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TURBO HYDRA-MATIC 4 0 0 AUTOMATIC TRANSMISSION
7A4-17
M. REPLACE INTERMEDIATE CLUTCH PISTON
SEALS.
NOTE: IF DIRECT CLUTCH PLATES AND
FRONT BAND ARE BURNED, CHECK MANUAL
LINKAGE
FOR
CORRECT
ADJUSTMENT.
BURNED CLUTCH PLATES CAN BE CAUSED BY
INCORRECT USAGE OF CLUTCH PLATES.
ALSO, ANTI-FREEZE IN TRANSMISSION FLUID
CAN CAUSE SEVERE DAMAGE, SUCH AS
LARGE PIECES OF COMPOSITION CLUTCH
PLATE MATERIAL PEELING OFF.
OIL LEAKS
Before attempting to correct an oil leak, the actual
source of the leak must be determined. In many cases, the
source of the leak can be deceiving due to wind flow around
the engine and transmission.
The suspected area should be wiped clean of all oil before
inspecting for the source of the leak. Red dye is used in the
transmission oil at the assembly plant and will indicate if the
oil leak is from the transmission.
The use of a black light to identify the oil at the source
of leak is also helpful. Comparing the oil from the leak to that
on the engine or transmission dipstick (when viewed by black
light) will determine the source of the leak.
Oil leaks around the engine and transmission are
generally carried toward the rear of the car by the air stream.
For example, a transmission oil filler tube-to-case leak will
sometimes appear as a leak at the rear of the transmission.
In determining the source of an oil leak, it is most helpful to
keep the engine running.
1. TRANSMISSION OIL PAN LEAKS
A. ATTACHING BOLTS NOT CORRECTLY
TORQUED.
B. IMPROPERLY INSTALLED OR DAMAGED
PAN GASKET.
C. OIL PAN GASKET MOUNTING FACE NOT
FLAT.
2. CASE EXTENSION LEAK
A. ATTACHING BOLTS NOT CORRECTLY
TORQUED.
B. IF THE REAR SEAL IS SUSPECTED:
CHECK SEAL FOR DAMAGE OR IMPROPERLY
INSTALLED.
CHECK SLIP YOKE FOR DAMAGE.
C. EXTENSION-TO-CASE GASKET OR SEAL
DAMAGED OR IMPROPERLY INSTALLED.
3. CASE LEAK
A. FILLER PIPE " 0 RING SEAL DAMAGED OR
MISSING: MISPOSITION OF FILLER PIPE BRACKET
TO ENGINE "LOADING" ONE SIDE OF THE "0"
RING. FILL PIPE CRACKED, OR MALFORMED "0"
RING GROOVE.
B. MODULATOR ASSEMBLY "0" RING SEAL
-
DAMAGED OR IMPROPERLY INSTALLED.
C. ELECTRICAL CONNECTOR " 0 " RING SEAL
DAMAGED OR IMPROPERLY INSTALLED.
D. GOVERNOR COVER, GASKET AND BOLTS
-
DAMAGED, LOOSE: CASE FACE DAMAGED OR
POROSITY.
E. LEAK AT SPEEDOMETER DRIVEN GEAR
HOUSING OR SEAL. LEAK AT SPEED0 HOLE PLUG.
F.
MANUAL
SHAFT SEAL
-
DAMAGED,
IMPROPERLY INSTALLED.
G. LINE PRESSURE TAP PLUG
-
STRIPPED, SHY
SEALER COMPOUND.
H. VENT PIPE (REFER TO ITEM 5).
I. POROUS CASE OR CRACKED AT PRESSURE
PLUG BOSS.
4. FRONT END LEAK
A.
FRONT
SEAL
-
DAMAGED
(CHECK
CONVERTER NECK FOR NICKS, ETC., ALSO FOR
PUMP BUSHING MOVED FORWARD), GARTER
SPRING MISSING.
B. PUMP ATTACHING BOLTS LOOSE: SEAL
WASHERS DAMAGED.
C. CONVERTER LEAK AT WELDS.
D. LARGE "0" RING PUMP SEAL DAMAGED
-
ALSO CHECK CASE BORE.
E. POROUS CASTING (PUMP OR CASE).
F. PUMP DRAINBACK HOLE NOT OPEN (SEE
FIG. 7A4-83 FOR LOCATION OF SEAL DRAIN BACK
HOLE).
5. OIL COMES OUT VENT PIPE
A. TRANSMISSION OVER-FILLED.
B. WATER IN OIL.
C.
FILTER
" 0 RING
DAMAGED
OR
IMPROPERLY ASSEMBLED, CAUSING OIL TO
FOAM.
D. FOREIGN MATERIAL BETWEEN PUMP AND
CASE OR BETWEEN PUMP COVER AND BODY.
E. CASE
-
POROUS, PUMP FACE IMPROPERLY
MACHINED.
F. PUMP
-
SHY OF STOCK, POROUS.
G. PUMP TO CASE GASKET MISPOSITIONED.
H. PUMP BREATHER HOLE BLOCKED OR
MISSING (SEE FIG. 7A4-84 FOR LOCATION OF
BREATHER HOLE).
I. HOLE IN INTAKE PIPE.
J. CHECK BALL IN FORWARD CLUTCH
HOUSING STUCK OPEN OR MISSING.
K.
INSPECT
TURBINE
SHAFT
BUSHING
JOURNALS AND STATOR SHAFT BUSHINGS FOR
SCORING OR OTHER DISTRESS.
6. OIL COOLER LINES
A. CONNECTIONS AT RADIATOR LOOSE OR
STRIPPED.
B.
CONNECTIONS
AT
CASE
LOOSE OR
STRIPPED.
7. MODULATOR ASSY.
A. VACUUM DIAPHRAGM LEAKING.
CASE POROSITY REPAIR
Turbo Hydra-Matic transmission leaks caused by CASE
POROSITY (not cracks) may be repaired with the
transmission in the car by using epoxy cement and following
this recommended procedure:
1. Road test car to bring transmission fluid to operating
temperature, approximately 180°F.
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