Suzuki GSF650A Service Manual page 254

1D-42 Engine Mechanical:
Valve Stem Runout
Support the valve using V-blocks, as shown, and check
its runout using the dial gauge. If the runout exceeds 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 stem runout (IN. & EX.)
Service limit: 0.05 mm (0.002 in)
(A)
(C)
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)
(A)
(C)
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)
(B)
Valve Stem Deflection
Lift the valve about 10 mm (0.39 in) "a" from the valve
I649G1140231-03
seat. Measure the valve stem deflection in two
directions, "X" and "Y", perpendicular 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.
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)
(B)
I649G1140232-03
"a"
(A)
(B)
"X"
"Y"
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