Cummins Isx Main And Rod Bearings Torque Specs New !!better!! May 2026

Here are the torque specifications for Cummins ISX (common models: ISX15, ISX12, Signature, and related CM870, CM871, CM2250, CM2350) main and connecting rod bearings using new fasteners.

Part 4: The "Plastigage" Mandate (Clearance Verification)

Torque specs alone do not guarantee a successful rebuild. You must verify oil clearance using Plastigage or a bore gauge. cummins isx main and rod bearings torque specs new

Part 2: The "Deep" Engineering – Why Torque Wrenks Lie

If you hand a novice a torque wrench set to 140 ft-lbs for the rod bolt stage 2, they will stop. They are wrong. Here are the torque specifications for Cummins ISX

  1. Clean the crankshaft journal and bearing shells completely (oil inhibits Plastigage accuracy).
  2. Place a strand of Plastigage across the width of the bearing shell (in the cap).
  3. Install the cap and torque to specification exactly as listed above.
  4. Do not rotate the crankshaft.
  5. Remove the cap and measure the smashed width of the Plastigage against the scale on the packaging.

How to Plastigage:

Ensure the "tang" of the bearing shell is properly seated in the notch. 🏎️ Connecting Rod Bearing Torque Specs Clean the crankshaft journal and bearing shells completely