Transmission Slipping Out Of Gear; Transmission Sticking In Second Gear - Cadillac 1937 LaSalle VVI Information

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T R A N S M I S S I O N
2. Correction of Gear C l a s h
Gear clash when shifting into low is usually
due to incomplete clutch disengagement or to the
driver's failure to wait long enough for the gears
to stop spinning before shifting after disengaging
the clutch. T h i s is not a transmission fault and
can be corrected only by proper d r i v i n g instruc-
tion.
Gear clash when shifting into h i g h or second
speed w i t h series 37-50, 60, 65, 70, 75 a n d 85
transmissions is usually due to weak detent
springs. T h i s condition can be corrected b y
installing three new detent springs, part N o .
1419424. These springs m a y be installed without
disassembling the synchronizing unit.
Gear clash when shifting into h i g h or second
w i t h series 37-90 transmissions is usually due
to incorrect yoke travel. T h e remedy is to check
the yoke travel and adjust to inch as out-
lined in Plate 52.
3. T r a n s m i s s i o n Slipping O u t of Gear
Series 37-50, 60, 65, 70, 75 and 85
Cases of the transmission slipping out of high
gear on series 37-50, 60, 65, 70, 75 a n d 85 cars
m a y be due to the following conditions:
1. A misaligned or wrinkled gasket between
the transmission and the clutch housing. T h e
remedy is correct installation of a new gasket.
2. Improperly machined bosses o n the high
speed synchronizing drum, w h i c h m a y tilt the
shifting flange and cause the sliding gear coupling
to work out of mesh. T h e remedy is replacement
of the synchronizing assembly.
Slipping out of second gear on these same series
cars m a y be caused b y :
• 1. A broken snap ring for the second speed
gear. T h e remedy is to install a new snap ring,
t a k i n g care to remove all pieces of the broken r i n g
before m a k i n g the installation.
2. Insufficient relief between the m a i n shaft
splines and the sliding gear coupling 'to provide
proper a n d complete engagement w i t h the trans-
mission gears. T h e remedy is t o replace the
m a i n shaft.
Series 37-90
Slipping out of high gear o n series 37-90 cars
m a y be due t o : .
1. M i s a l i g n m e n t of the transmission, due to a
variation i n the crankcase bell housing. T h i s
can be corrected b y refacing the bell housing as
explained i n note 14.
2. Transmission sticking on guide pins. In-
spect the dowel pin holes i n the transmission case
to make certain that the pins do n o t contact
w i t h the transmission when i n position b u t serve
simply as guide pins when assembling. If the
pins do bind, the holes i n the transmission case
should be enlarged.
Slipping out of second gear on series 37-90 is
usually caused b y incorrect adjustment of the
bearings for the transmission gears.
Proper adjustment of the bearings for the low
and intermediate transmission gears on series
37-90 cars is maintained by means of spacers on
the transmission m a i n shaft between the two
tapered roller bearings for each gear. (See P l a t e
51, F i g . 3).
A n y looseness that might develop at this point
would have a tendency to cause slipping out of
gear in low or intermediate gear.
Correction should be made b y :
1. M a k i n g sure that the main shaft assembly
retaining screw is securely tightened.
2. M a k i n g sure that the tapered roller bear-
ings are in proper adjustment.
T h e low a n d intermediate gears should have a
slight drag. If the bearings are loose, dress down
both spacers between the bearings until a slight
drag is felt on the gears. I n case a spacer is
unintentionally dressed down too much, a new
spacer must be used, of the required thickness.
T h e dressing down operation m a y be performed
by laying a sheet of emery paper o n a piece of
glass or on a surface plate and m o v i n g the spacer
about on it i n a circular motion. T h e thickness
of the spacer should be gaged with a micrometer
to make sure it is the same at all points.
4. T r a n s m i s s i o n Sticking i n Second Gear—
Series 37-50 to 85 i n c l .
Trouble caused b y the transmission sticking in
second gear is ordinarily due to the shifting
flange catching on the ends of the synchronizing
pins. T h e remedy is replacement of the complete
synchronizing unit w i t h a new one having the
latest type synchronizing pins with chamfered
ends as shown i n Plate 54, F i g . 14.
5. Noise o n Reversing—Series 37-50 to 85 incl.
A snapping noise coming from the transmission
when a car is being reversed is due to loose splines
in the universal j o i n t yoke at the rear end of the
main shaft.
x
T h i s condition can be corrected, in m a n y
instances, b y tightening the screw that holds the
yoke i n place, as this will often take u p enough
play to insure quiet operation. If this does not
remedy the condition, it will be necessary to
replace the yoke.
6. Shifter Lever Rattle—Series 37-50 to 85
incl.
A rattle i n the transmission shifter lever is
usually due to a weak or improperly installed
shifter lever spring.
T h e remedy for this is to install a new spring i n
the position shown in Plate 54, F i g . 1 5. Use spring
part N o . 1420183, for all 37-series inertia type
transmissions. U s e p i n , part N o . 1420200, for
series 37-50, 60 and 85 transmissions; a n d pin,
part N o . 1422110 for series 37-65, 70 and 75
transmissions.