CATALYTIC CONVERTER REPLACE PARTS INFORMATION

MODELS: 1982 CABALLERO'S WITH 3.8L, 4.4L AND 5.0L ENGINES

Approximately April 17, 1982, the assembly plant producing the Caballero began installing single bed bead catalytic converters in place of the dual bed bead catalytic converters.

If it becomes necessary to replace the catalytic converter on subject vehicles, you must determine what type of converter the vehicle has. The dual beds have a fresh air supply port near the inlet end of the converter.

Caballero's equipped with the single bed bead converter (produced after April 17, 1982) can be serviced using standard replacement procedures and labor times.

Caballero's equipped with the dual bed bead converter (produced before April 17, 1982) must be serviced using the single bed bead converters as described in this bulletin.

Refer to Figure No. 1 for catalytic converter usage.

CATALYTIC CONVERTER REPLACEMENT

1. Raise vehicle on hoist.

2. Disconnect air supply pipe from catalytic converter.

3. Disconnect intermediate exhaust pipe from converter.

4. Disconnect converter hanger at converter.

5. Remove clamp from front of converter then remove converter.

6. Reverse removal procedure (except for air supply pipe) for installation of the new single bed catalytic converter. Refer to Figures No. 1, 2 and 3 for part numbers and installation torques.

7. Lower vehicle.

CONVERTER AIR SUPPLY MODIFICATION

Caballero's with 3.8L (229), 4.4L or 5.0L without H.D. (80 amp) alternator - refer to Figures No. 4 and No. 5.

1. Remove and discard the converter air supply pipe, check valve and the hose from the air management valve.

2. Cut the divert hose from the air management valve to the air cleaner 100mm from the air management valve and remove 30mm of hose.

3. Insert "Y" connector, P/N 14031110, into the cut lengths.

4. Install hose, P/N 14045881, between the converter air supply port of the air management valve and "Y" connector, trimming the hose as required.

5. Install clamp, P/N 1470030, at both ends of hose, P/N 14045881, and torque to specifications.

6. For Caballero's with 4.4L or 5.0L engines and Federal emissions (NA5 or NA6) reset timing as specified below:

BEFORE AFTER

Caballero with 2 DEG BTC reset to 2 DEG ATC 4.4L

Caballero with 6 DEG BTC reset to 2 DEG BTC 5.0L

7. For vehicles that required an engine timing change, install a new vehicle emission certification label. Refer to page 2 for details.

8. Clean an area near the vehicle emission cerfification label with a degreasing type cleaning fluid (not soap and water) and install the Service Modification Label, P/N 14065523.

Caballero's with 4.4L, 5.0L and H.D. (80 amp) alternator - refer to Figure No. 8.

1. Remove hose from the converter air supply check valve. Leave this hose attached to the air management valve.

2. Remove and discard converter air supply pipe and check valve.

3. Cut the divert hose from the air management valve to the air cleaner 170mm from the air management valve and remove 30mm of hose.

4. Insert "Y" connector, P/N 14031110, into cut lengths.

5. Using existing hose from the converter air supply, cut as required and install on the "Y" connector and retain with damp, P/N 1470030, and torque to specifications.

6. Clean an area near the vehicle emission certification label with a dereasin type cleaning (not soap and water) and install the Service Modification Label, P/N 14065523.

VEHICLE EMISSION CONTROL INFORMATION LABELS (FOR FEDERAL AND HIGH ALTITUDE CABALLERO'S WITH 4.4L AND 5.0L ENGINES ONLY AND WITHOUT H.D. ALTERNATOR)

Caballero's that require a timing change must also have the existing vehicle emission certification label removed and replaced with one (1) of the three (3) new labels listed below. To replace the label, simply peel off the old label and place the new label in the same location. It is not necessary to remove the remains of the old label that will stay adhered to the fan shroud.

Two (2) Federal Certification Labels will be sent to each dealer. If additional labels are required, order them through your GMC Zone Office.

High altitude labels (P/N 14065522) will be available through the zone offices in high altitude areas. This is because of the low volume of high altitude vehicles built with the dual bed bead converters.

Old Label New Label Part No. & Code Part No. & Code Caballero with 4.4L NA5 (Federal) 14048893 CIA or 14065520 LBN 14055193 CVH

Caballero with 5.OL and NA5 (Federal) 14044690 CCJ 14065521 LBR Caballero with 5.OL NA6 (high altitude) 14060685 CWW 14065522 LBS

SERVICE MODIFICATION LABEL

Caballero's modified as described in this bulletin (regardless if a timing change is made or not) must have a Service Modification Label, P/N 14065523, installed. A supply of Service Modification Labels will be sent to each dealer. If additional labels are required, order them through your GMC Zone Office.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.