Some ISX engines have small side bolts on the center (thrust) main cap:
Before you install the oil pan and fire up that ISX, run this checklist: cummins isx main and rod bearings torque specs new
Always lubricate the threads and the underside of the bolt heads with clean engine oil before installation. Tighten in numerical sequence to [ ] . Step 2: Loosen the bolts completely in numerical sequence. Step 3: Re-tighten in numerical sequence to [ ] . Step 4: Verify the torque is still at [ ] . Step 5: Rotate the bolts an additional 60∘60 raised to the composed with power . Main Bearing Cap Torque Specs Some ISX engines have small side bolts on
Note: Some technicians recommend an initial seating pass of followed by completely loosening the bolts before starting the final torque sequence to ensure the cap is fully seated. Connecting Rod Bearing Torque Specs Step 3: Re-tighten in numerical sequence to [ ]
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.
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).
When installing rod bolts, use the following sequence as specified by technical guides like IPD and JustAnswer :