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4-10
CLUTCH
CLUTCH, TRANSMISSION, UNIVERSAL JOINT
(138)
Figure
4-12-Clutch Spring, Cross Section-Series 40-50
The Series 40-50 clutch spring will flatten
slightly due to the metal taking a permanent set,
which is characteristic of any type of spring
after
continued
flexing. The normal height of a
new
spring
is 1 1 0/1 6". See figure
4-12.
After
only a
short
period of usage this height will be
reduced somewhat;
however,
if height is not
less than
111;1 6"
the spring will still retain suf-
ficient
pressure
to
prevent
clutch slippage and
will operate satisfactorily providing, of course,
that spring is not cracked. NOTE: T
esting
a
clutch spring by standing on it and jumping up
and down
,
forcing spring through does not nec-
essarily indicate spring should be replaced.
5.
Clutch Springs
-
1948
Series 70. Inspect
springs for cracks or distortion. If test equip-
MINIMUM HEIGHT
"A"
=
1'J.1."
NORMAL HEIGHT "A"
=
l'
~."
cover is otherwise serviceable, the ears should
be bent as required, using care to avoid crack-
ing the metal.
3. Clutch Cover
-1948
Series 70. Inspect
clutch cover for cracks or distortion. Place pres-
sure plate in cover and check clearance between
driving lugs and edges of slots in cover, using
feeler gauges. The clearance should be .005" to
.008"; excessive clearance may cause rattle de-
scribed in paragraph 4-6 (subpar. b.).
4. Clutch
Spring-Series
40-50. Inspect clutch
spring for
cracks,
particularly at inner edge.
Cracks weaken the spring and make replace-
ment necessary.
It
is a normal condition to have some wear at
the inner edge of
spring,
resulting from release
bearing sliding
radially
on clutch spring. Due
to variation in diameters of holes, the contact
of bearing race may be at varying distances
from edge of hole in different springs. If hole
is of small diameter,
release
bearing forms
de-
pression having centers approximately 0/16" from
edge of hole
.
This type of wear does not affect
the operation or efficiency of the clutch spring;
the spring should not be discarded un
less
the
depression is worn deep enough to cut through
the metal. If hole is of large
diameter,
bearing
will be at edge of hole resulting in thin metal.
Unless the metal is worn to a sharp knife edge,
the spring will operate satisfactorily and should
not be discarded.
4
- 13 CLEA N I N G
AND
I
NSPECTION O
F
CLUTCH PARTS-ALL SERIES
Figure
4-11-Setting
of Spring Retainer Ears on Cover
2. Clutch
Cover-Series
40-50.
Inspect clutch
.over for cracks or
distortion.
Place cover on a
lat surface and
measure
setting of each of the
ri x
ears where spring retainers are attached.
l'he dimension from flange
surface
of cover to
:op surface of each ear should be 1
%
inch. See
igu
r e 4-11. If dimension is not 1% inch, and
Wash all metal parts of clutch, except release
bearing and driven plate, in gasoline, kerosene,
or other cleaning solution to remove dirt and
grease. Soaking release bearing in cleaning so-
lution may permit solution to seep into bearing
and destroy the lubricant. Soaking driven plate
in cleaning solution may damage the
facings.
1. Flywheel and
Pressure Plate.
Examine fric-
tion surfaces of flywheel and pressure plate for
scoring or roughness. Slight roughness may be
smoothed with fine emery cloth, but if surface
is deeply scored or grooved the part should be
replaced.
Place the driven plate and the pressure plate
and cover assembly in fixture and compress the
clutch springs to relieve pressure on release
levers. Remove metal spacers if these were in-
stalled during removal of
assembly.
.
3. Remove nuts from the three release lever
pivot screws, then relieve pressure on clutch
springs. Remove assembly from fixture and
separate all the parts for cleaning and inspec-
tion.
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