Page 448
REPAIR INSTRUCTIONS, PART 3
549
Figure 549 — Tightening Adjusting Screw Jam Nut
6. Remove the thickness gauge.
7. Check the exhaust valve lash adjustments
by pushing down on the adjusting screw end
of the rocker arm to compress the push rod
spring and inserting the appropriate
thickness gauge (inlet — 0.016 inch
[0.406 mm]; exhaust — 0.024 inch
[0.610 mm]) between the rocker arm slipper
face and the valve yoke. Continue exerting
downward pressure on the rocker arm to
keep the push rod spring compressed while
checking the adjustment. The thickness
gauge should be snug between the slipper
face and valve yoke. If not, repeat the
adjustment procedure. Inlet valve lash
adjustment may be checked in the same
manner, except there is no push rod spring
to compress.
When exerting pressure on the rocker arm to
keep the push rod spring compressed, drag on
the thickness gauge should feel normal, as when
performing an adjustment on an engine that is not
equipped with spring-loaded push rods. When
hand-pressure is released, a significant increase
in drag on the thickness gauge will be felt due to
the force of the push rod spring.
550
Figure 550 — Checking Valve Lash Adjustment
1. Rocker Arm 2. Feeler Gauge
5-111.bk Page 448 Monday, July 10, 2006 2:26 PM
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