ENGINE
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1、CHECK
• valve sealing
Leakage at the valve seat
Check the valve
face, valve seat and valve seat width.
a. Pour a clean solvent ① into the intake and
exhaust ports.
b. Check that the valve seals properly. There
should be no leakage at the valve seat ②.
• valve face
Pitting/wear
Grind the face.
• valve stem end
Mushroom shape or diameter larger than the
body of the stem
Replace.
• valve seats
Pitting/wear
Reface the valve seat.
2、MEASURE:
1).Measure:
• The valves surface width
Repairing limit value
2.0mm
• stem-to-guide clearance
Stem-to-guide clearance = valve guide
inside diameter – valve stem diameter
NOTE:
If the mating surface is coarse, corrode or
cannot contact with valve seat normally,
replace it.
Stem-to-guide clearance
repairing limit value
Intake:0.12mm Exhaust:0.14mm
• margin thickness (a)
Out of specification
Replace.
Margin thickness
Intake:2 mm
Exhaust:2.2 mm
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