GEAR-RING 1719387 - Caterpillar

Refer to Specifications, "Crankshaft" for information on the undersize main bearing journals, and information on the width of main bearing journals.The original size of the main bearing journal ... 76.159 to 76.180 mm (2.9984 to 2.9992 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 to 3.89 mm (0.1449 to 0.1532 inch)Surface finish of bearing journals and crank pins ... 0.4 microns (16 µ inches)Surface finish of radii ... 1.3 micronsWidth of new main bearing journal ... 39.34 to 39.24 mm (1.5488 to 1.5449 inch)Width of new center main bearing journal ... 44.22 to 44.15 mm (1.7409 to 1.7382 inch)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 2.
Second undersize - 0.508 mm (0.020 inch). For main bearing shells, refer to Table 3.
Third undersize - 0.762 mm (0.030 inch). For main bearing shells, refer to Table 4.The Shell for the Main Bearings
Standard Bearing Shells
Table 1
Item Quantity Part Specification Description
- All Thickness at center of the shells 2.083 to 2.089 mm (0.0820 to 0.0823 inch)
- All Width of the main bearing shells 31.62 to 31.88 mm (1.244 to 1.255 inch)
- All Clearance between the bearing shell and the main bearing journals 0.057 to 0.117 mm (0.0022 to 0.0046 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 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 3
Item Quantity Part Specification Description
- All Second undersize bearing shell 0.508 mm (0.020 inch)
- All Thickness at center of the shells 2.337 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 4
Item Quantity Part Specification Description
- All Third undersize bearing shell 0.762 mm (0.030 inch)
- All Thickness at center of the shells 2.404 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)