C15 On-highway Engine Caterpillar

Refer to Specifications, "Variable Valve Actuator" for information that is related to the adjustment of the variable valve actuator.

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NOTICE
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	g01100789
Tightening sequence for the valve actuator group

Use the following procedure to tighten the valve actuator group:

1. 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.

2. Tighten the nuts, the bolt and flange nuts of each valve actuator group in the numerical sequence that is shown in Illustration 1.

3. Again, tighten the nuts, the bolt and flange nuts of each valve actuator group in the numerical sequence that is shown in Illustration 1.

Illustration 2	g01641694
Right side view of engine

(1) Torque for the taperlock studs ... 65 ± 10 N·m (48 ± 7 lb ft)

Illustration 3	g01675243
Left side view of engine

Use the following procedure to tighten the nine studs (2):

1. Tighten the studs in the numerical sequence that is shown in Illustration 3 to 50 ± 5 N·m (37 ± 4 lb ft).

2. Turn the studs to an additional 45 ± 5 degrees.

Illustration 4	g01641016

(3) Lash setting for CAT Compression Brake ... 0.686 ± 0.050 mm (0.0270 ± 0.0020 inch)

(4) Torque for the locknut ... 15 ± 3 N·m (11 ± 2 lb ft)

Reference: Refer to Testing and Adjusting, "CAT Compression Brake Lash - Adjust" for procedural information that is related to the adjustment of the CAT Compression Brake.