Cadillac 60 Series 1963 Shop Manual page 104

HYDRA-MATIC TRANSMISSION 6-11
6. Line pressure plug not tight.
7. Porous casting.
8. Plug in propeller shaft yoke not tight.
c. Cooler Connections
1. Outside cooler connections improperly in-
stalled or damaged.
2. Damaged sleeve O-ring seals.
3. Cooler pipe to radiator gasket damaged.
4. Flare on pipe damaged at radiator.
d. Filler Tube
1. Damaged or improperly installed O-ring
seal.
2. Filler tube not fully seated in case.
3. Dip stick not in all the way or not seating
properly.
5. Internal Leaks Causing Torus
Drain Back
Torus drain back is a condition where torus oil
slowly drains back into transmission case when
car is parked overnight. This is indicated by car
failing to move and having excessive engine "run-
away" for a few seconds after starting.
When torus drain back is indicated, the follow-
ing points should be checked. See lettered arrows
in Fig. 6-9.
A. Bushing - Flywheel to driven torus hub. In-
spect bushing to determine whether it is loose or
worn excessively.
NOTE: When inspecting bushings, care
should be exercised to determine whether a
bushing is simply "worn in" or worn to such
an extent as to be considered not serviceable.
All bushings wear to a certain degree and will
indicate this wear; however, it would be helpful
to fit the mating parts into the bushing and ob-
serve the amount of looseness.
B. Torus Check Valve - Inspect torus check
valve to make sure it is free in bore of driven
torus member.
C. Bushing - Driving torus hub to driven torus.
Inspect bushing to determine whether it is loose
or worn excessively.
D. Bushing - Front internal gear to intermedi-
ate shaft. Inspect bushing to determine whether it
is loose or worn excessively.
E. Oil Seal Ring - Front unit driven torus
member to front unit driving torus member. In-
spect oil seal ring to determine whether it is cor-
rectly installed and not damaged.
F. Oil Seal Ring - Front unit torus cover to oil
pump. Inspect ring to determine whether it is
correctly installed and not damaged.
G. Bushing - Front unit torus cover to driven
torus shaft. Inspect bushing to determine whether
it is loose or worn excessively.
H. Bushing - Oil pump to front unit driven torus
shaft. Inspect bushing to determine whether it is
loose or worn excessively.
I. Oil Seal Ring - Driven torus shaft to inter-
mediate shaft. Inspect ring to determine if it is
correctly installed and not damaged.
In addition to points shown, leaks at these lo-
cations will also cause torus drain back:
1. Torus Feed Valve - Oil Pump. Inspect torus
feed valve in oil pump to make certain it is free
in bore.
2. Oil Seals - Cooler sleeve oil pump. Inspect
seals to make certain they are not damaged and
are correctly positioned.
6. Tests for Hydra-Matic Noises
Testing for noises requires close attention to
determine the source of trouble. An important
point to remember is that, although Hydra-Matic
transmissions are relatively quiet in operation,
there is always a certain amount of gear noise
when either the front or rear unit is in reduction,
or when in reverse. This is typical of any gear
train when it is operating. Before any test of
Hydra-Matic noise is made, the following factors
must be considered:
1. The engine must be tuned to run smoothly,
so that engine noise is not mistaken for trans-
mission noise.
2. The rubber engine mounting pads, particu-
larly the one under the transmission extension
housing, must be tested for proper torque tight-
ness of attaching screws, and should be visually
checked to assure that no grounding occurs be-
tween engine or transmission and frame.
3. Ample clearance must be present at cowl
and floor pan to be sure that body does not touch
engine, transmission, dipstick tube or linkage
rods. Normal Hydra-Matic noise levels would be
magnified to an unacceptable level if any me-
chanical grounding occurs through frame or body,
and this possibility must be eliminated before
testing.