Torque Spec For Flywheel Bolts On Isx Cummins 251 Updated May 2026

Warning: The manufacturer typically does recommend Loctite for flywheel bolts on these models unless specified for a custom performance application. 2. Mounting the Flywheel Align the flywheel onto the crankshaft dowels.

The official Cummins specification for flywheel bolts typically involves two primary stages to reach the final clamping load: Tighten to 92 ft-lb (125 N•m). Step 2: Tighten to 184 ft-lb (250 N•m). Step 1 Torque Final Step Torque Flywheel Bolts 92 ft-lb (125 N•m) 184-185 ft-lb (250 N•m) Clutch Cover (Pressure Plate) 30 ft-lb (3/8 bolts) 40–50 ft-lb (Total) Flywheel Housing 150 ft-lb (203 N•m) torque spec for flywheel bolts on isx cummins 251 updated

Cummins often recommends replacing flywheel bolts if they show signs of stretching or damage. Using an impact wrench for the final step

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 Repeat the star pattern

Before final assembly, it is good practice to push the crankshaft toward the front of the engine to eliminate end clearance while checking for runout.

To prevent warping and ensure the flywheel sits flush against the crankshaft, use a : Stage 1: Tighten all bolts in the star pattern to 92 ft-lb .

Repeat the star pattern, tightening all bolts to the final value of 184–185 ft-lb .