Out-of-round main bores cause the crankshaft to flex. That kills the thrust bearing in 200 hours.
Use a paint pen to mark the bolt heads after Step 2. This provides a visual reference to ensure every bolt has been rotated exactly 60 degrees. 📏 Installation Best Practices cummins isx main and rod bearings torque specs new
: Retighten in numerical sequence to 52 ft-lb (70 N•m). Verification : Verify all bolts are at 52 ft-lb . Final Angle : Rotate the capscrews an additional 60 degrees . Installation Tips and Clearances ISX Cummins Main and Rod Bolt Torque Specs Guide Out-of-round main bores cause the crankshaft to flex