Suzuki 2009 LT-A750XK9, Service Manual

Page: 187 / 711

Engine Mechanical: 1D-36
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
: 09900–20101 (Vernier calipers (1/15 mm, 150
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) “a” from the valve
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)
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.
Special tool
(A): 09900–20205 (Micrometer (0 – 25 mm))
Valve stem O.D.
Standard (IN.): 5.475 – 5.490 mm (0.2156 – 0.2161 in)
Standard (EX.): 5.455 – 5.470 mm (0.2148 – 0.2154 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-38)”.
“a”
I649G1140233-02
(A)
(B)
I831G1140164-02
(A)
I718H1140122-01