Some ISX15 and X15 variations use a two-step process: Step 1: 100 N·m [74 ft-lb] Step 2: 197 N·m [145 ft-lb] Installation Procedure & Sequence
The Cummins ISX is not a small-block Chevy. Its flywheel housing torque specs are precise for a reason: for the main M12 bolts, plus a 90° angle turn for TTY bolts. Cummins Isx Flywheel Housing Torque Specs
Do not torque to the final value immediately. Some ISX15 and X15 variations use a two-step
: Tighten all bolts following a crisscross or star pattern , typically starting from the center and moving outward. Essential Alignment Checks (Runout) Cummins Isx Flywheel Housing Torque Specs