KIT-SEAL 8R2972 - Caterpillar

Table 1
Diameter of Main Bearing Journals    
Original Size Journals for four cylinder engines    
76.16 to 76.18 mm (2.998 to 2.999 inch)    
Original Size Journals for the six cylinder engines    
76.159 to 76.190 mm (2.9984 to 2.9996 inch)    
Undersize Journals
0.25 mm (0.010 inch)    
75.905 to 75.926 mm (2.9884 to 2.9892 inch)    
Undersize Journals
0.51 mm (0.020 inch)    
75.651 to 75.672 mm (2.9784 to 2.9792 inch)    
Undersize Journals
0.76 mm (0.030 inch)    
75.397 to 75.418 mm (2.9684 to 2.9692 inch)    Maximum permissible wear of the main bearing journals ... 0.04 mm (0.0016 inch)Width of the front main bearing journal ... 36.93 to 37.69 mm (1.454 to 1.484 inch)Maximum width of the front main bearing journal (Undersize journal) ... 37.82 mm (1.489 inch)Width of the center main bearing journal ... 44.15 to 44.22 mm (1.738 to 1.741 inch)Maximum width of the center main bearing journal (Undersize journal) ... 44.68 mm (1.759 inch)Width of the other main bearing journals ... 39.24 to 39.35 mm (1.545 to 1.549 inch)Maximum width of the other main bearing journals (Undersize journals) ... 39.47 mm (1.554 inch)Radius of the fillet of the main bearing journals ... 3.68 to 3.96 mm (0.145 to 0.156 inch)Surface finish of main bearing journals ... Ra 0.4 micronsMain Bearings
Main bearings are available for remachined crankshaft journals which have the following undersize dimensions. Undersize main bearing ... 0.25 mm (0.010 inch) Undersize main bearing ... 0.51 mm (0.020 inch) Undersize main bearing ... 0.76 mm (0.030 inch)Shell thickness at center for all main bearings ... 2.083 to 2.089 mm (0.0820 to 0.0823 inch)Width of the bearing Center bearing for the four cylinder engine ... 36.32 to 36.70 mm (1.430 to 1.445 inch) All other bearings for the four cylinder engine ... 31.62 to 31.88 mm (1.245 to 1.255 inch) Center bearing for the six cylinder engine ... 36.32 to 36.70 mm (1.430 to 1.445 inch) All other bearings for the six cylinder engine ... 30.86 to 31.12 mm (1.215 to 1.225 inch)Clearance between the main bearing and the main bearing journals for the four cylinder engine ... 0.057 to 0.117 mm (0.0022 to 0.0046 inch)Clearance between the main bearing and the main bearing journals for the six cylinder engine ... 0.047 to 0.117 mm (0.0018 to 0.0046 inch)