Using an impact wrench for the final step is highly discouraged; only a calibrated torque wrench should be used for the final 184 ft-lb pull to prevent bolt snapping or crankshaft thread damage. Cummins ISX15 & X15 Flywheel Torque Specs - JustAnswer
Use a wire brush or solvent to remove old thread locker or debris from both the bolt threads and the crankshaft holes. torque spec for flywheel bolts on isx cummins 251 updated
Note: Some later X15 variations specifically list 185 ft-lb as the final value. Always verify with your Engine Serial Number (ESN) using the Cummins QuickServe or Cummins Insight program for the most precise data for your build. 1. Preparation and Cleaning Using an impact wrench for the final step