Service Manual

44 44
VALVE
If valve does not contact all way around with seat, lap
valve into seat.
1. Coat fine lapping compound sparingly on valve face.
2. Rotate valve in circular motion with valve lapper (A).
N 0 T E : Lapping mark should appear on or near center of
va
1 ve face.
3. Check valve every 8 to 10 strokes and continue lapping
until uniform ring appears on valve seat all way around.
4. After lapping, wash parts in solvent to remove compound.
Dry parts thoroughly.
1.
2.
3.
4.
5.
Reface valve seat with 45’ cutter, removing only
enough material to make smooth and concentric seat.
Use
30° cutter to narrow seat width to 0.53 1.16 mm
(0.021 0.046 in. 1.
A : Seat width
Make a
light pass with 45’ cutter to remove any burr
at edge of seat.
Coat marker and check contact of valve face and seat.
Contact should be at center part of valve face as shown
and all way around.
Lap valve into seat. (See LAPPING.)
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