Chapter V Disassembly & Repair
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Free length of the valve spring
Measure the free length of valve spring.
Standard
Maintenance Limit
39.5~40.5 mm 39 mm
Replace the spring if the maintenance limit is exceeded.
Width of valve seat
Remove the carbon deposition in combustor and check if
the valve seat has corrosion or damage.
Measure the width of valve seat.
Standard
Maintenance Limit
0.7~0.8 mm 2.0 mm
If the width of valve seat is less than the standard value or
exceeds the maintenance limit, trim the valve seat once.
Cylinder head
1. Remove the carbon deposition in combustor and residues
of gasket attached onto the cylinder head.
2. Check if there is any crack at the spark plug hole, valve
seat surface and valve pipe.
3. Check if there is deformation of cylinder head with straightedge
or thickness gauge as shown in the figure.
Maintenance Limit
0.10 mm
Outer diameter of valve stem
Check each conical side of the valve to see if there is any uneven,
curved or abnormal wear of valve stem.
Replace the valve if necessary. Measure and record the outer
diameter of each valve stem.
Standard
Maintenance Limit
STRAIGHT EDGE
FEELER GAUGE
Straightedge
Thickness gauge
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