Cadillac 60 Series 1963 Shop Manual page 434

HEATING AND AIR CONDITIONING
13-53
Internal Spring
Spring Cage
Valve Spring-
Diaphragm,
Body Cavity,
Valve Body
Vacuum
Power Unit
Flat Washer
Jam Nut
. Valve Cover
Spring Retainer Cup
Evaporator
Cage Valve
Core
Outlet to
Compressor]
Equalizer
Line
Screen
cetainer
Oil Bleed Line
Valve Core
Inlet From
Evaporator
Fig. 13-75 Suction Throttling Valve Cross Section View
7. Remove spring retainer cup from diaphragm.
8. Remove diaphragm and piston assembly from
valve body.
9. Carefully remove diaphragm from piston.
Pull on diaphragm, stretching tab until it is re-
leased from piston.
CAUTION: Use care when handling dia-
phragm to prevent damage to rubber and fabric
surfaces. Examine diaphragm for cuts and
tears, if damaged it must be replaced.
10. Screen and retainer should not be removed
from piston. Examine screen for any foreign
material or contamination, and clean with tri-
chlorethylene or alcohol.
11. If necessary, valve cores may be removed
from oil bleed line and evaporator gage connector
ports.
b. Cleaning Valve Body
1. Thoroughly clean valve body with trichlor-
ethylene or alcohol.
2. All solvent should be removed from valve
body prior to assembly.
3. Blow "all gas passages in valve body dry with
refrigerant gas.
4. Clean internal metal parts with trichlor-
ethylene or alcohol and remove solvent prior to
assembly.
c. Assembly
1. Examine valve body bore surfaces for any
imperfections, foreign material, and any obvious
damage that would cause piston not to operate
freely. Replace valve body if bores are damaged
or if any cross threading, or damage has been
sustained around connector ports.
NOTE: Do not attempt to scrape, stone or
dress-out any damage as it may result in im-
proper performance of valve.
2. Install valve cores in connector ports, if
previously removed. Install valve core with plain
tip in evaporator gage connector port, and valve
with black tip in oil bleed line connector port. The
valves open at different pressures and, if improp-
erly installed, would affect operation of system.
3. Examine exterior surface of piston for
scratches or nicks that could cause piston to bind
in bore. Replace piston if damaged.
NOTE: Do not attempt to dress-out any
damaged areas on piston surface as close toler-
ance is required in the fitting of the piston for
proper operation.
4. Apply a light coat of 525 refrigerant oil on
diaphragm tab and install diaphragm on piston by
inserting tab in hole on top of piston and pressing
downward with a rotating motion until tab is prop-
erly seated.
5. Apply a light coat of 525 refrigerant oil to
exterior surface of piston and install piston in
valve body.
6. Install spring retainer cup in diaphragm.
7. Position valve cover on valve body, making
certain that screw holes in cover, diaphragm, and
body line up. Start the five screws into body but
do not tighten.
8. Insert finger through inlet opening at hex end
of valve body, and carefully press piston upward
into cover to properly position diaphragm so that
it does not become pinched under cover flange.
9. Press down on spring retainer cup until
piston seats against inner shoulder of valve body.
Hold cup, diaphragm, and piston down and tighten
five cover screws securely.
10. Install a new O-ring on vacuum unit, ap-
plying a light coat of 525 refrigerant oil to O-ring
prior to installation.
11. Install flat washer and spacer if present in
bore in vacuum head.
12. Install valve spring against flat washer in
vacuum head bore.