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In reassembly;
1) Clean carbon and gum deposits from the valves, seats, ports and valve stem holes.
2)
Replace valves, if badly burned, pitted or warped.
3)
Correct the valve seat by using
45"
seat cutter
tool
as illustrated in
Fig.
6-3-3.
The seat should be
finished
to
1.2-1 Smm
(.04-.05
inch) in width.
4)
Cylinder block should be replaced if valve stem clearance becomes excessive. 'Refer to Fig. ..-'
4
for
clearance specifications and proper assembly.
5)
After correcting valve seats,
lap
valves in
place
until a uniform ring will show entirely around the face
of
the
valve. Clean valves, and wash block thorough with
a
hot solution
of
soap and water. Wipe cylinder walls
with clean lint free rags and light engine oil.
CAUTION:
DO
NOT ASSEMBLE VALVE SPRINGS AND SPRING RETAINERS
AFTER
ADJUSTING
TAPPET CLEARANCE.
Fig.
6-3-3
VALVE
and
VALVE STEM HOLE CLEARANCE
A
-
VALVE FACE ANGLE
4
5"
I
B
-
SEAT ANGLE
I
45"
I
C
-
GUIDE INSIDE DIA.
I
8
DIA.
+:.036
(::!;::)
I
INTAKE
8
DIA.
-0:oss
(
:313rr)
-0
030
3168'
D
-
VALVE STEM DIA.
EXHAUST
8
DIA.
1:::;;
(
::fi::)
MAXIMUM ALLOWABLE
CLEARANCE BETWEEN
C
and
D
INTAKE
0.030-0.09
1
(.0012"-.0036")
EXHAUST
0.090-0.146
(.0035"-,0057")
Fig.
6-3-4
-1
3-