0.038 to 0.107 mm [0.0015 to 0.0042 in] 2. Keep It Clean
According to IPD Technical Bulletins , visually inspect the rods for bluish discoloration, which indicates overheating and requires replacement. While the specs above are for "new," used rod bolts have a slightly different tolerance, but it is highly recommended to use new fasteners to ensure the torque-to-yield specs are met accurately.
or an equivalent thread sealant on the main cap joint surfaces if required; avoid sealants that become brittle and could contaminate the bearing. Verification:
Always adhere to the engine manufacturer's specified tightening sequence, which typically begins from the center main bearing and moves outward to ensure even clamping force and prevent distortion. Use a calibrated torque wrench for the initial torque pass, followed by a protractor or angle gauge for the precise final angle turn. cummins isx main and rod bearings torque specs new
: Apply a u-shaped bead of Loctite™ 518 thread sealant to the mating surface of the main cap joint, ensuring it does not enter the bearing shell. Cummins ISX Connecting Rod Bearing Torque Specs (New Bolts)
0.13 to 0.43 mm [0.005 to 0.017 in]. 3. Use an Angle Gauge
Always lubricate the bolt threads and underneath the bolt heads with clean engine oil before installation. or an equivalent thread sealant on the main
The ISX connecting rod bolts have a specific torque-angle that differs slightly from the main bolts. Some older manuals call for a different torque for used vs new bearings – but this guide is for new assemblies. Use the "Wet" (oiled) specification.
After torquing, check for side clearance (side play) between the rod and the crankshaft cheek to ensure the rod is not binding. Essential Best Practices for New Bearings
This guide provides the official torque specifications for new main and connecting rod bearings based on the latest manufacturer standards. 1. Cummins ISX Main Bearing Torque Specs (New) : Apply a u-shaped bead of Loctite™ 518
Always use new main bearing capscrews for a full engine overhaul.
| Component | Fastener Type | Torque Specification (Initial) | Torque Specification (Final) | | :--- | :--- | :--- | :--- | | | Bolts (New) | 300 ft-lbs | + 90° | | Connecting Rod Bolts | Bolts (New) | 29 ft-lbs + Loosen | 52 ft-lbs + 60° | | Connecting Rod Bolts | Bolts (Used) | 52 ft-lbs | + 60° | | Rocker Arm Bolts | Bolts | 50 ft-lbs | - | | Vibration Damper | Bolts | 130 ft-lbs | - | | Flywheel Bolts | Bolts | 92 ft-lbs, then 184 ft-lbs | - |
Torque specs are based on . If you torque a dry bolt to 95 lb-ft, the actual clamping force is 50% lower than a lubricated bolt. Always oil the threads and washer faces of new ISX bolts.