Cummins Isx Main And Rod Bearings Torque Specs New Updated [4K]
Ensure your torque wrench and torque-angle meter are calibrated. The ISX relies heavily on Torque-Plus-Angle sequencing. Cummins ISX Main Bearing Torque Specs
Always lubricate the threads and under the bolt heads with clean engine oil before installation.
Rotate the capscrews an additional 60 degrees . 4. Summary Table: ISX New Bearing Torque Step 2 (Optional) Step 3 (Final) Rod Bearings +60∘positive 60 raised to the composed with power Angle Turn Main Bearings +60∘positive 60 raised to the composed with power Angle Turn cummins isx main and rod bearings torque specs new
Clean the back of the bearing shells and the housing bores with a non-residue cleaner (like brake cleaner).
Last updated: October 2024 – Verified against Cummins Bulletin #3810470-01. Ensure your torque wrench and torque-angle meter are
The most common mistake when using new torque specs on an ISX is .
| Component | Fastener Type | Torque Procedure | | :--- | :--- | :--- | | (Engine SN up to 7,901,2120, "USA" block) | Mains | 110 ft-lbs + 180° (Torque-to-Yield) | | Main Bearing Cap Bolts (Engine SN after 7,901,2120, "MEX" block) | Mains | 300 ft-lbs + 90° (Torque-to-Yield) | | Connecting Rod Bolts (USED) | Used Rod Bolt | 52 ft-lbs + 60° | | Connecting Rod Bolts (NEW) | New Rod Bolt | 30 ft-lbs → LOOSEN → 52 ft-lbs + 60° | Rotate the capscrews an additional 60 degrees
The connecting rods in a Cummins ISX experience intense alternating tensile and compressive loads. Achieving the exact bolt stretch is non-negotiable for engine longevity. Standard Rod Bolt Torque Sequence
Re-tighten all main cap bolts to 150 N·m [111 lb-ft] .
Torquing the main and connecting rod bearings on a Cummins ISX is a critical step that requires careful attention to detail, the correct procedure, and the right tooling. Using a used-bolt procedure on new bolts, or failing to identify whether you have a "USA" or "MEX" block for the mains, can lead to catastrophic failure after rebuild.
