Honda WB20XT2 Manual page 106

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WB20XT2•WB30XT2
Measure and record each valve guide I.D.
STANDARD: 5.500 – 5.512 mm (0.2165 – 0.2170 in)
SERVICE LIMIT: 5.572 mm (0.2194 in)
If the measured valve guide I.D. is more than the
service limit, replace the valve guide (page 12-8).
VALVE FACE/VALVE STEM O.D.
Inspect each valve face (1) for irregularities.
If necessary, replace the valve.
Inspect each valve (2) for bending or abnormal stem
wear.
If necessary, replace the valve (page 12-4).
Measure and record each valve stem O.D.
STANDARD:
IN: 5.468 – 5.480 mm (0.2153 – 0.2157 in)
EX: 5.425 – 5.440 mm (0.2136 – 0.2142 in)
SERVICE LIMIT:
IN: 5.318 mm (0.2094 in)
EX: 5.275 mm (0.2077 in)
If the measurement is less than the service limit,
replace the valve (page 12-4).
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding
guide I.D. to obtain the guide-to-stem clearance.
STANDARD:
IN: 0.020 – 0.044 mm (0.0008 – 0.0017 in)
EX: 0.060 – 0.087 mm (0.0024 – 0.0034 in)
SERVICE LIMIT:
IN: 0.10 mm (0.004 in)
EX: 0.12 mm (0.005 in)
If the calculated clearance is more than the service limit,
replace the valve and valve guide as a set (page 12-8).
CYLINDER HEAD
(1)
(2)
12-7