HEATER AND AIR CONDITIONING 1A-23
1. Remove the compressor.
2. Remove the receiver-dehydrator and discard the
unit.
3. Flush the condenser to remove foreign material
which has been pumped into it.
4. Disconnect the line from the receiver-dehydrator
at the inlet connection of the expansion valve. Inspect
the inlet screen for the presence of metal chips
or other foreign material. If the screen is plugged,
replace it.
Reconnect the line to the expansion
valve.
5. Install a new receiver-dehydrator.
6. Install the replacement compressor.
7. Add the necessary quantity of oil to the system (one
fluid ounce because of receiver-dehydrator replace
ment plus the quantity needed for the replacement
compressor
- see
“ Checking Compressor Oil
Charge” under “ Checking Oil” .
8. Evacuate and charge the system.
9. Check system performance.
REFRIGERANT LINE CONNECTIONS
“ O ” Rings
Always replace the “ O” ring when a connection has
been broken. When replacing the “ O” ring, first dip it
in clean refrigeration oil. Always use a backing wrench
on “ O” ring fittings to prevent the pipe from twisting and
damaging the “ O” ring. Do not overtighten. Correct
torque specifications are as follows:
Metal
Tube
O.D.
Thread and
Fitting
Size
Steel
Tubing
Torque*
Alum.
Tubing
Torque*
1/4
7/16
13
6
3/8
5/8
33
12
1/2
3/4
33
12
5/8
7/8
33
20
3/4
1-1/16
33
25
*Foot Pounds.
NOTE:
Where steel to aluminum connections
are being made, use torque for aluminum tubing.
Hose Clamps
When hose clamp connections are encountered special
procedures are necessary for both installation and
removal.
Installation
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.
CA U TIO N :
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 lb. in.
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
retorqued only if its torque falls below 10 lb. in.
In this case, retorque to 20-25 lb. in. Further
tightening may damage the hose.
Removal
1. Carefully, with a sharp knife, make an angle cut in
the hose as shown in Figure 33. This should loosen
the hose so that it may be worked off the fitting.
2. Cut off slit end of hose when reinstalling. Reinstall
as described above.
CA U TIO N :
Use only approved refrigeration
hose. Never use heater hose. Use extreme
care not to nick or score the sealing beads when
cutting off the hose. Cutting the hose lengthwislT
may result in this problem.
REPAIR OF REFRIGERANT LEAKS
Any refrigerant leaks found in the system should be
repaired in the manner given below:
Leaks at “ O ” Ring Connection
1. Check the torque on the fitting and, if too loose,
tighten to the proper torque. Always use a 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 refrigerant
from the system as described under “ Evacuating
and Charging Procedures.”
3. Inspect the “ O” ring and the fitting and replace if
damaged in any way. Coat the “ O” ring before re
installed with clean refrigeration oil and install
carefully.
4. Retorque the fitting, using a backing wrench, and
then add 1/2 to 1 lb. of R-12 to the system and
recheck for leaks.
CA U TIO N :
Do not operate the system with this
small refrigerant charge.
5. Purge the system, thus removing the 1/2 to 1 lb.
installed in Step 4 above.
6. Evacuate and charge 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 connection.
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. Recheck the system for leaks by installing 1/2 to 1
lb. of R-12 into the system. Do not run compressor.
5. Purge the system, thus removing the 1/2 to 1 lb.
installed in Step 4 above.
6. Evacuate and charge the system.
Compressor Leaks
If leaks are located around the compressor shaft seal
or shell, replacement of necessary seals should be made
as outlined under “ Compressor” in the Chassis Overhaul
Shop Manual.
REFRIGERANT HOSE FAILURE
After a leak or rupture has occurred in a refrigerant
CHEVROLET TRUCK SERVICE MANUAL
Содержание 10 Series 1968
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Страница 52: ...HEATER AND AIR CONDITIONING 1A 21 Fig 32 Charging Schematic CHEVROLET TRUCK SERVICE MANUAL...
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Страница 128: ...BODY IB 61 Fig 135 A uxiliary Seat CHEVROLET TRUCK SERVICE MANUAL...
Страница 132: ...Fig 4 1 0 3 0 Series Truck Frame...
Страница 133: ...Fig 5 4 0 6 0 Single A xle Truck Frame E x c Tilt Cab...
Страница 135: ...Fig 7 4 0 6 0 Series Tilt Cab Truck Frames...
Страница 138: ...CHEVROLET TRUCK SERVICE MANUAL Fig 8 Underbody Reference Points and Dimensions Chevy Van G10 and G20 J FRAME 2 9...
