ENGINE 3-23
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.
% Valve head radial runout:
Service Limit: 0.03 mm
$ 09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block (100 mm)
VALVE STEM DEFLECTION
• Lift the valve about 10 mm from the valve seat.
• Measure the valve stem deflection in two directions, perpen-
dicular to each other, by positioning the dial gauge as shown.
• If the deflection measured exceed the limit, then determine
whether the valve or the guide should be replaced with a new
one.
% Valve stem deflection (IN & EX):
Service Limit: 0.35 mm
$ 09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
VALVE STEM DIAMETER
• If the valve stem deflection exceeds the service limit, measure
the valve stem outside diameter.If the diameter measured is
within the standard range, replace the valve guide.
• For each of upper, middle and lower sections within the slid-
ing range, two measurements, each in crosswise direction
must be taken.
% Valve stem O.D.:
Standard (IN): 4.975 – 4.990 mm
(EX): 4.955 – 4.970 mm
$ 09900-20205: Micrometer (0 – 25 mm)
NOTE:
If valve guides have to be removed for replacement after
inspecting related parts, carry out the steps shown in valve
guide servicing. (!3-24)
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