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EM–44
(3) Check of valve spring edge surface for levelness
q Apply a load of 49 N to the valve spring on a
spring tester.
w Under the condition q above, insert a thickness
gauge at the arrowheaded point "A" at the right fig-
ure.
Here, the thickness gauge should measure 0.07
mm in thickness and 12.5 mm in width. Ensure that
the tip-end of the thickness gauge will not reach
the center of the coil spring.
If the tip-end of the thickness gauge reaches the
center of the coil spring, replace the coil spring
with a new part.
18. Inspection of valve rocker arms and valve rocker shaft
(1) Visually inspect the valve rocker arm for cracks,
seizure or wear.
Replace the valve rocker arm, if necessary.
(2) If the valve rocker arm-to-cam contact surface is worn
excessively, replace the rocker arm.
(3) Visually inspect the valve rocker shaft for cracks,
seizure or wear.
Replace the valve rocker shaft, if necessary.
(4) Valve rocker shaft-to-valve rocker arm
•
Using a dial gauge, measure the inner diameter of
the valve rocker arm in two directions, 90 degrees
apart from each other.
•
Using a micrometer, measure the outer diameter of
the valve rocker arm attaching position of the valve
rocker shaft in two directions, 90 degrees apart
from each other.
•
Calculate the oil clearance by subtracting the rock-
er shaft diameter from the rocker arm diameter.
Oil Clearance
Specified Value:
Allowable Limit:
NOTE:
•
The measurement of the rocker shaft outer diameter
must be performed at the assembling position of each
rocker shaft.
0.012 - 0.053 mm
0.08 mm
49 N
A
JEM00172-00157
Roughness
JEM00173-00158
IN
EX
JEM00174-00159
JEM00175-00160
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