KIT-COVER 4372893 - Caterpillar

Piston Pin Bearings
Note: This procedure requires personnel with the correct training and the use of specialized equipment for machining.If the piston pin bearing requires replacement but the original connecting rod is not replaced, the following procedures must be performed:
Determine the grade of length of the connecting rod. Use one of the following characteristics:
The mark
The color
Measuring the length
Remove the piston pin bearing from the connecting rod. Install a new bearing in the connecting rod. The new bearing is partially finished. The new bearing must be bored off-center to the correct diameter. This off-center position is determined by the grade of length of the connecting rod. Refer to table 1. The correct diameter of the bore in the piston pin bearing is given in Specifications, "Connecting Rod".Surface finish of the bored hole in the piston pin bearing ... Ra 0.8 micrometers
Machine the ends of the piston pin bearing to the correct length. Remove any sharp edges. Refer to Specifications, "Connecting Rod".Table 1 references the following information: Grade of letter of the connecting rod, the color code of the connecting rod and the length of the connecting rod.
Table 1
Length Grades for Connecting Rods
Grade Letter Color Code Length Of The Connecting Rod (CRL)
B Blue 163.081 to 163.114 mm (6.42050 to 6.42180 inch)