GMC 1976 ZEO 6083 Maintenance Manual page 82

Installation
Figure 31-Hose Clamp Connections
1 . Coat tube and hose with clean refrigeration oil.
2. Carefully insert hose over the three beads on
the fitting and down as far as the fourth, or locating
bead . Hose must butt against this fourth bead .
CAUTION :
Use no sealer of any kind.
3. Install clamps on hose, hooking the locating
arms over the cut end of the hose .
4. Tighten the hose clamp screw to 35-42 in . lbs.
torque . DO NOT RETORQUE . The clamp screw
torque will normally decrease as the hose conforms
to the force of the clamp. The screw should be retor-
qued only if its torque falls below 10 in . lbs. In this
case, retorque to 20-25 in . lbs . Further tightening
may damage the hose .
REPAIR OF REFRIGERANT LEAKS
Any refrigerant leaks found in the system should
be repaired in the manner given below:
LEAKS AT "0" RING CONNECTION
1 . Check the torque on the fitting and, if too
loose, tighten to the proper torque. Always use a
AIR CONDITIONING SYSTEM 1- 6 5
backing wrench to prevent twisting and damage to
the "O" ring . Do not overtighten. Again leak test the
joint.
2. If the leak is still present, discharge the refrig-
erant from the system as described under "Evacuat-
ing and Charging Procedures ."
3 . Inspect the "O" ring and the fitting and re-
place if damaged in any way. Coat the new "O" ring
with clean refrigeration oil and install carefully.
4. Retorque the fitting, using a backing wrench .
5 . Evacuate, charge and check the system .
LEAKS AT HOSE CLAMP CONNECTION
1 . Check the tightness of the clamp itself and
tighten if necessary. Recheck for leak .
2. If leak has not been corrected, discharge the
system and loosen clamp and remove hose from con-
nection . Inspect condition of hose and connector.
Replace scored or damaged parts.
3 . Dip end of new hose in clean refrigeration oil
and carefully reinstall over connector. Never push
end of hose beyond the locating bead . Properly
torque the clamp.
4. Evacuate, charge and check the system .
COMPRESSOR LEAKS
If leaks are located around the compressor shaft
seal or shell, replacement of necessary seals should be
made .
NOTE :
A slight amount of oil leakage past the
compressor front seal is considered normal .
REFRIGERANT HOSE FAILURE
After a leak or rupture has occurred in a refriger-
ant hose, or if a fitting has loosened and caused a
considerable loss of refrigerant and oil, the entire
system should be flushed and recharged after repairs
have been made .
Because of the length of the hoses on these sys-
tems, hose leaks may be repaired using the following
procedure:
1 . Locate the leak .
2. Discharge the system .
3 . Cut out the leaking portion of the hose, making