MOTOR GP-PISTON 2525127 - Caterpillar

Illustration 17 g01986504
Use a 0.025 mm (0.0010 inch) feeler gauge to verify the location of the cap in the vise.Note: Make this verification on both sides of the cap.
Illustration 18 g01986533
Remove 0.08 mm (0.003 inch) to 0.13 mm (0.005 inch) from both faces. Allow the cutter to move across both faces. It is not necessary for all caps to be the same height.
Remove burrs.Repeat step 1 through step 6 for the remaining caps.Note: New replacement caps are available if machining the main caps is not the preferred method. If the caps are replaced, it is necessary to line bore the block.Procedure to Line Bore Using the 1P-4000 Line Boring Tool Group
Illustration 19 g01986634
(3) Boring Bar
(4) Centering Ring
Place centering rings in the first main bearing bore, the third main bearing bore, the fifth main bearing bore, and the seventh main bearing bore.
Remove 0.08 mm (0.003 inch) to 0.13 mm (0.005 inch) from both faces of the second main bearing cap, the fourth main bearing cap, and the sixth main bearing cap. Refer to "Procedure to Machine Main Bearing Caps" for the machining procedure.
Install the second main bearing cap, the fourth main bearing cap, and the sixth main bearing cap.
Torque all the main bearing caps to full torque. Refer to the appropriate specifications manual for the torque procedure and the tightening sequence.
Illustration 20 g01986654
The dial indicator is being used to set the size of the cutting tool.
Illustration 21 g01986656
Boring bar with cutting tool
Set the cutting tool to the appropriate size. Use the information from "Inspection" to determine the appropriate size. Refer to the corresponding specifications manual.
Apply oil to the centering rings and the boring bar. Place boring bar in centering rings. Install the cutting tool onto the boring bar.
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Hydraulic Drive
Verify that the hydraulic drive is moving in the correct direction.
Illustration 23 g01986337
Use a drill to turn the boring bar. Use a swivel joint from the 1P-4000 Line Boring Tool Group with the drill. This will help avoid mistakes.
Machine the second main bearing bore, the fourth main bearing bore, and the sixth main bearing bore. Do not move the centering rings until these bores have been completed.
Illustration 24 g06305252
The clamp (5) is holding the centering ring (4) in place.
Move the centering rings to the second main bearing bore, the fourth main bearing bore, and the sixth main bearing bore.
Remove 0.08 mm (0.003 inch) to 0.13 mm (0.005 inch) from both faces of the third main bearing cap and the fifth main bearing cap. Refer to "Procedure to Machine Main Bearing Caps" for the machining procedure.
Install the third main bearing cap and fifth main bearing cap. Torque the third main bearing cap and fifth main bearing cap to full torque. Refer to the appropriate specifications manual for the torque procedure and the tightening sequence.
Machine the third main bearing bore and the fifth main bearing bore.Note: Clamps may be necessary to keep centering rings in place.
Illustration 25 g01986748
(6) Upright Bearing Assembly
(7) Bridge Assembly
Place the bridge assembly on the block. The bridge assembly must be in front of the seventh