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7A1-72
1 9 7 7 PONTIAC SERVICE M A N U A L
6. From next bore down, remove coiled pin. Remove 1-2
throttle valve bushing, 1-2 throttle valve spring, 1-2 throttle
valve and 1-2 shift valve.
NOTE: The 1-2 throttle valve spring and the 1-2 throttle
valve may be inside the 1-2 throttle valve bushing.
7. From next bore down, remove coiled pin and bore
plug. Remove reverse boost spring and reverse boost valve.
8. Check the operation of the shift T.V. valve in the next
bore down, by moving the valve against the spring. If it is
necessary to remove the valve, proceed as follows:
a. Remove coiled pin and place valve body on shop towel
with rough casting surface up.
b. Using needle nose pliers, compress the shift T.V.
spring by pushing on the shift T.V. valve; hold valve with
small screwdriver (Fig. 7A 1- 175).
PLUG
9.5 MM (318") LONG
1
Fig.
7A1-176
Removing Shift
T.V.
Bore Plug
Fig.
7A1-177
Removing Inner Coiled Pin
Fig.
7A1-175
Compressing Shift
T.V.
Spring
Inspection
c. Place 6.3mm (1/4") rod, 9.5mm (3/8") long, against
the end of the shift T.V. valve.
d. Prying on end of the rod with a large screwdriver,
remove small screwdriver and remove shift T.V. bore plug,
shift T.V. spring and shift T.V. valve (Fig. 7Al-176).
e. Discard shift T.V. plug and remove 6.3mm (1/4") rod
from shift T.V. bore.
9. From next bore down, remove outer coiled pin.
Remove the throttle valve plunger and bushing, throttle valve
spring and detent pin. Using a 1.5,, (1/16") allen wrench with
ground sides to fit inside the pin, remove the inner coiled pin
(Fig. 7A 1-1 77). Remove the throttle valve.
NOTE: The detent pin is used only on BR, CN, CU, CX
and C Z models. All other models do not use a detent
pin.
10. From upper left bore, remove coiled pin,
intermediate boost spring and intermediate boost valve.
11. From next bore down, remove coiled pin, low
overrun clutch spring and low overrun clutch valve.
12. From next bore down, remove coiled pin, direct
clutch exhaust spring and direct clutch exhaust valve.
13. From next bore down, remove coiled pin, 1-2
accumulator bore plug, 1-2 accumulator valve and 1-2
accumulator valve spring.
1. Wash control valve body, valves, springs and other
parts in clean solvent and air dry.
2. Inspect 1-2 accumulator piston for damage.
3. Inspect 1-2 accumulator piston seal for danlagc and
free fitting groove. Do not remove seal unless replacing.
4. Inspect valve for scoring, cracks and free movement
in their bores.
5. Inspect bushings for cracks or scored bores.
6. Inspect valve body for cracks, damage or scored bores.
7. Inspect springs for distortion or collapsed coils.
8. Inspect bore plugs for damage.
Reassembly (Fig. 7A1-174)
NOTE: Install all coiled pins from machined face side
except the coil pin retaining the throttle valve bushing,
plunger, spring and detent pin. Install this coil pin from
rough casting side. Coiled pins do not fit flush on rough
casting face.
1. Position control valve body as shown in Fig. 7A1-174.
2. Install into lower left bore,l-2 accumulator valve
spring and 1-2 accumulator valve, smaller stem end out.
Install bore plug, hole out, and coiled pin.
3. In next bore up, install direct clutch exhaust valve,
longer stem end out, direct clutch exhaust spring and coiled
pin.
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