Valve Spring Free Length - Honda GX690 Workshop Manual

CYLINDER
Measure and record each valve guide I.D.
STANDARD:
SERVICE LIMIT:
If the measured valve guide I.D. is more than the
service limit, replace the cylinder (page 14-5).
VALVE STEM O.D.
Inspect each valve for bending or abnormal stem wear.
If necessary, replace the valve (page 14-5).
Measure and record each valve stem O.D.
STANDARD:
IN: 5.475 – 5.490 mm (0.2156 – 0.2161 in)
EX: 5.435 – 5.450 mm (0.2140 – 0.2146 in)
SERVICE LIMIT:
IN: 5.400 mm (0.2126 in)
EX: 5.300 mm (0.2087 in)
If the measurement is less than the service limit,
replace the valve (page 14-5).
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding
valve guide I.D. to obtain the stem-to-guide clearance.
STANDARD:
IN: 0.010 – 0.037 mm (0.0004 – 0.0015 in)
EX: 0.050 – 0.077 mm (0.0020 – 0.0030 in)
SERVICE LIMIT:
IN: 0.110 mm (0.0043 in)
EX: 0.130 mm (0.0051 in)
If the calculated clearance is more than the service limit,
replace the following:
– Valve (page 14-5)
– Cylinder (page 14-5)

VALVE SPRING FREE LENGTH

Measure the valve spring free length.
STANDARD:
SERVICE LIMIT: 36.8 mm (1.45 in)
If the measured length is less than the service limit,
replace the valve spring (page 14-5).
14-8
5.500 – 5.512 mm
(0.2165 – 0.2170 in)
5.560 mm (0.2189 in)
38.3 mm (1.51 in)