TERMINAL 0018199 - Caterpillar

Replace Only the Piston or the Bearing for the Piston Pin
This procedure is applicable when the original connecting rod is used with the following components: piston and piston pin bearing.
Remove the bearing for the piston pin, which was installed in the factory, from the connecting rod. Install a new bushing in the connecting rod. If necessary, ream the new bearing in order to obtain the correct clearance between the piston pin and the bearing.Refer to Specifications, "Piston and Rings" for dimensions of bearings and piston pins.
Install a new piston, if necessary. The new piston will be the "Std" height grade. Also, a new piston pin may be required.Refer to Specifications, "Piston and Rings" for specifications of pistons and piston rings.
Measure the height of the piston above the cylinder block in order to ensure the correct piston height.Bending and Twisting of the Connecting Rod
Illustration 1 g01367158
Measure distance (A) .
Measure distance (B) .
Use the following equation: A / B < (0.05) (0.002) / (100) (3.9). If the limit is exceeded, replace the connecting rod.Inspect the Bearing and Piston Pin for Wear
Note: The bolts on the connecting rod are installed in the connecting rod by a special process. The bolts should not be rotated or removed. If the bolts are rotated or removed, the connecting rod and the bolts will be damaged.
Inspect the bearing for the piston pin and the piston pin for wear.
Measure the clearance of the piston pin in the bearing for the piston pin. Refer to Specifications, "Connecting Rod" for dimensions.If the bearing or the piston pin are not within tolerances, the component must be replaced. If the clearance between the bearing and piston pin is not within the tolerance, one or both components must be replaced.