What is your specific or model year? Are you using new or used mounting bolts?
Specific torque values can vary based on the bolt size and exact engine model (such as the ISX15 or the newer X15). Always verify these specs against your specific Engine Serial Number (ESN) using resources like Cummins QuickServe Online Flywheel Housing Torque Specifications Cummins Isx Flywheel Housing Torque Specs
The flywheel housing is not just a cover; it is a structural component connecting the rear of the engine block to the transmission bell housing. What is your specific or model year
For standard Cummins ISX15 and X15 engines, the flywheel housing-to-block mounting bolts are typically torqued in two stages: for the first stage and a final torque of 145 ft-lb . These specifications are critical for preventing oil leaks and maintaining proper engine-to-transmission alignment. Core Torque Specifications Always verify these specs against your specific Engine