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PART 7-3· F.
M.X. AUTOMATIC TRANSMISSION
7-83
observation, it is possible, in many
instances, to pinpoint the source of
the leak before removing the trans-
mission from the vehicle. The paths
which the fluid. takes to reach the bot-
tom of the converter housing are
shown in Fig.
I.
I. Fluid leaking by the front pump
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.
2. Fluid leakage by the outside
diameter of the seal and front pump
body will follow the same path which
leaks by the front pump seal.
3. Fluid that leaks by a front pump
to
case
bolt will be deposited on the
inside of the converter housing only.
Fluid will not be deposited on the
back of the
converter.
4. Leakage by the front pump to
case gasket may cause fluid to be
deposited inside the converter hous-
ing, or it may seep down between the
front of the case and converter hous-
ing.
Fluid on the front of the case
above the pan gasket is evirlence that
the front pump to case gasket or seal
could be leaking.
S. Fluid leakage from the convert-
er drain plugs will appear at the out-
side diameter of the converter on the
back face of the flywheel, and in the
converter housing only near the fly-
wheel.
Engine oil leaks are sometimes im-
properly diagnosed as transmission
front pump seal leaks. The following
areas of possible leakage should also
be checked to determine if engine oil
leakage is causing the problem
.
1.
Leakage
at
the rocker arm cover
(valley cover) may allow oil to flow
over the converter housing or seep
down between the converter housing
and cylinder block causing oil to be
present in or at the bottom of the
converter
housing.
2. Oil galley plug leaks will allow
oil to flow down the rear face of the
block to the bottom of the converter
housing.
3. Leakage by the crankshaft seal
will work back to the flywheel, and
then into the converter housing.
Fluid leakage from other areas,
such as the power steering system
forward of the transmission, could
cause fluid to be present around the
converter housing due to blow back
Til
[
I
CR~~ ~[
~I
FRONT PUMP SEAL LEAK
CONVERTER DRAIN PLUG
LEAK
0 1311·8
FIG. 1-Typical Convertor Area
Leakage Checks
or
road draft.
The following procedures should
be used
to determine
the cause of the
leakage before any repairs are
made.
1.
Remove the transmission dip-
stick and note the color of the fluid.
Original
factory fill fluid is dyed red
to aid in
determining
if leakage is
from the engine or
transmission.
Un-
less a considerable amount of make-
up fluid has been added or the fluid
has been changed, the red color
should assist in pinpointing the leak.
Fluid used in the power steering sys-
tem
is
a
red
dye. Since
road draft may cause leaking power
steering fluid to be pr-·:sent on the
transmission, this
leakage,
if present,
should be eliminated before checking
the transmission for
fluid
leakage.
2.
Remove
the converter
housing
cover. Clean off any fluid from the
top and bottom of the converter
housing, front of the transmission
case, and rear face of the engine and
engine oil pan
.
Clean the converter
area by washing with carbon tetra-
chloride or other
suitable
non-flam-
mable solvent, and blow dry with
compressed air
.
3. Wash out the converter hous-
ing, the front of the flywheel, and
the converter drain plugs. The con-
verter housing may be washed out
using cleaning solvent
and
a squirt-
type oil can. Blow all washed areas
dry with compressed air.
4. Start and run the engine until
the transmission reaches iis normal
operating temperature
.
Observe the
back of the block and top of the con-
verter housing for evidence of fluid
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