REPAIRING THE
VALVE
SEAT
1.
Clean the valve seat surface.
2.
Use a 45° cutter suitable for the valve guide and the valve seat.
3.
Grind the upper surface of valve seat with
15°
cutter
so
that the valve seat fits
to
the valve
center
(so
as
to ensure a = b
as
shown
in
the figure.).
NOTE: After correcting the valve seat, check for valve recessing.
B 15° cutter A 45° cutter
(1)
Valve
(2) Corrected surface
of
valve seat
CHECKING
VALVE
RECESSING
1.
Clean the face of the valve.
2.
Measure the recessing with a depth gauge.
3.
See engine specifications.
108
How
to
repair
the
valve seat
B
(2)
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