GMC T Series 1994 Repair Manual page 37

Fig. 28 Removing and Installing Shaft Seal Seat
Retaining Ring
2. Insert the O-Ring Installer J 33011 com pletely dow n into
the com pressor neck until the Installer "bottom s". Low er
the m oveable slide of the O -R ing Installer to release the
O -ring. into the seal seat 0 -rin g low er groove. (The
com pressor neck top groove is for the shaft seal retainer
ring.) Rotate the Installer to seat the O -rin g and rem ove
the Installer.
3. Prepare Lip Seal:
• A ssem ble Lip Seal to Seal Installer, J 231 2 8 -A ,
(Fig. 27). The printed/stam ped steel case side of
Lip Seal m ust be engaged with knurled tangs o f
installer so that flared -out side o f Lip Seal is
facing and installed tow ards the com pressor.
4. Install Lip Seal:
• Place Seal Protector J 34614 over end
com pressor shaft and slide new seal onto the shaft
until it stops (Fig 27). D isengage installer from
seal and rem ove seal protector from com pressor
shaft.
NOTICE:
Handling and care of seal protector is
im portant. If seal protector is nicked or the bottom
flared, the new seal may be dam aged during installation.
5. Install the new seal seat retainer ring with its flat side
against the Seal Seat, using Snap-Ring Pliers J 5403 (Fig
28). Use the sleeve from O-Ring Installer J 33011 to press
in on the seal seat retainer ring so that it snaps into its
groove.
6. E vacuate and charge system sith 1 lb. refrigerant.
Tem porarily install the
com pressor in horezontal position, rotate the com pressor
shaft in normal direction o f rotation several times. Leak
test the seal. R ecover refrigerant and repair as necessary.
Rem ove, discard and later replace the shaft nut.
7. Rem ove any excess oil, resulting from installing the new
seal parts, from the shaft and inside the com pressor neck.
8. Install the Clutch Plate and Hub assem bly as described in
m inor repair procedures.
9. Reinstall com pressor belt and tighten bracketry.
10. Evacuate and Charge the R efrigerant System.
of
shaft nut and, w ith the
1 -L E A K TEST
ADAPTER
J 9625-A
2 -H IG H
PRESSURE
C U T O F F
SWITCH
NO TICE: HIG H
PRESSURE
CUT-OFF
SWITCH
INSULATO RS
ARE CO LORED
RED
Fig. 29 Compressor Leak Testing Fixture
Off-Vehicle
Install or Connect
Follow applicable on-vehicle procedures.
To leak test, install com pressor leak test fixture J 9 6 2 5 -A
on rear head of com pressor and connect gage charging
lines and J 38100-B R efrigerant R ecovery System .
Pressurize suction and high-side o f com pressor with
R efrig eran t-12 vapor to drum pressure. Tem porarily
install (M9 x 1.25 thread on shaft) nut and, with the
compressor in horizontal position, rotate the com pressor
shaft in normal direction o f rotation several turns by
hand. Leak test the seal area and correct any leak found.
Recover the refrigerant. Rem ove shaft nut.
COMPRESSOR PRESSURE RELIEF VALVE
The Pressure R elief Valve, located in the com pressor rear
head casting (Fig. 4). should only be replaced after recovering
refrigerant. A new valve and O-ring coated with 525 viscosity
refrigerant oil should be installed.
COMPRESSOR CONTROL SWITCHES
Remove or Disconnect
Recover the refrigerant.
Disconnect the electrical connector from the sw itch in
the rear head of the com pressor.
Remove the switch retaining ring (Fig. 30) using
J 5403 internal snap ring pliers.
Remove switch from com pressor by pulling on term inal
housing.
Remove old O-ring seal from sw itch cavity using
J 9553-01 O-ring rem oval tool or equivalent.
If switch will be reinstalled in com pressor, a new O -ring
seal must be used and preferably a new retainer ring
should also he used. A new sw itch kit has the O -ring and
retainer ring included.