SEAL-O-RING 4L8337 - Caterpillar

Refer to Specifications, "Crankshaft" for information on the undersize crankshaft journals. The original size of the connecting rod bearing journal ... 63.47 to 63.49 mm (2.4988 to 2.4996 inch)Maximum permissible wear of a bearing journal on a new connecting rod ... 0.04 mm (0.0016 inch)Width of the connecting rod bearing journals ... 40.348 to 40.424 mm (1.5885 to 1.5915 inch)Radius of the fillet of the connecting rod bearing journals ... 3.68 to 3.93 mm (0.14488 to 0.15472 inch)Surface finish of connecting rod bearing journals ... Ra 0.4 microns (16 µ inch)Surface finish of radii ... Ra 1.3 microns 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 2.
Second undersize - 0.508 mm (0.020 inch). For connecting rod bearing shells, refer to Table 3.
Third undersize - 0.762 mm (0.030 inch). For connecting rod bearing shells, refer to Table 4.The Shell for the Connecting Rod Bearings
Standard Bearing Shells
Table 1
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 to 31.88 mm (1.244 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 2
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 3
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 4
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)