REPAIR INSTRUCTIONS, PART 1
Page 269
298
Figure 298 — Mack PowerLeash™ Rocker Shaft Assembly
6. Lubricate the bore of the inlet rocker arm
with clean engine oil, then install the rocker
arm on the shaft. The push rod end of the
inlet rocker arm faces the long offset side of
the rocker shaft mounting bracket.
7. Lubricate a flat washer, then slide it on the
rocker shaft. Install a circlip into the groove
of the rocker shaft to secure the inlet rocker
arm in place.
8. Install a circlip in the groove of the rocker
shaft at the location for the second exhaust
rocker arm.
9. Lubricate a flat washer with clean engine oil,
then slide it onto the rocker shaft, against
the circlip.
10. Lubricate the bore of the exhaust rocker arm
with clean engine oil, then slide it on the
rocker shaft, against the flat washer.
When reinstalling PowerLeash™ exhaust rocker
arms, always check the engine brake actuator
plunger for full travel and freedom of movement
by pressing and releasing the plunger. If the
plunger binds in the bore or full travel is not
achieved, the rocker arm must be replaced.
11. Lubricate a spring washer, then slide it over
the end of the rocker shaft, against the
second exhaust rocker arm.
12. Lubricate the bore of the rocker shaft
mounting bracket, then slide it over the end
of the rocker shaft, against the wave washer.
13. Align the locating hole in the mounting
bracket with the threaded locating hole in the
rocker shaft. Lubricate the threads of the
locating bolt. Install the locating bolt and lock
washer to the mounting bracket.
Finger-tighten only at this time.
1. Retaining Ring
2. Flat Washer
3. Exhaust Rocker Arm (with Engine Brake Hydraulic
Actuator)
4. Spring Washer
5. Inlet Rocker Arm
6. Rocker Shaft Mounting Bracket (Slip Fit)
7. Mounting Bracket Locating Bolt
8. Lock Washer
5-111.bk Page 269 Monday, July 10, 2006 2:26 PM
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