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Страница 223: ...REAR SUSPENSION AND DRIVE LINE 4 54 Fig 101 Forward Rear Axle Assembly Exploded View CHEVROLET TRUCK SERVICE MANUAL...
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Страница 248: ...BRAKES 5 15 TD 50 60 Fig 26 Parking Brake Cables T Models CHEVROLET TRUCK SERVICE MANUAL...
Страница 299: ...BRAKES 5 56 Fig 88 Frame Mounted Vacuum Single Diaphragm Power Brake Installation CHEVROLET TRUCK SERVICE MANUAL I...
Страница 331: ...BRAKES 5 88 Fig 126 Stopmaster Brake Components Automatic Adjuster with Fail Safe CHEVROLET TRUCK SERVICE MANUAL...
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Страница 398: ...ENGINE FUEL 6M 5 Fig 7 C Throttle Linkage GS100 200 Fig 8C Throttle Linkage GE100 200 CHEVROLET TRUCK SERVICE MANUAL...
Страница 409: ...ENGINE FUEL 6M 16 Fig 12A CM KM 250 CM350 Fig 13A CM KM 250 CM350 CHEVROLET TRUCK SERVICE MANUAL...
Страница 410: ...ENGINE FUEL 6M 17 Fig 14A PE200 300 TE400 500 600 Fig 15A PT200 300 CHEVROLET TRUCK SERVICE MANUAL...
Страница 411: ...ENGINE FUEL 6M 18 Fig 18A V 8 Typical CHEVROLET TRUCK SERVICE MANUAL...
Страница 412: ...ENGINE FUEL 6M 20 ENGINE FUEL 6M 19 Fig 21 A CE100 200 With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 413: ...ENGINE FUEL 6M 20 Fig 2 2 A C S K A 1 00 200 CS300 With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 414: ...ENGINE FUEL 6M 21 Fig 25A CS PS SS400 CS M S SS500 CS600 TSOOO With Heat Stove CHEVROLET TRUCK SERVICE MANUAL...
Страница 470: ...CLUTCHES AND TRANSMISSIONS 7 7 Fig 14 Clutch Linkage Exploded View CHEVROLET TRUCK SERVICE MANUAL...
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Страница 549: ...STEERING 9 16 KA 10 20 CE ME SE 50 CE SE 60 Fig 29 Typical Power Steering Hose Routing CHEVROLET TRUCK SERVICE MANUAL...
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Страница 583: ...CHASSIS SHEET METAL 11 12 Fig 20 Designation and Name Plate CHEVROLET TRUCK SERVICE MANUAL...
Страница 585: ...CHASSIS SHEET METAL 11 14 SPECIAL TOOLS Fig 24 J 5544 1 Hood Spring Remover CHEVROLET TRUCK SERVICE MANUAL...
Страница 587: ...ELECTRICAL BODY AND CHASSIS 12 2 Fig 1 Fuse Panel CHEVROLET TRUCK SERVICE MANUAL...
Страница 591: ...ELECTRICAL BODY AND CHASSIS 12 6 CA SA MA 50 60 CHEVY VAN Fig 9 Front Lighting Assemblies CHEVROLET TRUCK SERVICE MANUAL...
Страница 596: ...ELECTRICAL BODY AND CHASSIS 12 11 Fig 15 Electrical Components Conv Cab CHEVROLET TRUCK SERVICE MANUAL...
Страница 611: ...r ELECTRICAL BODY AND CHASSIS 12 26 9 CHEVROLET TRUCK SERVICE MANUAL...
Страница 622: ...ELECTRICAL BODY A N D CHASSIS 12 37 IGNITION SWITCH Fig 44 Engine Compartment PA20 30 CHEVROLET TRUCK SERVICE MANUAL...
Страница 623: ...ELECTRICAL BODY A N D CHASSIS 12 38 Fig 45 Engine Compartment PS40 CHEVROLET TRUCK SERVICE MANUAL...
Страница 633: ...ELECTRICAi BODY A N D CHASSIS 12 48 Fig 55 Engine Compartment SE50 60 02 62 CHEVROLET TRUCK SERVICE MANUAL...
Страница 634: ...YJ ELECTRICAL CHASi V 49 4 Fig 56 Engine Compartment C D C G CD60 CHEVROLET TRUCK SERVICE MANUAL...
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Страница 698: ...SPECIFICATIONS 12 ENGINE TORQUES CHEVROLET TRUCK SERVICE MANUAL...
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