Chery A21 - Page 21

CHERY A21 SERVICE MANUAL MECHANISM OF 2.0NALC ENGINE
21
b: Use internal micrometer guage to
measure the internal diameter of valve
guide and the measuring point is a
quartering point of guide.
c: Calculate the difference of measured
value and the clearance.
Replace the valve or the guide if the value
exceeds the limit value.
d: Examine the contact bandwidth of
valve.
e: Check the valve seat insert.
Standard
Value
IN
￠5.98±0.008
Outer Diameter
of Valve stem
(mm)
EX
￠5.96±0.008
IN
￠5.4±0.1 Inner Diameter
of Valve guide
(mm)
EX
￠5.4±0.1
IN
0.02 Clearance
(mm)
EX
0.04
IN
0.3±0.15
Thickness of
Valve Top
（mm）
EX
0.3±0.15
IN
1.158 Seal Bandwidth
（mm）
EX
1.306
Measuring Point
Contact Position (Should be
the Center of Slope)
Edge
Thickness
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