Honda WB20XT2, Manual

Page: 106 / 132

12-7
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WB20XT2•WB30XT2 CYLINDER HEAD
Measure and record each valve guide I.D.
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.
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.
If the calculated clearance is more than the service limit,
replace the valve and valve guide as a set (page 12-8).
STANDARD: 5.500 – 5.512 mm (0.2165 – 0.2170 in)
SERVICE LIMIT: 5.572 mm (0.2194 in)
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)
(2)
(1)
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)