Chevrolet 1977 Monte Carlo, Repair Manual

Page: 42 / 428

1D-36 AIR C O N D ITIO N IN G COMPRESSOR OVERHAUL
Figure 1D-95 Removing R-4 O-Ring (On Car)
Seal Seat and Seal are free o f lint and dirt that could damage
the seal surface or prevent sealing.
Replace (On Car)
1. Coat the new seal seat O-ring in clean 525 viscosity
refrigerant oil and assem ble on to O -R ing Installer J -2 1508
(see Figure ID -96).
2. Insert the O -R ing Installer J -2 1508
completely
down
into the com pressor neck until the Installer
"bottoms". Lower the m oveable slide o f the O-Ring
Installer to release the O -R ing into the seal seat O-ring
lower
groove. (T he com pressor neck top groove is for the
shaft seal retainer ring). R otate the Installer to seat the O-
ring and rem ove the Installer. (See Figure ID -2 4 .)
Figure 1D-97 Installing
R-4
Seal (On Car)
shaft and J-22974 Seal Protector and push the Seat into
place with a rotary m otion (Figure ID -98). Take care not
to dislodge the seat O-ring. H ow ever, be sure Seal Seat
makes a good seal with O-ring. R em ove Installer J-23128
and Seal Protector J-22974.
6. Install the new seal seat retainer ring
with its flat
side against the Seal Seat,
using Snap-R ing Pliers J-5403
( # 2 1 ) . See Figure ID -21. U se the sleeve from Seal Seat
R em over-Installer J-23128 to press in on the seal seat
retainer ring so that it snaps into its groove.
Figure 1D-96 Installing R-4 0-Ring (On Car)
3. C oat the O -R ing and seal face o f the new Seal
assem bly w ith clean 525 viscosity refrigerant oil. Carefully
m ount the Seal assem bly to Seal Installer J-9392 by engaging
the tabs o f the seal with the tangs o f the Installer (Figure
ID -97).
4. Place Seal Protector J-22974 over end o f com pressor
shaft and carefully slide the new Seal assembly onto the
shaft. G ently twist the Installer J-9392 C LO C K -W ISE,
w hile pushing the Seal assem bly down the shaft until the
Seal assembly engages the flats on the shaft and is seated
in place. D isengage the Installer by pressing downward and
tw isting counterclockw ise.
5. A ttach the ceram ic Seal Seat to the Seal Seat
R em over and Installer J-23128 and dip the ceram ic Seat in
clean 525 viscosity oil refrigerant to coat the seal face and
outer surface. Carefully install the Seat over the com pressor
Figure 1D-98 Installing R-4 Ceramic Seal Seat (On Car)
7. For Leak Test, pressurize S U C T IO N S ID E (low-
pressure side) o f com pressor on vehicle with R efrigerant-12
vapor to equalize pressure to the drum pressure.
Tem porarily install the shaft nut and, with com pressor in
horizontal position, rotate the com pressor shaft in normal
direction o f rotation several tim es by hand. Leak test the
Seal. Correct any
leak found. R em ove, discard and later replace the shaft nut.
8. R em ove any excess oil, resulting from installing the
new seal parts, from the shaft and inside the com pressor
neck.
9. Install the Clutch Plate and H ub assem bly as
described in "R-4 Com pressor C lutch Plate and Hub
A ssembly" R eplacem ent procedure.
C E R A M I C
SEAL
SEAT
j