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ENGINE: HEAD· VALVES· GUIDES - SPRINGS AND ROCKERS
61
ROCKERS
Inspection.
Check the surface of rocker shaft and the oil
holes in rockers and supports for the evidence of
scores or seizure.
If
so, renew parts affected.
Check the rocker face contacting the valve and
the ball seat of rocker contacting the push rod for
a nUIror-like condition.
The
fitting
clearance of rocker shaft
in
rocker
opening should be .0004" to .0017"
(OmO
to 0.042
mm), while the clearance specification between
rocker shaft and support
is
.0004" to .0016" (0.010
to 0.040 rom).
Wear limit: .006" (0.15 rom).
If
on inspection clearance turns out to exceed
above figures. replace the item more worn, or both.
NOTE· Rocker shaft support nuts must be drawn
up wilh 1•.5 ft.lbs (2 kgm) of torque.
Checking Springs.
Check rocker springs for cracks or weakness.
Use spring tester Ap. 5049: under a load of
4.8±.33 lbs (2.2±0.15 kg) spring length should
be .984" (25 rom).
Fig. 108 - Rocker, shaft and support assembly.
A. Intake valve rockers. - S. Exhaust valve rockers.
See page 67 for inspection of valve tappet
clearance.
NOTE· On assembly, recall that exhaust valve
rockers are different from those of intake valves.
Rockers must be positioned as shown in fig. 108.
Kg 2.9
:!: D,l
Fig. 109 • Rocker .prlng checking data.
-~------------~---~-- ~ ~ ~
o
o
o
o
Fig. 110 - Critical dimension. (metric) of rocker., .haft and .upports.
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