C3.3 Industrial Engine Caterpillar

The original size of the main bearing journal ... 76.159 mm to 76.180 mm (2.998 inch to 2.999 inch)

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

Radius of the fillet of the main bearing journals ... 3.68 mm to 3.69 mm (0.1448 inch to 0.1452 inch)

Surface finish of bearing journals, crank pins, and radii ... 0.4 microns (16 µ inches)

The shell for the main bearings

The shells for the main bearings are available for remachined journals which have the following undersize dimensions.

Undersize bearing shell ... 0.25 mm (0.010 inch)

Undersize bearing shell ... 0.51 mm (0.020 inch)

Undersize bearing shell ... 0.75 mm (0.030 inch)

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 ... 0.057 mm to 0.117 mm (0.002 inch to 0.005 inch)