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7A4-42
1977 PONTIAC SERVICE MANUAL
plug (hole out) and install the grooved retaining pin from cast
surface side of the valve body, with the grooves entering the
pin hole last. Tap pin with hammer until flush with cast
surface.
NOTE: The OC model uses no 1-2 accumulator springs.
3. In next bore up, install detent spring and spacer,
compress spring and secure with small screwdriver (Fig. 7A4-
74), install detent regulator valve, wide land first, and install
detent valve, narrow land first. Install bore plug (hole out),
depress spring by pressing in on plug, install retaining pin and
remove screwdriver.
2648
:ig.
7A4-74
Installing Detent Regulator Valve and Detent
Valve
4. In lower right hand bore, install 3-2 valve, 3-2 valve
spring, spacer, bore plug (hole out) and retaining pin.
5. In next bore up, install 2-3 shift valve, open end out
and install 2-3 secondary spring into its open end. Install 2-3
modulator valve into its bushing, install both parts into valve
body bore and install 2-3 primary spring and its retaining pin.
6. In next bore up, install 1-2 valve, stem end out, install
the 1-2 regulator valve, larger stem first, spring and the 1-2
detent valve, hole end first, into the 1-2 modulator bushing,
aligning the spring into the bore of the detent valve and install
this assembly into the valve body bore. Compress bushing
against the spring and install the retaining pin.
7. Install manual valve with detent pin groove to the
right.
OIL PUMP
Disassemble
1. Place oil pump assembly in hole in bench or Fixture
J 61 16 and Adapter J 21364.
2. Compress regulator boost valve bushing against
pressure regulator spring and remove snap ring, using snap
ring pliers (Fig. 7A4-75).
3. Remove regulator boost valve bushing and valve.
4. Remove pressure regulator spring.
5. Remove spring retainer, spacer(s) if present and
regulator valve (Fig. 7A4-76).
REGULATOR BOOST VALVE
SNAP RING
BUSHING AND VALVE
-
J 5403
1
/
REGULATOR SPRING
Fig.
7A4-75
Removing Snap Ring Front Boost Valve
Bushing
I
-
PRESSURE REGULATOR
SPACER
Fig.
7A4-76
Removing Pressure Regulator Valve
6. Remove pump cover-to-body attaching bolts and
remove cover from pump body.
7. Remove retaining pin and bore plug from pressure
regulator bore (Fig. 7A4-77).
8. Check condition of oil seal rings and remove from
pump cover if necessary (Fig. 7A4-78).
9. Remove pump-to-forward clutch housing selective
washer.
10. Mark drive and driven gears for reassembly in same
position and remove gears from pump body (Fig. 7A4-79).
Inspect Oil Pump
NOTE: A solid type pressure regulator valve must only
be used in a pump cover with a squared off pressure
regulator boss (Fig. 7A4-80). A pressure regulator valve
with oil holes and orifice cup plug may be used to service
either type pump cover.
1. Inspect drive gear, driven gear, gear pocket and
crescent for scoring, galling or other damage.
2. Place pump gears in pump and check pump body
face-to-gear face clearance, should be .0008"-.0035" (Fig.
7A4-82).
3. Check face of pump body for scores or nicks.
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