C4.4 Industrial Engine Caterpillar

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

Surface finish of bearing journals and crank pins ... Ra 0.25 microns

Width of new main bearing journal where the thrust washer is installed ... 39.765 to 39.835 mm (1.56555 to 1.56830 inch)

Width of new main bearing journal where the thrust washer is not installed ... 39.19 to 39.39 mm (1.54291 to 1.55078 inch)

The shell for the main bearings

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

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

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

Oversize bearing shell ... 0.76 mm (0.030 inch)

Thickness at center of the shells of oversize bearing shell 0.25 mm (0.010 inch) ... 2.226 to 2.232 mm (0.08764 to 0.08787 inch)

Thickness at center of the shells of oversize bearing shell 0.50 mm (0.020 inch) ... 2.353 to 2.359 mm (0.09264 to 0.09287 inch)

Thickness at center of the shells of oversize bearing shell 0.76 mm (0.030 inch) ... 2.480 to 2.486 mm (0.09764 to 0.09787 inch)

Width of the main bearing shells ... 26.32 to 26.58 mm (1.03622 to 1.04645 inch)

Clearance between the bearing shell and the main bearing journals ... 0.036 to 0.094 mm (0.00142 to 0.00370 inch)