5-77
E
POWR
VALVES AND VALVE SPRINGS
4. Use a 60° cutter to adjust the contact width
of the bottom edge of the valve seat.
b
Previous contact width
60˚
b
5. Use a 45° cutter to adjust the contact width
of the valve seat to specification.
b
Previous contact width
c
Specified contact width
45˚
b
c
6. If the valve seat contact area is too wide
and situated in the center of the valve
face, use a 30° cutter to cut the top edge
of the valve seat, a 60° cutter to cut the
bottom edge to center the area and set its
width.
b
Previous contact width
7. If the valve seat contact area is too narrow
and situated near the top edge of the valve
face, use a 30° cutter to cut the top edge
of the valve seat. If necessary, use a 45°
cutter to center the area and set its width.
b
Previous contact width
8. If the valve seat contact area is too narrow
and situated near the bottom edge of the
valve face, use a 60° cutter to cut the bot-
tom edge of the valve seat. If necessary,
use a 45° cutter to center the area and set
its width.
b
Previous contact width
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