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7-38
GROUP 7-AUTOMATIC TRANSMISSION
FLUID LEAKAGE
CONVERTER AREA
In diagnosing and correcting fluid
leaks in the front pump and con-
verter area, use the following pro-
cedures to facilitate locating the
exact cause of the leakage. Leakage
at the front of the transmission, as
evidenced by fluid 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 which the
fluid takes to reach the bottom of
the converter housing are shown in
Fig. I.
1. Fluid leaking by the front
pump seal lip will tend to move
CONVERTER DRAIN
PLUG LEAK
CONVERTER
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 as
leaks by the front pump seal or may
run down the face of the front
pump.
3. Fluid that leaks by a front
pump and converter housing to case
bolts 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
D1513-A
FIG. 1
- Typical Converter
Area
leakage Checks
case and 0-ring seal may cause
fluid to be deposited on the outside
lower part of the converter housing
as shown in Fig. I.
5. Fluid leakage from the con-
verter drain plugs will appear at the
outside diameter of the converter.
Engine oil leaks are
sometimes
improperly diagnosed as front pump
seal leaks. The following areas of
possible leakage
should
also be
checked to determine
if
engine oil
leakage is causing the problem
:
(a)
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.
(b)
Oil gallery plug leaks will al-
low oil to flow down the rear face
of the block to the bottom of the
converter housing.
(c)
Leakage by the crankshaft
seal will work back to the flywheel,
and then into the converter
housing.
Fluid leakage from other areas,
forward of the transmission could
cause fluid to be present around the
converter housing due to blow-back
or road draft.
The following procedure should
be used to determine the cause of
leakage before any repairs are made
:
(a)
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.
Unless 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.
Since road draft may cause leak-
ing valley cover oil to be present on
the transmission, this leakage, if
present, should be eliminated before
performing work on the trans-
mission.
(b) Remove the converter lower
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
suitable non-flammable solvent, and
blow dry with compressed air.
(c)
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.
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