65
Stem–to–
guide
Int 0.020–0.047 mm
(0.0008–0.0018 in.)
0.07 mm
(0.0035 in.)
clearance
Exh 0.035–0.062 mm
(0.0014–0.0024 in.)
0.09 mm
(0.0035 in.)
If bore gauge is not available, check end deflection of the
valve stem in place with a rigid dial gauge.
Move stem end in the directions (1) and (2) to measure
end deflection.
If deflection exceeds its limit, replace valve stem and
valve guide.
Valve stem end
deflection limit
Intake 0.14 mm (0.0055
in.)
Exhaust 0.18 mm (0.0070
in.)
Valves
Remove all carbon from valves.
Inspect each valve for wear, burn or distortion at
its face and stem and replace as necessary.
Measure thickness of valve head. If measured
thickness exceeds its limit specified below,
replace valve.
Valve head thickness
Standard Limit
1.0 mm
Intake 0.6 mm (0.0236 in.)
(0.039 in.)
Exhaust 0.7 mm (0.0275 in.)
Check end face of each valve stem for wear.
This face meets rocker arm intermittently in
operation, and might become concave or other-
wise irregular. As necessary, smoothen the end
face with an oil stone and, if this grinding
removes the end stock by as much as 0.5 mm
(0.0196 in.) (as measured from the original
face), replace the valve.
Limit on stock allow-
ance of valve stem end
face
0.5 mm (0.0196 in.)
check each valve for radial runout with a dial
gauge and “V” block. To check runout, rotate
valve slowly. If runout exceeds limit, replace
valve.
Limit on valve head radial
runout
0.08mm (0.003 in.)
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