot^ Jun 2026

Use new bolts each time (Cummins 3900489). Old bolts will snap at 220+90°.

The flywheel housing on a Cummins ISX engine serves as a critical structural link between the engine block and the transmission or driven equipment. Proper torque application on its mounting fasteners is essential to prevent housing distortion, vibration, oil leaks, and catastrophic failure. This paper specifies the exact torque values, sequence, and preparation for all bolts securing the flywheel housing to the cylinder block, as well as ancillary fasteners (e.g., flywheel housing access covers, rear crankshaft seal housing). Adherence to Cummins standard repair practices (STC) and torque-plus-angle methodology is emphasized. Cummins Isx Flywheel Housing Torque Specs

Depending on your specific ISX model year, a bead of Cummins-approved RTV sealant is typically required. Cummins ISX Flywheel Housing Torque Specifications Use new bolts each time (Cummins 3900489)

Two hollow dowels (one at 3 o’clock, one at 9 o’clock on the block face) ensure concentricity. Proper torque application on its mounting fasteners is

Since you have the housing off, you likely need the flywheel torque specs too.

: Coat bolt threads and the underside of the heads with clean 15W-40 oil before installation.