Suzuki VLR1800 Service Manual page 263

Valve Stem / Valve Face Wear Condition
Visually inspect each valve stem and valve face for wear
and pitting. If it is worn of damaged, replace the valve
with a new one.
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", perpendicular to each other, positioning the dial
gauge as shown in the figure. If the deflection measured
exceeds the service limit, then determine whether the
valve or the guide should be replaced with a new one.
Special tool
(A): 09900–20607 (Dial gauge (1/100 mm, 10
mm))
(B): 09900–20701 (Magnetic stand)
Valve stem deflection (IN. & EX.)
Service limit: 0.35 mm (0.014 in)
"Y"
I822H1140147-01
(A)
"X"
(B)
I822H1140145-03
Valve Stem Wear
Measure the valve stem O.D. using the micrometer.
If the valve stem is worn down to the limit, as measured
with a micrometer, replace the valve.
If the stem is within the limit, then replace the guide.
After replacing valve or guide, be sure to recheck the
deflection.
Special tool
(A): 09900–20205 (Micrometer (0 – 25 mm))
Valve stem O.D.
Standard (IN.): 5.975 – 5.990 mm (0.2352 – 0.2358 in)
Standard (EX.): 5.955 – 5.970 mm (0.2344 – 0.2350 in)
NOTE
If valve guides have to be removed for
replacement after inspecting related parts,
carry out the steps shown in valve guide
replacement. Refer to "Valve Guide
Replacement (Page 1D-53)".
Valve Seat Width
1) Visually check for valve seat width on each valve
face. If the valve face has worn abnormally, replace
the valve.
2) Coat the valve seat with a red lead (Prussian Blue)
and set the valve in place.
3) Rotate the valve with light pressure.
Special tool
(A): 09916–10911 (Valve lapper set)
Engine Mechanical:
(A)
I718H1140122-01
(A)
I822H1140148-01
1D-52