PISTON 4V7256 - Caterpillar

Removal Procedure
Start By:
Remove the flexible exhaust pipe from the exhaust back pressure valve. Refer to Disassembly and Assembly, "Flexible Exhaust Pipe - Remove and Install" for the correct procedure.
Illustration 1 g02476753
Unclip retaining clips (4) for exhaust back pressure valve wiring harness (3). Slide locking tab (1) into the unlocked position.
Disconnect exhaust back pressure valve wiring harness (3) from assembly of engine wiring harness (2).
Loosen allen head bolt on V-band clamp (6). Note: If the V-band clamp (6) remain tight on the flanges, apply releasing fluid on the V-band clamps in order to assist removal. Lightly tap the bolts on the V-band clamps with a soft faced hammer in order to assist removal. Do not use a prybar in order to remove V-band clamps.
Make temporary marks on exhaust back pressure valve and the exhaust elbow in order to show correct position. Remove the exhaust back pressure valve (5) from exhaust elbow (7).
Illustration 2 g02476738
Note position of dowel (8) in exhaust elbow (7). Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 4C-5597 Anti-Seize Compound 1
Ensure that the exhaust back pressure valve and the exhaust elbow are free from damage. Replace any components that are damaged.
Illustration 3 g02476738
Illustration 4 g02476753
Ensure that dowel (8) is free from damage and is correctly positioned in exhaust elbow (7).
Use Tooling (A) to lubricate the threads of the allen head bolt for V-band clamp (6).
Position V-band clamp (6) onto exhaust elbow (7).
Install exhaust back pressure valve (5) onto exhaust elbow (7). Ensure that the exhaust back pressure valve is correctly located onto dowel (8) on the exhaust elbow.
Ensure that V-band clamp (6) is seated onto exhaust back pressure valve (5) and exhaust elbow (7). Tighten the allen head bolt for the V-band clamp hand tight.
Tighten the allen head bolt for V-band clamp (6) to a torque of 12 N m (106 lb in).
Connect exhaust back pressure valve wiring harness (3) to the assembly of engine wiring harness (2).
Slide locking tab (1) into the locked position. Clip retaining clips (4) for exhaust back pressure valve wiring harness (3). End By:
Install the flexible exhaust pipe to the exhaust back pressure valve. Refer to Disassembly and Assembly, "Flexible Exhaust Pipe - Remove and Install" for the correct procedure.