Leak Testing The Compressor - Chevrolet 1973 Overhaul Manual

1 -1 4 AIR C O N D IT IO N IN G COMPRESSOR
Fig. 2 7 -ln s ta llin g Shell Over In te rn a l M echanism
larger diameter hole in the center than the
rear discharge plate.
6. Check the sealing surface of the compressor front
head casting webs and replace the entire casting if
there is any evidence of damage. Discard the "O"
ring.
7. Coat the valve plate with clean refrigeration oil.
Rotate the front head casting until it is properly
positioned over the discharge reed retainers and
dowel pins, then set it in place (being careful not to
damage the sealing surfaces) and seat it over
dowels with light mallet taps.
NOTE: Dowel pin and hole location can be
marked with pencil to aid in locating proper
position.
8. Apply clean refrigeration oil to a new "O" ring and
"O " ring groove at the lower edge of the front head
casting and carefully assemble the "O " ring in the
groove.
9. Coat the inside machined surfaces of the compres­
sor shell with refrigeration oil.
10. Locate the oil intake tube hole in the rear discharge
plate. Line up the oil sump with this hole location
and slide the shell down over the mechanism while
supporting the mechanism on Fixture J-21352 (fig.
27).
NOTE: Raise the front head slightly to
facilitate shell installation and to reduce the
possibility of damaging the "O " ring.
11. Place Compressor Support Bracket J-9396 in a vise
and, carefully inverting the compressor shell with
the mechanism inside, mount the front compressor
flange on the support bracket.
12. Place a new "O" ring in the oil intake tube hole
applying clean refrigeration oil to the oil intake
tube hole and the "O " ring. Rotating the
compressor mechanism to line up with the hole in
the compressor oil sump baffle, install the pickup
tube. Be sure that the "O " ring and intake tube are
properly seated.
13. Assemble the dowel pins into the rear cylinder.
14. Install the discharge crossover tube rear "O" ring
and spacer.
15. Replace the rear suction reed valve, rear discharge
valve plate, oil pump gears, rear head and head
nuts as outlined previously under "Rear Head and
Reed Assemblies—Installation."
16. Install a new shaft seal assembly kit as outlined
under "Shaft Seal Assembly-Installation."
17. Reinstall the coil housing, pulley and bearing
assembly and hub and drive plate assembly as
outlined earlier in this section.

Leak Testing The Compressor

Whenever service operations are performed on the
compressor shaft seal assembly or on the interior
mechanism, use the following procedure to leak test the
reassembled compressor:
1. Install "O" rings and Cover Plate J-9527 over the
suction and discharge ports of the compressor head.
2. Check and add oil to the compressor as outlined
under "Checking Compressor Oil Charge" in the
Chassis Service Manual.
3. Temporarily install the shaft nut. With the
compressor in the horizontal operating position (oil
sump down), rotate the compressor shaft several
times in the normal direction of rotation.
4. Hook up a Refrigerant-12 container and charging
line (using Adapter J-5420) to cover plate fitting
over the suction port, charge the compressor up to
can pressure, and leak test compressor with a leak
detector.
5. Turn off the refrigerant container valve. Transfer
gauge line and adapter to cover plate fitting over
the discharge port and repeat the procedure
outlined in Step 4.
6. Correct any leaks present.
OVERHAUL MANUAL