C4.4 Engines for Caterpillar Built Machines Caterpillar


Main Bearing Journal - Spheroidal Graphite Iron (SGI) Crankshaft

Usage:

CB-54B 463
Refer to the Specifications module, "Crankshaft" topic for 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 to 76.180 mm (2.9984 to 2.9992 inch) 
All  Maximum permissible wear of the main bearing journals  0.040 mm (0.0016 inch) 
All  Surface finish of bearing journals, crank pins, and radii   Ra 0.0025 microns (10 µ inch)  

The Shell for the Main Bearings

Bearing Shells

Table 2
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) 

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