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CAUTION
• Use cutting oil when correcting valve guide
with a reamer.
• Turn the reamer in same direction when
inserting or rotating.
• Correct valve seat, and clean up all metal residues
from cylinder head.
Valve Seat Inspection and Service:
• Clean up all carbon
deposits on intake and
exhaust valves.
• Polish valve face
lightly with emery.
• Grind valve seat with
manual grinding tool.
CAUTION
• Do not let emery enter between valve stem and
valve guide.
• Clean up the emery after corrected, and apply
engine oil onto contact faces of valve and valve seat.
• Remove the valve and check its contact face.
Valve seat inspection:
• If the valve seat is too wide, narrow or rough,
it needs correcting.
Valve seat width:
Service limit: 1.6mm
• Check the contact
condition of valve seat.
Valve seat grinding:
• The worn valve seat has
to be ground with valve
seat chamfer cutter.
• Refer to operation
manual of the valve seat
chamfer cutter.
• Use 45° valve seat chamfer cutter to cut any rough
or uneven surface from valve seat.
CAUTION
• After valve guide has been replaced, it has to
be ground with 45° valve seal chamfer cutter to
correct its seat face.
• Use 32° cutter to cut
upper part.
Valve Seat Inspection and Service:
• Use 60° cutter to cut lower parts out.
• Remove the cutter and check new valve seat.
• Use 45° cutter to grind
the valve seat to
specified width.
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