10-28
[1]
CONTACT
TOO HIGH
[3]
CONTACT
TOO LOW
[2] OLD SEAT
WIDTH
[2] OLD SEAT
WIDTH
30˚ – 32˚
60˚
[5]
CUTTER HOLDER,
5.5 mm
07781-0010101
[1] VALVE SEAT CUTER
[2]
IN, 35 mm: 07780-0010400
EX, 33 mm: 07780-0010800
[3]
IN, 37.5 mm: 07780-0014100
EX, 30 mm: 07780-0014000
[4]
IN, 38.5 mm: 07780-0012400
EX, 33 mm: 07780-0012900
60˚
32˚
9. VALVE SEAT RECONDITIONING
1) Thoroughly clean the combustion chambers and valve
seats to remove carbon deposits. Apply a light coat of
Prussian Blue compound or erasable felt-tipped marker ink
to the valve faces.
2) Insert the valves, and then lift them and snap them closed
against their seats several times. Be sure the valve does not
rotate on the seat. The transfered marking compound will
show any area of the seat that is not concentric.
[1]
VALVE FACE
3) Using a 45˚ cutter, remove enough material to produce a
smooth and concentric seat. Follow the Valve Seat Cutter
Manufacturer's Instructions.
Turn the cutter clockwise, never counterclockwise.
Continue to turn the cutter as you lift it from the valve seat.
TOOLS:
Cutter holder, 5.5 mm
07781-0010101
Valve seat cutter, 45˚ 35 mm
07780-0010400
Valve seat cutter, 45˚ 33 mm
07780-0010800
Valve seat cutter, 32˚ 38.5 mm
07780-0012400
Valve seat cutter, 32˚ 33 mm
07780-0012900
Valve seat cutter, 60˚ 30 mm
07780-0014000
Valve seat cutter, 60˚ 37.5 mm
07780-0014100
4) Use the 30˚ – 32˚ and 60˚ cutters to narrow and adjust the
valve seat so that it contacts the middle of the valve face.
The 30˚ – 32˚ cutter removes material from the top edge.
The 60˚ cutter removes material from the bottom edge. Be
sure that the width of the finished valve seat is within
specification.
45˚