MPOSE/VIBRATION/GROWL FROM FRONT OF VEHICLE. Buick Park Avenue 1997

REVISION: 05/08/98 DIVS INVL 3 4 7

THIS BULLETIN IS BEING REVISED TO ADD THE 1998 MODEL YEAR. PLEASE DISCARD CORPORATE BULLETIN NUMBER 73-71-04 (SECTION 7 - TRANSMISSION) ______________________________________________________________________

SUBJECT: NOISE/VIBRATION/GROWL FROM FRONT OF VEHICLE ON RIGHT TURNS OR HARD ACCELERATION (REPLACE/REPOSITION REAR TRANSAXLE MOUNT)

MODELS: 1995-98 BUICK RIVIERA 1997-98 BUICK PARK AVENUE 1995-98 OLDSMOBILE AURORA

CONDITION:

SOME OWNERS MAY COMMENT ON A NOISE, VIBRATION OR GROWL FROM FRONT OF VEHICLE DURING RIGHT TURNS OR HARD ACCELERATION.

CAUSE:

THE REAR TRANSAXLE MOUNT MAY BE GROUNDED OUT DUE TO A BOUND OR TWISTED CONDITION WITHIN THE MOUNT.

CORRECTION:

FOR 1995-96 VEHICLES: ====================

THIS CONDITION MAY BE CORRECTED BY REPLACING THE REAR TRANSAXLE MOUNT WITH A REVISED MOUNT, P/N 22174976 - AURORA, P/N 22174975 - RIVIERA. SEE PROCEDURE BELOW.

FOR 1997-98 VEHICLES: =====================

THE 1997-98 VEHICLES HAVE BEEN BUILT WITH IMPROVED MOUNTS BUT MAY STILL EXHIBIT THE CONDITION IF THE MOUNT IS BOUND OR TWISTED. THIS CONDITION MAY BE CORRECTED BY FOLLOWING THE PROCEDURE LISTED BELOW TO CORRECT THE BOUND OR TWISTED CONDITION WITHIN MOUNT.

1995-96 G-CAR -

1. RAISE THE VEHICLE.

2. SUPPORT THE TRANSAXLE WITH A SCREWJACK.

3. REMOVE THE REAR TRANSAXLE MOUNT NUTS.

4. USING THE SCREWJACK, LOWER THE TRANSAXLE.

5. REMOVE THE MOUNT FROM THE LOWER FRAME RAIL.

6. INSTALL THE NEW TRANSAXLE MOUNT TO THE LOWER FRAME RAIL.

7. RAISE THE TRANSAXLE WITH THE SCREWJACK UNTIL THE TRANSAXLE BRACKET CONTACTS THE MOUNT. CHECK MOUNT ALIGNMENT AND REPOSITION THE MOUNT AS NECESSARY TO CENTER THE MOUNT STUDS WITHIN THE MOUNT ITSELF. SEE FIGURE 1.

IMPORTANT:

THE MOUNT STUDS WILL NOT ALWAYS BE CENTERED IN THE MOUNT BRACKET. THIS IS A NORMAL CONDITION. THE MOUNT BRACKET IS SLOTTED TO ALLOW FOR CROSS CAR BUILD VARIATION AND SHOULD NOT BE USED TO DETERMINE IF THE MOUNT IS POSITIONED CORRECTLY.

8. RAISE THE TRANSAXLE WITH THE SCREWJACK TO FULLY LOAD THE MOUNT.

IMPORTANT:

LOADING THE MOUNT IS IMPORTANT BECAUSE THE MOUNT STUDS COULD POTENTIALLY TWIST IN THE BRACKET WHILE TIGHTENING THE MOUNT NUTS, CREATING A TWISTED OR BINDING CONDITION WITHIN THE MOUNT.

9. TIGHTEN THE MOUNT NUTS TO 45 N.M (33 LB FT).

10. REMOVE THE SCREWJACK AND VERIFY MOUNT ALIGNMENT.

1997-98 C/G CARS -

1. RAISE THE VEHICLE.

2. SUPPORT THE TRANSAXLE WITH A SCREWJACK.

3. LOOSEN THE REAR TRANSAXLE MOUNT NUTS. DO NOT FULLY REMOVE THE NUTS.

4. USING THE SCREWJACK, UNLOAD THE MOUNT BY LOWERING THE TRANSAXLE.

5. ADJUST OR REPOSITION THE MOUNT TO ELIMINATE ANY BIND OR TWIST.

6. USING THE SCREWJACK, RAISE THE TRANSAXLE UNTIL THE TRANSAXLE BRACKET CONTACTS THE MOUNT. CHECK MOUNT ALIGNMENT AND REPOSITION THE MOUNT AS NECESSARY TO CENTER THE MOUNT STUDS WITHIN THE MOUNT ITSELF. SEE FIGURE 1.

IMPORTANT:

7. RAISE THE TRANSAXLE WITH THE SCREWJACK TO FULLY LOAD THE MOUNT.

IMPORTANT:

LOADING THE MOUNT IS IMPORTANT BECAUSE THE MOUNT STUDS COULD POTENTIALLY TWIST IN THE BRACKET WHILE TIGHTENING THE MOUNT NUTS, CREATING A TWISTED OR BINDING CONDITION WITHIN THE MOUNT.

8. TIGHTEN THE MOUNT NUTS TO 45 N.M (33 LB FT).

9. REMOVE THE SCREWJACK AND VERIFY MOUNT ALIGNMENT.

PARTS INFORMATION:

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: K6723 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 01 ATTACHMENTS: 00

Object Number: 169550 Size: SF

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.