Pontiac FIREBIRD 1972 Service Manual page 946

TURBO HYDRA-MATIC (M-40) TRANSMISSION 7E-57
RETAINING]
"E" RING
SERVO PISTON
\
I
ACCUMULATOR PISTON
SERVO SPRING
SERVO OIL SEAL
SPRING RETAINER
Fig. 7E-98 Exploded View of Rear Servo
quires replacement, use the aluminum oil seal nng
Group No. 4.242, Part No. 8623671.
The large diameter ring groove in the accummulator
piston is machined shallower in order to accept the
tenon outer (large diameter) oil seal ring. I f this ring
requires replacement, use on1
y
the tenon oil seal nng,
Group No. 4.242, Part No. 86271 53.
ASSEMBLE
1 . Install spring retainer, spring and washer on band
apply pin.
2. Install band apply (servo) pin, retainer, spring and
washer into bore of servo piston and secure with
E-ring.
3. Install oil seal on servo piston, if removed.
4. Install outer and inner oil rings on accumulator pis-
ton, if removed, and assembly into bore of servo pis-
ton.
CONTROL VALVE ASSEMBLY
DISASSEMBLE
1 . Position control valve assembly with cored face up
and accumulator pocket toward operator.
2. Remove manual valve from upper bore.
3. Install Special Tool J 21885 on accumulator piston
valve and remove retaining ring (Fig. 7E-99).
Fig. 7E-99 Compressing Accumulator Piston and Spring