Table of Contents
Advertisement
3D-30
1977 PONTIAC SERVICE MANUAL
Dig. 3D-37 Removing Diaphragm Retainer
Fig. 3D-38 Distributor Valve Assembly
2. Remove two arm assembly stop bushings and two
distributor valve stop bushings.
3. Remove distributor valve, being careful not to distort
valve tension spring.
4. Carefully remove valve tension spring from boss. Do
not distort spring.
NOTE: Tension spring has one short foot and one long
foot. The short foot fits under the distributor valve and
the long foot fits into a hole drilled at an angle in the
boss (See Fig. 3D-39).
5. Remove intake check valve retaining spring, intake
check valve and washer, using a pocket.
6. If necessary, remove rocker and swivel arms. Grip pin
with pliers and remove pin (Fig. 3D-40).
Fig. 3D-39 Installing Valve Tension Spring in Boss
Fig. 3D-40 Removing Rocker Arm Pin
SECOND STAGE HOUSING
Disassemble
Remove check valve from second stage housing as
follows:
1. Support housing casting in a vise.
2.
Carefully drive check valve assembly out of casting
using a short piece of 5/16" drill rod (Fig. 3D-41).
3. Remove and discard the "0" ring.
CLEAN AND INSPECT PARTS
All metal parts should be cleaned in clean solvent and
blown dry with compressed air.
PISTON AND DIAPHRAGM ASSEMBLY
1. Inspect piston for scoring. Replace if necessary.
2. Inspect check valve seat. Seat should be smooth and
clean.
3. Inspect diaphragm for holes, looseness or other
defects. Replace if necessary.
FIRST
STAGE
HOUSING
AND
VALVE
MECHANISM
Advertisement
Table of Contents
