8-9
Cylinder Head / Valve
Trim the reamer not to lean. If cutting the
reamer by leaning, the valve hole is inclined,
the step seal is leaked, and the around of valve
seat is enlarged. So the around of seat is not
amended.
The entrance of reamer is always performed by
turning the reamer to the right. If not, the guide
inside is damaged.
Tool: Valve guide reamer
Clean the cylinder head and remove the
foreign substances.
Check the around of valve seat and amend
them.
Valve Seat Inspection
Remove the carbon deposits of valve.
Coat the valve of cylinder head with the ink
thinly.
Trim valve guide reamer using a valve guide
dreamer without turning the valve, and align
the position exactly.
Tale off the valve, inspect the opposite side of
the seat with the ink attachment of valve pace
side.
If the valve seat is damaged, amend the valve seat.
If the valve is inclined, inspect the valve guide-
to-step gap and replace valve guide if
necessary.
It is impossible to amend the valve. If the valve
pace clogging, wear and connection are bad,
the valve must be replaced.
Measure the valve seat width.
Standard Value : 0.7~0.9(0.028~0.035)
Service Limit : 1.3mm(0.05in)
Valve Seat Cutter
Amend the worn valve seat using a valve seat
cutter and a grinder.
Perform them according to the instruction
manual.
60
。
35
。
45。
IN : 22mm
Ex : 22mm
IN : 23mm
EX : 20mm
IN : 24.5mm
Ex : 24.5mm
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CAUTION
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CAUTION
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CAUTION
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Valve
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