Cummins Isx Main And Rod Bearings Torque Specs New Patched Jun 2026

Out-of-round main bores cause the crankshaft to flex. That kills the thrust bearing in 200 hours.

Torquing the main and rod bearings on a Cummins ISX build is not guesswork—it is a science. The difference between a rebuild that runs for 500,000 miles and one that spins a bearing in 500 miles is usually an angle gauge and patience. cummins isx main and rod bearings torque specs new

With new bearings and a standard crank:

Main bearing capscrews follow a different pattern and require lubrication with clean engine oil before installation. Initial Seating (Thrust Bearing): Out-of-round main bores cause the crankshaft to flex

Without loosening, tighten each vertical bolt an additional 90 degrees (1/4 turn) . cummins isx main and rod bearings torque specs new