A/C - Joint Dual O-Ring System

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SUBJECT AIR CONDITIONING JOINT DUAL O-RING SYSTEM
(NEW PROCEDURE)


MODELS/YEARS 1989 NINETY-EIGHT AND EIGHTY-EIGHT MODELS
NUMBER: 89-T-60

CORP.REF.NO: 901202

DATE: April 1989

SECTION: 1B

Figure 1:

DUAL O-RING A/C JOINT

The 1989 Ninety-Eight, Eighty-Eight and Touring Sedan models introduce a new dual O-ring joint design for the A/C system which will increase durability of the joint seal by providing a second O-ring seal.

The dual O-ring fitting design consists of: (Refer to Figure 1)

^ Aluminum alloy externally threaded fitting which is brazed or welded to an aluminum tube.
^ Free spinning, plated steel, internally threaded nut.
^ Precisioned machine male piloted aluminum tube end which accommodates two O-rings.

Figure 2:

Figure 3:

Figure 4:

SERVICING THE DUAL O-RING JOINT

When attempting to service the dual O-ring joint, the following procedures should be followed:

- *Disassemble:

^ Make sure A/C system is completely discharged.

^ Use Kent-Moore Tool J 38042 (Dual O-ring disassembly tool), to separate the joint while loosening female nut. Refer to Figures 2, 3 and 4.

^ Remove and discard O-rings.

- Use nonmetallic tool when removing O-rings to prevent chance of damaging seal surface.

Figure 5:

- Replace O-rings

^ Avoid excessive stretch and twisting of replacement O-rings.

IMPORTANT: Dual O-ring fittings use a different size O-ring from standard A/C joint fittings (see Chart 5 below).

Figure 6:

- *Reassemble O-ring joint

- Carefully align forms (tubes) for pilot to bore insertion and push together completely (Refer to Figure 6).
- Slightly oiling the bore and O-rings will aid insertion.

^ Tighten steel nut. A torque of 15-20 ft.lbs. is required on all dual O-ring joints.

*NOTICE: The use of proper wrenches when loosening or making corrections is important. A backup wrench should be used on the brazed or welded fitting to prevent distortion of A/C lines.