Pontiac FIREBIRD 1972 Service Manual page 901

TURBO HYDRA-MATIC (M-40) TRANSMISSION 7E-11
8. Vent pipe (refer to OIL COMES OUT VENT PIPE MODULATOR ASSEMBLY
below).
Diaphragm defective (transmission oil may be lost
9. Porous case* or cracked at pressure plug boss. through the diaphragm and be burned in the engine).
FRONT E N D
'CASE POROSITY REPAIR
Front seal damaged (check converter neck for nicks,
etc., also for pump bushing moved forward); garter
spring missing from pump-to-converter hub oil seal.
Pump attaching bolts and seals damaged, missing,
bolts loose.
Converter
-
leak in weld.
Pump O-ring seal damaged (also check pump oil ring
groove and case bore).
Porous casting (pump or case)*.
Pump
-
drain back hole restricted.
OIL COMES OUT VENT PIPE
Transmission over-filled.
Water in oil.
Pump-to-case gasket mispositioned.
Foreign material between pump and case, or between
pump cover and body.
Case porous*, pump face improperly machined
Pump shy of stock on mounting faces, porous casting.
Incorrect dipstick.
Cut O-ring or grommet on filter.
Breather hole in pump cover blocked or missing.
Hole in intake pipe.
OIL COOLER LINES
Turbo Hydra-Matic transmission leaks caused by CASE
POROSITY (not cracks) may be repaired with the trans-
mission 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.
2. Raise car on hoist or jack stand, engine running with
rear wheels free to turn and locate source of oil leak.
Check for leaks with transmission in "LOW" and
"SUPER" ranges.
NOTE: Use of a mirror is helpful in locating leaks.
3. Shut engine off and thoroughly clean area to be re-
paired with cleaning solvent and a brush, then air
NOTE: A clean, dry soldering acid brush may
be used to clean the area and also to apply the
epoxy cement.
4. Following the instructions of the manufacturer, mix
a sufficient amount of epoxy cement, 3M-SCOTCH
WELD-2216 (preferred), Part No. 1360016 (Z), Grp.
No. 0.423 (alternate) or equivalent to make the re-
pair.
NOTE: Observe manufacturer's cautions in
handling.
5. While transmission case is still hot, apply epoxy ce-
ment to the area to be repaired. Be sure the area to
be repaired is completely covered.
6. If 3M-SCOTCH WELD-2216 epoxy is used, allow
ONE (1) hour to cure before starting engine. If
1360016 (Z) epoxy is used, allow THREE (3) hours
to cure before starting engine.
1. Connections at radiator loose or stripped.
7. Road test car to bring transmission fluid to operating
temperature of 180°F and re-check transmission for
2. Connections at transmission case loose or stripped. leaks.
GENERAL DESCRIPTION
The Turbo Hydra-Matic transmission is a fully automatic and two bands provide the friction elements required to
unit consisting primarily of a 3-element hydraulic torque obtain the desired function of the compound planetary
converter and a compound planetary gear set (Fig. 7E-4). gear set.
Three multiple-disc clutches, one sprag, one roller clutch