6D45F11
5-28
9
8
7
6
5
4
3
2
1
Cylinder head
Refacing the valve seat
1.
Reface the valve seat with the valve seat
cutter.
2.
Cut the surface of the valve seat with a
45° cutter by turning the cutter clockwise
until the valve seat face has become
smooth.
a
Slag or rough surface
c
C
Do not over cut the valve seat. Make sure
to turn the cutter evenly downward at a
pressure of 40–50 N (4–5 kgf, 8.8–11 lbf) to
prevent chatter marks.
3.
Use a 5° 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
5
45
60
6D450670
6D450700
5
b
60
6D450710
6D450720
45
6D450690
6D450680
Valve seat cutter holder:
90890-06316
Valve seat cutter:
5° (intake): 90890-06314
5° (exhaust): 90890-06313
45° (intake and exhaust):
90890-06312
60° (intake and exhaust):
90890-06315
6D45F11-05 03.10.9 20:44 Page 31
