Suzuki GSF600Y 2000 Service Manual page 92

3-54 ENGINE
VALVE FACE WEAR
Visually inspect each valve face for wear. Replace any valve with
an abnormally worn face. The thickness of the valve face de-
creases as the face wears. Measure the valve face T. If it is out of
specification replace the valve with a new one.
" 09900-20102: Vernier calipers
# Valve face thickness T
Service Limit: 0.5 mm (0.02 in)
VALVE STEM DEFLECTION
Lift the valve about 10 mm (0.39 in) from the valve seat. Measure
the valve stem deflection in two directions, "X" and "Y", perpen-
dicular to each other. Position the dial gauge as shown. If the
deflection exceeds the service limit, then determine whether the
valve or the guide should be replaced with a new one.
" 09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
# Valve stem deflection (IN & EX)
Service Limit: 0.35 mm (0.014 in)
VALVE STEM WEAR
Measure the valve stem O.D. using the micrometer. If it is out of
specification, replace the valve with a new one. If the valve stem
O.D. is within specification but the valve stem deflection is not,
replace the valve guide. After replacing the valve or valve guide,
recheck the deflection.
" 09900-20205: Micrometer (0 – 25 mm)
# Valve stem O.D.
Standard (IN) : 4.965 – 4.980 mm (0.1955 – 0.1961 in)
(EX) : 4.955 – 4.970 mm (0.1950 – 0.1957 in)
NOTE:
If valve guides have to be replaced, refer to the valve guide ser-
vicing steps below.
10 mm