SEAL-O-RING 8T1919 - Caterpillar

Refer to the Specifications module, "Crankshaft" topic for information on the undersize main bearing journals, and information on the width of main bearing journals.
Table 1
Item Quantity Part Specification Description
- All The original size of the main bearing journal 76.159 mm to 76.180 mm (2.9984 inch to 2.9992 inch)
- All Maximum permissible wear of the main bearing journals 0.040 mm (0.0016 inch)
- All Radius of the fillet of the main bearing journals 3.68 mm (0.1449 inch) to 3.89 mm (0.1531 inch)
- All Surface finish of bearing journals, crank pins, and radii 0.4 microns (16 µ inches) Main bearing journals can be machined by the following amounts:
First undersize - 0.254 mm (0.010 inch). For main bearing shells, refer to Table 3.
Second undersize - 0.508 mm (0.020 inch). For main bearing shells, refer to Table 4.
Third undersize - 0.762 mm (0.030 inch). For main bearing shells, refer to Table 5.The Shell for the Main Bearings
Standard Bearing Shells
Table 2
Item Quantity Part Specification Description
- All Thickness at center of the shells 2.083 mm to 2.089 mm (0.0820 inch to 0.0823 inch)
- All Width of the main bearing shells 31.62 mm to 31.88 mm (1.244 inch to 1.255 inch)
- All Clearance between the bearing shell and the main bearing journals 0.057 mm to 0.117 mm (0.0022 inch to 0.0046 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 2.210 mm (0.0870 inch) to 2.216 mm (0.0872 inch)
- All Width of the main bearing shells 31.62 mm (1.2449 inch) to 31.88 mm (1.2551 inch)
- All Clearance between the bearing shell and the main bearing journals 0.058 mm (0.0023 inch) to 0.117 mm (0.0046 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 2.337 mm (0.0920 inch) to 2.343 mm (0.0922 inch)
- All Width of the main bearing shells 31.62 mm (1.2449 inch) to 31.88 mm (1.2551 inch)
- All Clearance between the bearing shell and the main bearing journals 0.058 mm (0.0023 inch) to 0.117 mm (0.0046 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 2.404 mm (0.0946 inch) to 2.470 mm (0.0972 inch)
- All Width of the main bearing shells 31.62 mm (1.2449 inch) to 31.88 mm (1.2551 inch)
- All Clearance between the bearing shell and the main bearing journals 0.058 mm (0.0023 inch) to 0.117 mm (0.0046 inch)