Page 268
REPAIR INSTRUCTIONS, PART 1
Valve Rocker Arm Shaft
Reassembly (with MACK
PowerLeash™ Engine Brake)
ROCKER SHAFT/FRONT MOUNTING
BRACKET ASSEMBLY
The rocker shaft contains oil passages that
supply both lubricating oil and control pressure oil
to the rocker arms. As with rocker shaft
assemblies on non-brake engines, alignment of
the oil ports in the front mounting bracket with
ports in the rocker shaft is critical. The first rocker
shaft mounting bracket is a press-fit onto the
shaft, while the center and rear brackets are
slip-fit. The rocker shaft and front mounting
bracket are an assembly. The rocker shaft
assembly consists of the following parts:
297
Figure 297 — Rocker Shaft/Front Mounting Bracket
Assembly
As mentioned above, the front mounting bracket
on MACK PowerLeash™ rocker shafts is a
press-fit, and alignment of the oil passage
between the bracket and shaft is critical. A
pre-assembled rocker shaft/front mounting
bracket (part No. 466GC4111M) is available
through the MACK Parts System. DO NOT
replace the entire rocker arm and shaft assembly.
POWERLEASH™ ROCKER SHAFT
ASSEMBLY
Refer to Figure 298.
1. Lubricate a spring washer with clean engine
oil, then slide it on the front end of the rocker
shaft.
2. Lubricate the bore of the exhaust rocker arm
with clean engine oil.
3. Install the exhaust rocker onto the front of
the rocker shaft. The push rod end of the
rocker faces the large offset end of the
rocker shaft mounting bracket.
4. Lubricate a flat washer with clean engine oil,
then slide it on the front end of the rocker
shaft. Install a retaining ring in the groove at
the end of the rocker shaft to secure the
rocker arm in place.
5. Lubricate a spring washer with clean engine
oil, then slide it onto the opposite end of the
rocker shaft and position it against the
mounting bracket.
1. Rocker Shaft
2. Rocker Shaft Mounting
Bracket (Press Fit)
3. Mounting Bracket
Locating Bolt
4. Lock Washer
5-111.bk Page 268 Monday, July 10, 2006 2:26 PM
To Next Page
Loading...
