Major Internal Mechanism - Chevrolet 1973 Overhaul Manual

gears, valve reeds and the area where the head
casting web sealing surface will contact the valve
plate.
5. Install the head-to-shell "O " ring.
6. Be sure that the suction screen is properly
positioned in the rear head, then assemble the rear
head to the compressor shell being careful not to
damage the sealing surface of the head casting
webs.
Be sure head does not bind against
CAUTION:
oil pump gears when being installed.
1. Install new nuts to the threaded shell studs and
tighten to 19-25 ft. lbs. torque.
8. Leak test the compressor as outlined under "Leak
Testing the Compressor" in this section.
9. Install compressor in the vehicle.

Major Internal Mechanism

The clutch hub and drive plate assembly, drive key,
pulley, and coil housing and shaft seal should be
removed before proceeding with the following compres­
sor disassembly.
Removal from Shell
1. Remove the rear head, discharge plate and suction
reed valve from the compressor as outlined under
"Rear Head and Reed Valve Assemblies."
2. Remove the oil inlet tube and "O" ring with Tool
J-5139 as shown in Figure 16.
3. Carefully lay the compressor shell on its side and
slide out interior mechanism and front head
assembly. DO NOT hammer or use undue force to
remove the mechanism; however, gentle taps on the
head casting may aid in removing the assembly.
DO NO T hammer or tap on the
CAUTION:
compressor shaft.
4. Remove front head casting, front discharge valve
plate and suction reed valve from the mechanism.
Examine parts for damage and replace if necessary.
Check particularly for damage to the sealing
surfaces of the front head casting webs.
5. Examine the mechanism for any obvious damage.
6. Remove the suction crossover cover (fig. 17).
7. If desired, the mechanism may be assembled in
Checking Cage J-9397 and operated on a motor test
stand, or by some other suitable means, to observe
sound level and general operation. Tighten cage
nuts evenly to 14-16 ft. lbs. torque.
8. Remove mechanism from the cage.
Disassembly
If the mechanism has sustained major damage, due
possibly to loss of refrigerant and/or oil, it may be
necessary to replace it with a complete service interior
AIR C O N D IT IO N IN G COM PRESSOR
Fig. 17- Removing Suction Crossover Cover
mechanism assembly rather than to replace individual
parts. If further disassembly is considered worthwhile,
proceed as follows:
1. Before disassembling the cylinder and mechanism,
number the pistons and cylinder locations so that
all parts may be replaced in their original location.
Pistons and cylinder bores may be identified by
numbering them 1, 2 and 3 with a pencil.
2. Use an old discharge tube to drive discharge tube
out of cylinder (fig. 18): Drive from REAR of
cylinder.
3. Drive the cylinder halves apart and free from the
dowel pins and discharge crossover tube using a
fiber block and mallet (fig. 19). Discard the
discharge crossover tube.
NOTE: Before driving cylinder halves apart,
position wobble plate toward front of
compressor in area of crossover tube.
1-9
OVERHAUL MANUAL