1D-42 Engine Mechanical:
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 (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) 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)
(B): 09900–20701 (Dial gauge chuck)
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.): 4.975 – 4.990 mm (0.1959 – 0.1965 in)
Standard (EX.): 4.955 – 4.970 mm (0.1951 – 0.1957 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-44)”.
Valve Stem End Condition
Inspect the valve stem end face for pitting and wear. If
pitting or wear of the stem end face are present, the
valve stem end may be resurfaced, providing that the
length “A” will not be reduced to less than the service
limit. If this length becomes less than the service limit,
the valve must be replaced.
Valve stem end length
Service limit: 2.3 mm (0.09 in)
“a”
I649G1140233-02
“Y”
“X”
(A)
(B)
I931H1140165-01
(A)
I718H1140122-01
“A”
I827H1140065-01
Summary of Contents for 2009 LT-A500XP
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Page 14: ...00 9 Precautions ...
Page 224: ...1E 3 Engine Lubrication System EXHAUST SIDE INTAKE SIDE I931H1150003 02 ...
Page 304: ...1K 4 Exhaust System ...
Page 346: ...2D 5 Wheels and Tires ...
Page 438: ...3D 26 Propeller Shafts ...
Page 482: ...4D 6 Parking Brake ...
Page 512: ...5A 28 Automatic Transmission ...
Page 624: ...Prepared by December 2008 Part No 99500 44080 03E Printed in U S A 624 ...