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GROUP
7
7-1
PART 7-1
PAGE
GENERAL TRANSMISSION SERVICE ....
7-1
PART 7-3
SPECIFICATIONS
PAGE
. . 7-39
PART 7-2
TURBO-DRIVE
AUTOMATIC TRANSMISSION . . . . .
7-13
PART
7-1
GENERAL
TRANSMISSION
SERVICE
~ti~
h~
Diagnosis and Testing ..................... 7-1
2 Common Adjustments and Repairs ........... 7-8
3 Cleaning and Inspection ................... 7-8
D
DIAGNOSIS AND TESTING
The following preliminary checks
should be made on the transmission
before proceeding with any other
diagnosis checks.
TRANSMISSION FLUID
LEVEL CHECK
Check the transmission fluid level.
Low fluid level can affect the oper-
ation of the transmission,. and may
indicate fluid leaks that could cause
transmission damage.
A fluid level that is too high will
cause the fluid to become aerated.
Aerated fluid will cause a low control
pressure, and the aerated fluid may
be forced out the vent at the front of
the transmission case.
TRANSMISSION FLUID
LEAKAGE CHECKS
Check the speedometer cable con-
nection at the transmission for oil
leakage. Check the governor inspec-
tion plate for leakage. Install a new
gasket if needed. Leakage at the oil
pan gasket often can be stopped by
tightening the attaching bolts to the
proper torque.
If
necessary, replace
the gasket.
Check the fluid filler tube connec-
tion at the transmission. Check the
fluid lines and fittings between the
transmission and the cooler in the
radiator tank for leakage, looseness,
wear, or damage.
If
leakage cannot
be stopped by tightening a fitting, re-
place the leaking parts.
Check the engine coolant in the
radiator.
If
transmission fluid is
present in the coolant,
tht~
cooler in
the radiator tank is probably leaking.
The cooler can be further checked
for leaks by disconnecting the lines
at the cooler fittings and applying
5 psi air pressure to the fittings. If
the cooler is leaking and will not
hold this pressure, the radiator must
be replaced. The cooler cannot be
replaced separately.
If
leakage is found at either the
transmission throttle lever (kickdown
lever) shaft or the manual lever
shaft, replace either or both seals.
Inspect the pipe plugs in the
transmission case. If a plug shows
leakage, torque the plug to specifi-
cation. If tightening does not stop
the leak, replace the plug.
When converter drain plugs leak,
remove the two drain plugs with a
sixpoint wrench. Coat the threads
with FoMoCo Perfect Seal Sealing
Compound or its equivalent, and in-
stall the plugs. Torque the drain
plugs to specification. Fluid leakage
from the converter housing may be
caused by engine oil leaking past
the rear main hearing or from oil
gallery plugs, or power steering oil
leakage
from
the
steering
or
hydro-wipe system. Be sure to
determine the exact cause of the
leak before repair procedures are
started.
Oil-soluble aniline or fluorescent
dyes premixed at the rate of
1
h tea-
spoon of dye powder to
1
h pint of
transmission fluid have proved help-
ful in locating the source of the
fluid leakage. Such dyes may be used
to determine whether an engine oil
or transmission fluid 1eak is present,
or if the fluid in the oil cooler leaks
into the engine coolant system. A
black light, however, must be used
with the fluorescent dye solution.
CONVERTER AREA OIL LEAKAGE
In diagnosing and correcting fluid
leaks in the front pump and con-
verter area, the following procedures
are to be used to facilitate locating
the exact cause of oil leakage. Leak-
age at the front of the transmission, as
evidenced by oil around the con-
verter housing, may have several
sources. By careful observation, it
is possible, in many instances, to
pinpoint the source of the leak before
removing the transmission from the
car. The paths the fluid takes to reach
the bottom of the converter housing
are shown in Fig. 1. Figure 2 shows
the location of the hole in the front
of the case that can cause oil leakage
at the converter area, if the trans-
mission oil level is too high. Check
the oil lev.el first, then check the fol-
lowing items:
1. Fluid that leaks by the seal lip
will tend to move along the drive hub
and onto the back of the impeller
housing. Except in the case of a total
seal failure, fluid leakage by the lip
of the seal will be deposited on the
inside of the converter housing only,
near the outside diameter of the
housing (Fig.
1).
2. Fluid leakage by the outside
diameter of the seal and front pump
body will follow the same path as
shown in Fig. 1.
3. Fluid that leaks by a front pump
I
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