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SERVlClUG ENGINE
3-30
Put on the valve retainer and, using the valve
lifter, press down the springs, fit the cotter
halves to the
stem end, and
release the lifter
to
allow the cotter
t o wedge in between retainer
and stern. Be sure that the rounded lip
@
of the
cotter fits snugly into the groove Q in
the
stem
end.
CAUTION:
Be sure to
restore each spring
and valve to
their original positions.
09916
-
14510
0991
6
-
8451
0
CAMSHAFT
Both camshafts should be checked for
runout
and also for
wear
of cams and journals
if the
engien has an abnormal noise
or
vibration or
lack of
power output. any
of
these conditions
may
be caused by camshafts worn down
or
dis-
torted
beyond the service limit.
The
exhaust camshaft
can be distinguished
from
that of the intake by the embossed letters
" E X (for
exhaust)
as against letters '7IN'(for
-
Valve
spring
cornpessor
Tweezer
VALVE TIMING
In, open
T.D.C.
Ex.
close
B.D.C.
intake). Similarly, the right end can be distin-
guished by the notch
from
t h e left end.
C A M WEAR
a
Worndown cams are
often
the cause of
mis-
timing valve
operation resulting in reduced
power output.
The limit of
cam wear
is specified
for both intake and
exhaust cams in terms of
cam height
@ ,
which is to be measured with a
micrometer. Replace camshafts if found worn
down
to
the limit.
Cam
height
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