8-7
Cylinder Head / Valve
Inspect the spark plug assembly hole and the
crack of near valve seat. Check for the warp of
the cylinder head with a square and filler
gauge.
Service Limit : 0.1mm(0.004in)
Valve Spring
Measure the free field of valve spring.
Service Limit : 40.0mm(1.57in)
If any valve spring is shorter than the service
limit, it must be replaced as a set.
Valve Step-To-Guide Clearance
Inspect the bent, clogging, damaging, and step
wear of valve.
Check the valve step with valve guide.
Measure the valve step outside diameter and
record it.
Service Limit : IN) 4.925mm(0.1939in)
EX) 4.905mm(0.1931in)
After inserting the valve guide reamer to the
combustion chamber, remove the carbon
deposits.
The incoming and outgoing of reamer should
be performed by turning the reamer to the
right. If the entrance of reamer without turning
or turing to the left, the guide inside will be
damaged.
Tool: Valve guide reamer
Measure the valve guide inside diameter and
record it.
Service Limit : 5.03mm(0.198 in)
Calculate the valve step and guide clearance.
Service Limit : IN) 0.08mm (0.003 in)
EX) 0.10mm (0.004 in)
Measure the inside diameter of new valve
guide, and must be replaced with the new
valve if the clearance is not in service limit.
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CAUTION
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CAUTION
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