Suzuki SFV650, Service Manual

Page: 239 / 573

Engine Mechanical: 1D-50
Valve head radial runout
Place the dial gauge at a right angle to the valve head
face and measure the valve head radial runout. If it
measures more than the service limit, replace the valve.
Special tool
(A): 09900–20607 (Dial gauge (1/100 mm, 10
mm))
(B): 09900–20701 (Magnetic stand)
(C): 09900–21304 (V-block (100 mm))
Valve head radial runout (IN. & EX.)
Service limit: 0.03 mm (0.001 in)
Valve Face Wear
Visually inspect each valve face for wear. Replace any
valve with an abnormally worn face. The thickness of the
valve face decreases as the face wears. Measure the
valve head “a”. If it is out of specification replace the
valve with a new one.
Special tool
: 09900–20102 (Vernier calipers (1/20 mm, 200
mm))
Valve head thickness “a” (IN. & EX.)
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”, 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)
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.): 4.475 – 4.490 mm (0.1762 – 0.1768 in)
Standard (EX.): 4.455 – 4.470 mm (0.1754 – 0.1760 in)
(A)
(B)
(C)
I649G1140232-03
“a”
I649G1140233-02
“X”
“Y”
(A)
(B)
I944H1140237-01