Cummins Isx Main And Rod Bearings Torque Specs New
| Component | Specification | | --- | --- | | Bolt type | M16 x 2.0 Property Class 10.9 (Wet torque) | | Lubrication | Clean 15W-40 engine oil (not assembly lube on threads) | | Step 1 Torque | 90 lb-ft (122 N·m) | | Step 2 Torque | 130 lb-ft (176 N·m) | | Step 3 (Final) | Angle-turn +90 degrees |
Note: On older ISX CM570/CM870, the final step may be +60 degrees instead of 90. Check your engine serial number. cummins isx main and rod bearings torque specs new
Scenario A: Standard Rod Bolts
Scenario B: New Style Rod Bolts (Angle Torque/Micro-Encapsulated) | Component | Specification | | --- |
Rod bearings connect the pistons to the crankshaft. The ISX utilizes a "fractured cap" design on the connecting rods. The cap is cracked off the rod during manufacturing, creating a unique, interlocking fit. Do not mix caps between rods. Note: On older ISX CM570/CM870, the final step
| Component | Step 1 (Ft-Lbs) | Step 2 (Ft-Lbs or Degrees) | Notes | | :--- | :--- | :--- | :--- | | Main Caps (Standard) | 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 |
Why the loosen step? This resets the friction coefficients. By loosening and retorquing, you ensure the micro-surface asperities are flattened, allowing the 105° angle to provide precise plastic deformation (yield) of the bolt.