Rocker-Arm Shaft and Rocker Arms
0
Shaft-to-arm clearance (IN & EX):
Using a micrometer and a bore gauge, measure
The difference between two readings is the
specified.
If the limit is exceeded, replace shaft or arm,
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Item
Standard Limi t
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Rocker arm 16.000
-
16.018 mm
I.D. (0.629
-
0.630 in.)
Rocker arm 15.973
-
15.988 mm
Shaft dia. (0.628
-
0.629 in.)
Arm-to-Shaft 0.012
-
0.045 mm 0.08 mm
clearance (0.0005
-
0.0017 in.) (0.0035 in.)
Fig. 3-5-6
l Runout of rocker-arm shaft:
Using
“V”
blocks and dial gauge, check
runout. If
runout
exceeds the limit, replace
rocker arm shaft.
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Runout limit
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1
0.12 mm (0.004 in.)
1
I
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Fig. 3-5-7
0
Wear of rocker-arm and adjusting screw:
If the tip
@
of adjusting screw is badly worn,
replace screw. Arm must be replaced if its
cam-riding face
@I
is badly worn.
1.
Adjusting screw
2. Rocker arm
3. Cam-riding face
Fig. 3-5-8
Valve Guides
Using a micrometer and bore gauge, take dia-
meter readings on valve stems and guides to
determine stem clearance in guide. Be sure to
take a reading at more than one place along
the length of each stem and guide.
3-19