A/C Compressor Oval O-Ring Seal - Revised Design
89Oldsmobile08SUBJECT: A/C COMPRESSOR OVAL O-RING SEAL (DESIGN INFORMATION)
MODELS/YEARS: ALL 1988-90 CUTLASS CIERA, CUSTOM CRUISER,
NINETY-EIGHT, EIGHTY-EIGHT,TORONADO,
CUTLASS CALAIS AND CUTLASS SUPREME MODELS
WITH R4, HR6 AND V5 A/C COMPRESSORS
NUMBER: 90-T-07
CORP. REF. NO: 931204
DATE: September 1989
SECTION: 1D
Figure 1:
Figure 2:
During the 1988 model year, approximately June 1, 1988, the cross section design of the A/C compressor Orings was changed from the standard round type to an oval type design.
Parts are currently available from GMSPO.
The reason for the design change was to improve the durability of the compressor refrigerant joint.
It is important to understand, that due to the cross section shape of the oval verses the round design (see Fig. 2), the oval O-ring does not completely fill the machined O-ring groove in the compressor rear head (see Fig. 1). A gap between the oval O-ring inside diameter and the machined groove inside diameter is correct and expected.
In addition, the oval O-ring does not fit freely in the O-ring groove. The O-ring must be coated with approved refrigerant oil and inserted all the way into the O-ring groove prior to the joint assembly.
The service part numbers for the oval O-rings:
O.E.M. 6558587
AC Delco 15-3886
GMP 65568587