| Step | Action | | :--- | :--- | | [ ] | New bolts installed (rod and main). | | [ ] | Threads clean & dry (or oil per your engine's spec). | | [ ] | Plastigauge verified within spec. | | [ ] | Torque wrench calibrated within last 12 months. | | [ ] | Angle gauge used for TTY steps (do not guess 90°). | | [ ] | Rotating torque checked (2-5 lb-ft drag with bearings). |
If clearances are too tight, the bearing will seize; too loose, and you will lose oil pressure. ⚠️ Warning: Engine Generation Differences cummins isx main and rod bearings torque specs new
Tighten both capscrews on the main bearing cap to 150 ft-lb (203 N•m). Step 2: Loosen both capscrews completely. Step 3: Tighten to a base torque of 110 ft-lb (149 N•m). | Step | Action | | :--- |
Using main and connecting rod bearings requires strict adherence to Cummins’ proprietary torque-plus-angle procedure. Unlike old-school engines where you just set a click-type wrench to 150 lb-ft, the ISX uses a torque-to-yield (TTY) methodology, specifically a Torque + Angle specification. | | [ ] | Torque wrench calibrated within last 12 months
| Component | Step | Specification | | :--- | :--- | :--- | | | 1 | 65 lb-ft (snug) | | Rod Nuts | 2 | 75 lb-ft | | Rod Nuts | 3 | +60° (final angle) |
The sequence is critical to prevent warping the crankshaft or distorting the block.