C4.4 Engines for Caterpillar Built Machines Caterpillar

Maximum permissible wear of the main bearing journals ... 0.040 mm (0.0016 inch)

Surface finish of bearing journals, crank pins, and radii ... Ra 0.0025 microns (10 µ inch)

The Shell for the Main Bearings

Standard Bearing Shells

Thickness at center of the shells ... 2.083 to 2.089 mm (0.0820 to 0.0823 inch)

Width of the main bearing shells ... 31.62 to 31.88 mm (1.244 to 1.255 inch)

Clearance between the bearing shell and the main bearing journals ... 0.057 to 0.117 mm (0.0022 to 0.0046 inch)