REPAIR INSTRUCTIONS, PART 3
Page 289
EXHAUST VALVE ADJUSTMENT (WITHOUT
POWERLEASH™)
1. At the current camshaft setting, adjust the
exhaust valves following the same
procedure described for adjustment of the
inlet valves. However, the valve clearance
specification is different, at 0.80 ±0.05 mm
(0.031 ±0.002 inch).
2. Using the flywheel turning tool, 9996956,
turn the engine over manually to the
appropriate marking for the next cylinder.
Adjust the inlet valves, unit injector and
exhaust valves at that cylinder.
EXHAUST VALVE ADJUSTMENT (WITH
POWERLEASH™)
The numbers used to adjust the exhaust valves
are preceded by a V in front of the number on the
camshaft.
1. Using the flywheel turning tool, 9996956,
turn the engine over so that the appropriate
V number marking for the respective exhaust
valve is between the lines on the camshaft
bearing cap.
2. Press down on the rocker arm as shown in
Figure 424. If the rocker arm “springs,” the
brake piston spring should be pulled outward
at the same time as the rocker arm is
pressed down to make and ensure contact
with the valve stem. Use a strong wire with a
hooked end to catch and compress the
spring. When the piston spring is loosened
from its seat, the residual oil film retaining
the spring is punctured, allowing the
adjustment setting to be more accurate.
When the piston spring is loosened from its seat,
the valve allows trapped oil to be released from
above the plunger.
Use care to avoid damaging the sliding surface
within the piston and make sure that the wire or
other suitable tool used to catch and compress
the spring is thoroughly cleaned before use. Any
dirt or impurities between the rocker arm piston
and rocker arm or other damage can cause
piston seizure and malfunctioning engine brake.
424
Figure 424 — Releasing Engine Brake Piston Pressure
3. Measure the clearance between the rocker
arm piston and the shim on top of the yoke
(bridge) as shown in Figure 425. The
clearance should be 2.0 ±0.05 mm
(0.079 ±0.002 inch).
425
Figure 425 — Measuring Exhaust Valve Clearance
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