Chery A21 2005 Service Manual page 38

4) Check the diameter of value stem
a: Use micrometer caliper to measure the
diameter of valve stem.
Valve
Guide
Inner Diameter Of
Valve Guide
B: Use inner micrometer guage to measure
the inner diameter of valve guide.
C: Calculate the difference of measured
value and the clearance.
If they exceed the specified limit values, the
value or guide shall be replaced more
necessarily.
D: Check the contact bandwidth of valve.
E: Check the valve seat insert.
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Outer Diameter
Of Valve Stem
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Measuring Point
Contact Position (Should Be
At The Center Of Slope.)
29
Measuring Point
Edge
Thickness