Page 262
REPAIR INSTRUCTIONS
INSTALLATION (NON-BRAKE EQUIPPED
ENGINES)
1. Make sure the locating screw and lock
washer are in position on the rocker arm
mounting bracket for each cylinder head.
2. Make sure that all 12 push rods are properly
seated in the respective lifter sockets.
3. Position the rocker arm assemblies on the
cylinder heads.
4. Ensure that the ball end of the rocker arm
adjusting screws (inlet and exhaust) are in
position in the push rod sockets, and line up
the rocker bracket mounting holes with the
holes in the cylinder head. Be careful not to
disengage any of the push rods from the
lifters.
Make sure that adjusting screws are retracted
upward in the rocker arms. If extended far below
the rocker arm, the push rods can be bent when
tightening the rocker arm assembly brackets.
5. Lubricate the threads of the rocker arm
mounting capscrews with clean engine oil.
Install the capscrews and tighten to the
specified torque, 40 lb-ft (54 N•m), using
torque wrench J 24407, or equivalent. Refer
to Figure 290.
6. Adjust the valve lash to the specified
settings. Refer to Valve Yoke and Valve Lash
Adjustments in the ENGINE SETUP AND
ADJUSTMENTS section.
290
Figure 290 — Valve Rocker Arm Installation
INSTALLATION (J-TECH™ BRAKE-EQUIPPED
ENGINES)
Refer to Figure 291.
1. Make sure the oil supply screw is in position
on the rocker arm mounting bracket for each
cylinder head and tightened to specification,
5 lb-ft (6.8 N•m).
2. Make sure that all 12 push rods are properly
seated in the respective lifter sockets.
3. Position the rocker arm assemblies on the
cylinder heads.
4. Ensure that the ball end of the rocker arm
adjusting screws are in position in the push
rod sockets, and line up the rocker bracket
mounting holes with the holes in the cylinder
head. Be careful not to disengage any of the
push rods from the lifters.
Make sure that adjusting screws (inlet and
exhaust) are fully retracted upward in the rocker
arms. If extended far below the rocker arm, the
push rods can be bent when tightening the rocker
arm assembly brackets.
5. Loosen the three slave piston adjusting
screw jam nuts on each brake assembly and
back out the adjusting screws so that the
slave pistons are fully retracted into the
housings.
6. Carefully place each housing on the
appropriate rocker arm shaft assembly so
the oil supply screw engages the locating
hole in the brake housing.
7. Lubricate the threads of the brake housing
mounting bolts with clean engine oil and
install the bolts in the housing mounting bolt
holes. Ensure that the correct mounting
bolts are used:
Bolt P/N 416GC22M — use with housing
P/N 757GB58.
Bolt P/N 421GC314M — use with housing
P/Ns 757GB58A and 757GB58B.
1. Rocker Arm Mounting Brackets
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