Page 184
REPAIR INSTRUCTIONS, PART 1
Rocker Arm Shaft Disassembly
Removing the rocker arm shaft from the engine is
covered in “Rocker Arm Shaft and Engine Brake
Removal” on page 114.
WITH ENGINE BRAKE
On engines fitted with the engine brake, the
exhaust rocker arms contain pistons which must
remain with the arms in which they have been
operating. Use rubber bands or tie straps to hold
the pistons in place during disassembly. Failure to
heed this caution may result in severe engine
damage.
241
Figure 241 — Tie Strap Holding Engine Brake Piston
WITH OR WITHOUT ENGINE BRAKE
Disassemble the rocker arm shaft and
components as follows.
1. Mark the rocker arms and yokes so they can
be put back in their original locations.
2. Slide the rocker arms off the shaft.
3. Remove and separate the adjusting screws
and jam nuts and set them aside.
A rocker arm and its yoke must be kept together.
They are marked in sets.
Inspection
ALL COMPONENTS
1. Inspect all components of the rocker arm
shaft assembly for damage and excessive
wear. If a roller does not move or binds,
replace the rocker arm.
2. Check the valve and piston action on the
exhaust rocker arms for any signs of binding.
Replace as necessary.
3. Inspect the rocker arm shaft for galling,
scoring or excessive wear. Replace as
necessary.
Rocker Arm Shaft Assembly
WITH OR WITHOUT ENGINE BRAKE
Assemble the rocker arm shaft and components
as follows:
1. Lubricate the adjusting screws and jam nuts.
2. Thread the adjusting screws and jam nuts
loosely into the rocker arms.
3. Arrange the rocker arms in sets of three
according to the markings made at
disassembly.
4. Lubricate the rocker arm shaft and the bores
of the rocker arms.
5. Slide the rocker arm sets onto the shaft
according to the markings made at
disassembly.
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