SELVA MARINE Fin Whale 225 EFI, Service Manual

Page: 151 / 399

6AL3J11
5-50
1
2
3
4
5
6
7
8
9
a
Slag or rough surface
CAUTION:
Do not over cut the valve seat. Be sure to
turn the cutter evenly downward at a pres-
sure of 40
– 50 N (4 – 5 kgf, 8.8 – 11 lbf) to
prevent chatter marks.
3. Use a 30 ° cutter to adjust the contact
width of the top edge of the valve seat.
b
Previous contact width
4. Use a 60 ° cutter to adjust the contact
width of the bottom edge of the valve
seat.
b
Previous contact width
5. Use a 45 ° cutter to adjust the contact
width of the valve seat to specification.
b
Previous contact width
c
Specified contact width
6. Check the valve seat contact area of the
valve.
NOTE:
To check the valve seat contact area, see
Chapter 5,
“ Checking the valve seat. ”
7. If the valve seat contact width 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
S69J5880
30˚
b
S69J5890
60˚
b
S69J5900
45˚
b
c
Cylinder head