Chapter IV Disassembly & Repair
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c. Check
1) Outer diameter of valve stem
Check outer diameter of valve stem with micrometer.
Replace a new valve when the diameter is less or more
than maintenance limit or there are the visible ablation or
crack on valve surface with naked eyes.
2) Free length of valve spring
Measure the free length of valve spring.
Replace the spring if the inner diameter is less or more than
maintenance limit.
3) Cylinder head
Remove the carbon deposition in combustor and
gasket residues attached on the cylinder head.
Check whether there are cracks on spark plug hole
valve seat surface and valve guide.
Check whether the cylinder block is deformed with
ruler and feeler gauge.
4) Valve guide
Check:
a) Check whether the internal surface of the valve guide is
smooth and clean, with scratch and strain; whether
the coordination between valve guide and cylinder
Replace it in case of
exceeding 0.10 mm
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