Ensure the bearing tangs are properly seated in the machined notches of the rods and block.
Some early ISX (CM570/870) used a non-TTY bolt. For those: torque is 84 lb-ft + 30 degrees . Verify your bolt length. cummins isx main and rod bearings torque specs new
For bolts, you are not tightening to a specific ft-lbs number; you are tightening to a specific clamp load achieved via yield. Here are the raw specs first, followed by the engineering logic. Ensure the bearing tangs are properly seated in
Rod cap tightening sequence:
| Component | Step | Specification | | :--- | :--- | :--- | | | 1 | 65 lb-ft (snug) | | Rod Nuts | 2 | 75 lb-ft | | Rod Nuts | 3 | +60° (final angle) | Verify your bolt length
Like the main bearings, the rod bearing cap bolts and studs should be tightened in a specific sequence to ensure even pressure distribution. The recommended sequence is: