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REPAIR INSTRUCTIONS, PART 3
4. If clearance is not within specification, adjust
the clearance as required, using shims
(Figure 426) placed on top of the valve yoke
(bridge).
a. Remove the shim retaining screw and
remove the shim(s).
b. Determine the thickness of the shim(s)
required to match the measured
clearance.
c. Make sure that the valve yoke and
shim(s) are clean. Place the shim(s) in
position on the valve yoke.
Do NOT use more than two shims. Shims are
available (shim kit No. 85111158) in 0.05 mm
(0.002 inch) increments with the thickness
marked on the surface. If two shims are required
to take up the clearance, the shims should be of
nearly equal thickness.
426
Figure 426 — Engine Compression Brake Adjustment
Shim
5. With the required shim(s) in place, install the
retainer screw securing the shim(s) to the
valve yoke and tighten according to
specification. Hold the yoke securely while
tightening the retaining screw to avoid
bending the valve stems.
6. Recheck the clearance between the exhaust
valve rocker arm and the valve yoke.
Mark the respective rocker arm as each valve
adjustment is completed.
CONTINUATION OF ADJUSTMENTS
Continue the procedure by turning the engine to
the appropriate timing marks and adjusting the
valves and unit injectors at each of the remaining
cylinders. Follow the steps previously described
to adjust the inlet and exhaust valves, and unit
injector at each cylinder.
OPERATIONAL CHECK
After the valve and unit injector adjustments have
been completed, check engine operation as
follows:
1. Using the flywheel turning tool, 9996956,
turn the engine over manually two complete
revolutions to ensure that no piston-to-valve
contact occurs. If contact does occur,
readjust the valves as needed BEFORE
starting the engine.
2. Start the engine and bring it up to normal
operating temperature.
3. Once normal operating temperature is
attained, let the engine idle for an additional
five minutes. During this time, the EECU will
perform its own cylinder balancing, resulting
in smooth engine idling.
Do NOT use any form of power consuming
equipment, such as PTO or air conditioning,
when cylinder balancing is being carried out.
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