Pontiac FIREBIRD 1972 Service Manual page 897

TURBO HYDRA-MATIC (M-40) TRANSMISSION 7E-7
SLlPS IN ALL RANGES, SLIPS ON START
-
(INSTALL PRESSURE GAUGE)
Low fluid level.
Oil pressure
-
refer to LOW LINE PRESSURE
above.
Case
-
cross leaks, porosity.
Forward and direct clutches slipping (if burnt, see
BURNED CLUTCH PLATE below); oil seal rings
on pump cover broken or worn.
SLIPS 1-2 SHIFT
-
(INSTALL PRESSURE
GAUGE)
Low fluid level.
Oil pressure
-
refer to LOW LINE PRESSURE
above.
Front accumulator piston oil ring damaged or miss:
ing.
Control valve:
(.020 dia.) blocked, center support bolt not seated
properly in case.
ROUGH 1-2 SHIFT
-
(INSTALL
PRESSURE
GAUGE)
1. Oil pressure
-
refer to HIGH LINE PRESSURE
above.
2. Control valve:
a. 1-2 accumulator valve trdn
b. Valve body-to-case bolts loose.
c. Wrong gaskets or off location, damaged.
3. Case:
a. Intermediate clutch ball missing or not sealing.
b. Porosity between channels.
4. Rear servo accumulator:
a. Oil rings damaged.
b. Piston stuck.
a. 1-2 accumulator valve train sticking.
b. Porosity in valve body or case.
c. Broken or missing spring.
d. Bore damaged.
c. Valve body attaching bolts not properly torqued.
5. Intermediate clutch
-
clutch plates burnt (see
BURNED CLUTCH PLATES below).
Rear accumulator oil ring missing or damaged; case
bore damaged.
Pump-to-case gasket mispositioned.
Case:
a. Intermediate clutch cup plug leaks excessively.
b. Porosity between channels.
c. Raised ridge around case center support bolt
(does not allow control valve assembly to seat
properly).
Intermediate clutch:
Piston seals missing or damaged; clutch plates
burnt (see BURNED CLUTCH PLATES be-
low).
Center support
-
leak in feed circuit (oil rings
damaged or grooves defective), excessive leak be-
tween tower and bushing, orifice bleed plug hole
SLIPS 2-3 SHIFT
-
(INSTALL PRESSURE
GAUGE)
1. Low fluid level.
2. Oil pressure
-
refer to LOW LINE PRESSURE
above.
3. Control valve
-
accumulator piston pin (leak at
swedge end).
4. Case porosity.
5. Direct clutch:
a. Piston seals leaking or ball check leaks.
b. Center support oil seal rings damaged; excessive
leak between tower and bushing.