SECTION 4. DISASSEMBLY AND SERVICE
c.INSPECTION
1) VALVE STEM O.D.
Inspect each valve stem’s outer diameter, if it is less than
standard value or beyond service limit, or valve face has
visible burns or cracks, replace it with a new one.
Standard Service limit
IN 4.968 mm 4.906 mm
EX 4.928 mm 4.763 mm
2) SPRING FREE LENGTH
Measure the free length of each valve spring, if it is less than
standard value or beyond service limit, replace the spring.
3) CYLINDER HEAD
Remove carbon deposits from the combustion chamber.
Clean off any gasket material from the cylinder head surface.
Check spark plug hole and valve areas, and valve guides for
cracks.
Check the cylinder head for warpage with a straight edge and
a feeler gauge.
4) VALVE GUIDE
INSPECTION:
a) Check valve guide’s inner surface for flatness, smoothness,
scratches, and scores; check whether fit between valve guides
and cylinder head is firm.
b)
Ream the valve guides to remove any carbon deposits before
Standard Service limit
26.5 mm 25 mm
Service limit
Replace if warpage
exceeds 0.10 mm
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