NUT 6V8149 - Caterpillar

Refer to the Specifications Module, "Crankshaft" topic for information on the undersize crankshaft journals.
Table 1
Item Quantity Part Specification Description
- - The original size of the connecting rod bearing journal 63.47 mm to 63.49 mm (2.4988 inch to 2.4996 inch)
- - Maximum permissible wear of the connecting rod bearing journals 0.04 mm (0.0016 inch)
- - Width of the connecting rod bearing journals 40.35 mm to 40.42 mm (1.589 inch to 1.591 inch)
- - Radius of the fillet of the connecting rod bearing journals 3.68 mm (0.1449 inch) to 3.93 mm (0.1547 inch)
- - Surface finish of connecting rod bearing journals and radii Ra 0.4 microns (16 µ inch) Connecting rod bearing journals can be machined by the following amounts:
First undersize - 0.254 mm (0.010 inch). For connecting rod bearing shells, refer to Table 3.
Second undersize - 0.508 mm (0.020 inch). For connecting rod bearing shells, refer to Table 4.
Third undersize - 0.762 mm (0.030 inch). For connecting rod bearing shells, refer to Table 5.The Shell for the Connecting Rod Bearings
Standard Bearing Shells
Table 2
Item Quantity Part Specification Description
- All Thickness at center of the shells 1.835 mm (0.0722 inch) to 1.841 mm (0.0725 inch)
- All Width of the connecting rod bearing shells 31.62 mm to 31.88 mm (1.244 inch to 1.255 inch)
- All Clearance between the bearing shell and the connecting rod bearing journals 0.034 mm (0.0013 inch) to 0.081 mm (0.0032 inch) First Undersize Bearing Shells
Table 3
Item Quantity Part Specification Description
- All First undersize bearing shell 0.254 mm (0.010 inch)
- All Thickness at center of the shells 1.962 mm (0.0772 inch) to 1.968 mm (0.0775 inch)
- All Width of the connecting rod bearing shells 31.62 mm (1.2449 inch) to 31.88 mm (1.2551 inch)
- All Clearance between the bearing shell and the connecting rod bearing journals 0.034 mm (0.0013 inch) to 0.081 mm (0.0032 inch) Second Undersize Bearing Shells
Table 4
Item Quantity Part Specification Description
- All Second undersize bearing shell 0.508 mm (0.020 inch)
- All Thickness at center of the shells 2.089 mm (0.0822 inch) to 2.095 mm (0.0825 inch)
- All Width of the connecting rod bearing shells 31.62 mm (1.2449 inch) to 31.88 mm (1.2551 inch)
- All Clearance between the bearing shell and the connecting rod bearing journals 0.034 mm (0.0013 inch) to 0.081 mm (0.0032 inch) Third Undersize Bearing Shells
Table 5
Item Quantity Part Specification Description
- All Third undersize bearing shell 0.762 mm (0.030 inch)
- All Thickness at center of the shells 2.216 mm (0.0872 inch) to 2.222 mm (0.0875 inch)
- All Width of the connecting rod bearing shells 31.62 mm (1.2449 inch) to 31.88 mm (1.2551 inch)
- All Clearance between the bearing shell and the connecting rod bearing journals 0.034 mm (0.0013 inch) to 0.081 mm (0.0032 inch)