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INSPECTION AND REPAIR
3.Measure:
Valve seat width a
Out of specification → Reface the valve
seat.
Valve seat width:
Intake:
Exhaust:
*********************************
Measurement steps:
Apply
the
(Dykem) 1 to the valve face.
Install the valve into the cylinder head.
Press the valve through the valve guide
and onto the valve seat to make a clear
pattern.
Measure the valve seat width. Wherever
the valve seat and valve face made con-
tact, blueing will have been removed.
If the valve seat width is too wide, too nar-
row, or seat has not centered, the valve
seat must be refaced.
*********************************
4.Reface:
Valve seat
Use a 30°, 45° and 60° valve seat cutter 1.
CAUTION:
When twisting the cutter, keep an even
downward pressure (4 ~ 5 kg) to prevent
chatter marks.
Cut section as follows
Section
A
B
C
4 - 17
ENG
0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
Mechanic's
blueing
Cutter
30°
45°
60°
dye
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