Chevrolet 1977 10 Series, Repair Manual, Page: 342 / 468

(400)7A-22 OVERHAUL MANUAL
retaining pin.
10. In next bore up, install the 2-3 shift valve, open end
out, into the bore and install 3-2 interm ediate spring.
11. Install 2-3 m odulator valve into bushing and install
both parts into valve body bore.
12. Install 2-3 valve spring and retaining pin.
13. In next bore up, install 1-2 valve, stem end out.
14. Install parts as follows:
a. (Models CG, CJ and CP) Install the 1-2 valve spring
and 1-2 m odulator valve into the 1-2 m odulator bushing,
aligning the spring in the bore of the m odulator valve. Install
parts into the valve body bore.
b. (All other models) Install the 1-2 regulator valve,
regulator spring and 1-2 detent valve open hole first into the
1-2 m odulator bushing, aligning the spring in the bore of the
detent valve.
15. Compress bushing against spring and install
retaining pin.
16. Install m anual valve with detent pin groove to the
right.
Oil Pump Disassembly, Inspection and Assembly
Disassembly
1. Place oil pump assembly in hole in bench or holding
fixture, J-6116 with J-2 1364 adapter.
2. Compress regulator boost valve bushing against
pressure regulator spring and remove snap ring, using J-5403
pliers (Fig. 7A-69C).
3. Remove regulator boost valve bushing and valve.
4. Remove pressure regulator spring.
5. Remove regulator valve, spring retainer and spacer(s),
if present (Fig. 7A-70C).
6. Remove pum p cover to body attaching bolts.
7. Remove pum p cover from body.
8. Remove retaining pin and bore plug from pressure
regulator bore (Fig. 7A-71C).
9. Remove hook type oil rings from pump cover.
Fig. 7 A-73C--P re ssu re R e g u la to r V a lv e I d e n t if ic a t io n
10. Remove pum p to forward clutch housing selective
washer.
11. M ark drive and driven gears for reassembly in same
position and remove from the pum p body. See Fig. 7A-72C.
Inspection of Pump Body and Pump Cover
NOTE:
A solid type pressure regulator valve must only
be used in a pum p cover with a squared off pressure
regulator boss. See Fig. 7A-73C. A pressure regulator
valve with oil holes and orifice cup plug may be used
to service either type pum p cover.
1. Inspect drive and driven gear pocket and crescent for
PUMP COVER
FOR ID E N T IF IC A T IO N -
SQUARED OFF PRESSURE
REG. BOSS.
PUMP
DRIVEN
GEAR
PUMP DRIVE GEAR
(T A N G S UP)
PUMP
BOD Y
Fig. 7A-72C--lnstalling Pump Drive Gear
Fig. 7A -74C -Checking Pump Body Face to Gear Face
Clearance