UNDERBODY 'LOOSE LUMBER' OR RUBBER THUMPING NOISE. Buick Riviera 1995

REVISION: 06/06/96

THIS BULLETIN IS BEING REVISED TO UPDATE THE CORRECTION PROCEDURE AND ADD A PART NUMBER AND ARTWORK. PLEASE DISCARD CORPORATE BULLETIN NUMBER 53-34-04 (SECTION 3 - STEERING/SUSPENSION). **********************************************************************

SUBJECT: UNDERBODY "LOOSE LUMBER" OR RUBBER THUMPING NOISE FROM REAR OF VEHICLE (REPLACE REAR SHOCK MOUNT AND ADD WASHER)

MODELS: 1995-96 BUICK RIVIERA 1995-96 OLDSMOBILE AURORA

CONDITION:

SOME OWNERS MAY COMMENT ON A "LOOSE LUMBER" OR RUBBER THUMPING NOISE COMING FROM THE REAR OF THE VEHICLE WHEN ENCOUNTERING SMALL TO MEDIUM ROAD IMPACTS.

CORRECTION:

REPLACE PRODUCTION REAR SHOCK MOUNT WITH REVISED REAR SHOCK MOUNT AND ADD 2MM WASHER BETWEEN THE LOWER RETAINER AND THE SHOCK MOUNT.

1. ROAD TEST AND VERIFY NOISE.

2. REMOVE NECESSARY TRUNK TRIM TO ACCESS THE LEFT AND RIGHT UPPER SHOCK MOUNTS.

3. REMOVE SHOCK MOUNT COVER.

4. REMOVE CENTER (SHOCK TO SHOCK MOUNT) NUT AND RETAINER.

5. REMOVE SHOCK MOUNT (MOUNT TO BODY) NUTS AND REINFORCEMENT PLATE.

6. DISCONNECT ELC AIR LINE FROM SHOCK.

7. COMPRESS SHOCK DOWN AND REMOVE SHOCK MOUNT. LEAVE THE LOWER RETAINER ON THE SHOCK SHAFT.

IMPORTANT: MAKE NOTE OF THE ORIENTATION OF THE SHOCK MOUNT TO SHOCK. THE NEW MOUNT MUST BE INSTALLED IN THE SAME POSITION AS THE ORIGINAL MOUNT.

IMPORTANT: BE SURE TO REUSE THE ORIGINAL UPPER AND LOWER RETAINERS WHEN INSTALLING THE REVISED SHOCK MOUNT.

8. INSTALL 2MM WASHER, P/N 22173563, OVER THE LOWER RETAINER. SEE FIGURE 1.

9. REPLACE SHOCK MOUNT WITH REVISED SHOCK MOUNT, P/N 22166987. INSTALL REVISED SHOCK MOUNT ONTO TOP OF SHOCK.

10. INSTALL UPPER RETAINER AND NUT (SHOCK SHAFT TO SHOCK MOUNT).

11. PUSH UP AND EXPAND SHOCK INTO PLACE SO THAT THE MOUNT STUDS GO THROUGH THE SHOCK TOWER.

12. INSTALL SHOCK MOUNT NUTS AND TIGHTEN TO 20 N.M (15 LB FT).

13. TIGHTEN CENTER NUT TO 27 N.M (20 LB FT) (SHOCK SHAFT TO SHOCK MOUNT).

14. INSTALL SHOCK MOUNT COVER.

15. CONNECT ELC AIR LINE TO SHOCK.

16. REPEAT STEPS 3 - 15 FOR OPPOSITE SIDE SHOCK MOUNT REPLACEMENT.

17. INSTALL TRUNK TRIM.

18. ROAD TEST TO VERIFY CONCERN.

PARTS INFORMATION:

PARTS ARE EXPECTED TO BE AVAILABLE JUNE 3, 1996.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NO.: E5847 LABOR TIME: 0.5 HR

FIGURES: 01 ATTACHMENTS: 00

FIGURE 1: 1. NUT (SHOCK MOUNT TO SHOCK SHAFT) 2. UPPER RETAINER 3. 2MM WASHER 4. LOWER RETAINER 5. SHOCK MOUNT

Object Number: 96428 Size: FS

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.