The Cummins ISX engine stands as one of the most dominant heavy-duty powerplants in the North American trucking industry. However, its longevity is entirely dependent on the precision of its internal assembly. Whether you are performing an in-frame overhaul or a complete rebuild, the torque specifications for the main and rod bearings are not merely suggestions—they are the structural foundation of the engine’s rotating assembly.
| Component | Step 1 (Ft-Lbs) | Step 2 (Ft-Lbs or Degrees) | Notes | | :--- | :--- | :--- | :--- | | | 50 ft-lbs | 120 ft-lbs | Center-out sequence | | Main Caps (New/Angle) | 55 ft-lbs | + 90 Degrees | Center-out sequence | | Rod Caps (Standard) | 35 ft-lbs | 80 ft-lbs | Alternate bolts evenly | | Rod Caps (New/Angle) | 22 ft-lbs | + 60 Degrees | Check bolt packaging | cummins isx main and rod bearings torque specs new
| Component | Step | Specification | | :--- | :--- | :--- | | | 1 | 65 lb-ft (snug) | | Rod Nuts | 2 | 75 lb-ft | | Rod Nuts | 3 | +60° (final angle) | The Cummins ISX engine stands as one of