C3.3 Industrial Engine Caterpillar

Maximum permissible wear of the main bearing journals ... 0.040 mm (0.002 inch)

Surface finish of bearing journals, crank pins, and radii ... Ra 0.25 µ m (10 µ inch)

The Shell for the Main Bearings

Standard Bearing Shells

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

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

Clearance between the bearing shell and the main bearing journals ... 0.058 mm to 0.117 mm (0.002 inch to 0.005 inch)