PISTON 1869177 - Caterpillar

Do not disassemble the Variable Valve Actuator. There are no components of the Variable Valve Actuator that are serviceable. If the Variable Valve Actuator is disassembled, the warranty will be void.
Illustration 1 g01427660
Top view of engine
Illustration 2 g01431042
Tightening sequence for the rocker arm shaft
Right side view
Use the following procedure to tighten the nine studs (1):
Tighten the studs in the numerical sequence that is shown in Illustration 2 to 50 5 N m (37 4 lb ft).
Turn the studs to an additional 45 5 degrees.
Illustration 3 g01431037
Tightening sequence for the rocker arm shaft
Left side view
Use the following procedure to tighten the nine studs (2):
Tighten the studs in the numerical sequence that is shown in Illustration 3 to 50 5 N m (37 4 lb ft).
Turn the studs to an additional 45 5 degrees.
Illustration 4 g01427680
Right side view of engine
Illustration 5 g01428104
Left side view of engine
(6) Torque for six taperlock studs ... 65 10 N m (48 7 lb ft)
Illustration 6 g01428087
Right side view of engine
Tightening sequence for the valve actuator group
Illustration 7 g01436074
Left side view of engine
Tightening sequence for the valve actuator group
Use the following procedure to tighten the valve actuator group:
In order to install the valve actuator group for the compression brake to the cylinder head, place the housing over the mounting studs. Finger tighten the mounting stud nuts and the mounting bolt.
Tighten the nuts, the bolt and flange nuts of each valve actuator group in the sequence 9, 12, 8, 10, 7, 13, 11, 9 to standard torque. Refer to Illustration 6 and Illustration 7.
Again tighten the nuts, the bolt and flange nuts of each valve actuator group in the sequence 9, 12, 8, 10, 7, 13, 11, 9 to standard torque.
Illustration 8 g01427354
Typical example
Note: The lash setting for the exhaust valve to rocker arm must be completed before the lash setting of the compression brake. Refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust" for procedural information. (14) Lash setting for compression brake ... 0.76 0.08 mm (0.030 0.003 inch) (15) Torque for locknut ... 15 3 N m (11 2 lb ft)Reference: Refer to Testing and Adjusting, "Compression Brake Lash - Adjust" for procedural information that is related to the adjustment of the compression brake.