Pontiac tempest 1968 Service Manual page 512

T W O SPEED A U T O M A T I C TRANSMISSION
7F-11
F i g . 7F-21 Removing Shift Control V a l v e Sleeve
HIGH SPEED
J % ^ ^ ^ ^ ^
DOWNSHIFT *
TIMING VALVE ^
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WASHER
SPRING
RETAINING PIN
F i g . 7F-23 High Speed Downshift Timing Valve
2. Install modulator limit valve and spring (Fig.
7F-22). Depress spring with needle-nose pliers and
install retaining pin.
NOTE: Modulator limit valve spring is under
moderate pressure. Care should be exercised
during removal during step 3 below
0
3. Depress modulator limit valve spring and turn
valve body over so that retaining pin falls free
0
Re­
move spring and valve (Fig. 7F-22). (Needle nose
pliers can be used to depress spring and work out
pin.)
4. Depress high-speed downshift timing valve
spring and remove retaining pin by turning valve
body over so that pin can fall free. Remove springs,
washer and valve (Fig. 7F-23). (Needle-nose pliers
can be used to depress spring and work out pin.)
INSPECTION
As most valve body failures are initially caused
by dirt or other foreign material, a thorough cleaning
of all parts in clean solvent is mandatory. Check all
valves and their operating bores for burrs or other
deformities that could cause valve "hang-up".
ASSEMBLY
1. Install high-speed downshift timing valve, wash­
er and springs (Fig. 7F-23). Depress spring with
needle-nose pliers and install retaining pin.
MODULATOR LIMIT VALVE
-RETAINING PIN
3. Install spring and shift control valve into sleeve
(Fig. 7F-24). Depress spring and valve and insert
retainer in groove. Install shift valve and sleeve as­
sembly in valve body and install retaining pin.
4. Install detent valve and spring. Install gasket
on downshift solenoid with notch facing bottom of
valve body and install downshift solenoid (Fig.
7F-20). Tighten bolts to 10 lb. ft. torque.
INSTALLATION
1. Install new valve body plate to case gasket, us­
ing petrolatum to hold it in position. Install valve
body plate and oil channel support plate. Install
bolts finger tight.
2. Install manual control valve and link into valve
body.
3. Engage manual control valve link in park lock
and range selector inner lever (Fig. 7F-19).
4. Install detent spring assembly on valve body
(Fig. 7F-25). (Note routing of solenoid wire and wire
retaining clip position.)
5. Install remaining valve body to case bolts (ex­
cept oil strainer retaining bolt) and tighten all bolts
to 10 lb
0
ft. torque.
INSTALL RETAINER
IN THIS G R O O V E
SHIFT VALVE
RETAINING PIN SHIFT CONTROL VALVE
F i g . 7 F - 2 2 Modulator Limit V a l v e F i g . 7 F - 2 4 Shift V a l v e and Shift Control Valve