Ch. 6 CYLINDER HEAD & VALVE
6-10
Valve Stem Replacement
Heat up cylinder head to 100-150 ℃ with heated
plate.
Caution
Do not let torch heat cylinder head directly.
Otherwise, the cylinder head may be
deformed as heating it.
Wear on a pair of glove to protect your hands
when operating.
Hold the cylinder head，and then press out old
valve guide from combustion chamber side.
Tool: Valve guide driver: 5.0 mm
Caution
Check if new valve guide is deformation
after pressed it in.
When pressing in the new valve guide,
cylinder head still have to be kept in
100-150℃.
Adjust the valve guide driver and let valve guide
height is in 13 mm.
Press in new valve guide from rocker arm side.
Tool: Valve guide driver: 5.0 mm
Wait for the cylinder head cooling down to room
temperature, and then correct the new valve
guide with reamer.
Caution
Using cutting oil when correcting valve
guide with a reamer.
Turn the reamer in same direction when It
be inserted or rotated.
Correct valve seat，and clean up all metal
residues from cylinder head.
Tool: Valve guide reamer: 5.0 mm
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