CAMPAIGN: A.I.R. PUMP PULLEY MAY LOOSEN

GENERAL MOTORS HAS DETERMINED THAT SOME EARLY 1984 CORVETTES ARE EQUIPPED WITH AN A.I.R. PUMP PULLEY THAT MAY LOOSEN. CONTINUED OPERATION MAY CAUSE PULLEY DISENGAGEMENT, RESULTING IN LOSS OF THE DRIVE BELT. TO PREVENT THE POSSIBILITY OF THIS CONDITION OCCURING, IT WILL BE NECESSARY TO INSTALL NEW PUMP PULLEY BOLTS AND INSPECT THE PUMP PULLEY. WHEN REQUIRED, THE PULLEY AND PUMP ASSEMBLY WILL BE REPLACED. SERVICE PROCEDURE 1. OPEN HOOD. 2. RELEASE DRIVE BELT TENSION BY INSERTING A 3/8" DRIVE SOCKET HANDLE IN THE SQUARE HOLE ON THE AUTOMATIC BELT TENSIONER. LIFT (ROTATE) THE TENSIONER TO THE "UP" POSITION AND REMOVE THE DRIVE BELT. 3. REMOVE THREE(3) A.I.R. PUMP PULLEY ATTACHING BOLTS AND DISCARD. 4. INSPECT PULLEY FOR DAMAGE AT CENTER PILOT AND BOLT HOLES. IF PULLEY IS DAMAGED, (BOLT HOLES ELONGATED, PULLEY PILOT HOLE DEFORMED REPLACE PULLEY (P/N 14063753), PUMP (P/N 7842613), AND GASKET (P/N 14015367). 5. IF ORIGINAL PULLEY IS UNDAMAGED, REMOVE PAINT (WIRE BRUSH) FROM BACK MOUNTING SURFACE OF PULLEY AND FROM ATTACHING BOLT HOLE AREAS ON FRONT SURFACE OF PULLEY. 6. INSPECT AND REMOVE ANY FOREIGN MATERIAL FROM PULLEY MOUNTING SURFACE ON PUMP. 7. INSTALL PULLEY WITH THREE(3) NEW BOLTS. (USE ONLY BOLTS OBTAINED FROM ZONE. 8. TORQUE EACH BOLT A LITTLE AT A TIME TO 12 NM. OR 106 IN. LBS. 9. SPRAY PAINT (BLACK) FRONT OF PULLEY. 10. REINSTALL DRIVE BELT. REFER TO BELT ROUTING SHOWN ON THE UNDERHOOD LABEL. 11. REPOSITION DRIVE BELT TENSIONER IN THE ENGAGED (DOWN) POSITION. 12. INSTALL CAMPAIGN IDENTIFICATION LABEL. 13. CLOSE HOOD. PARTS INFORMATION PARTS REQUIRED TO COMPLETE THIS MODIFICATION ARE TO BE OBTAINED FROM YOUR CHEVROLET ZONE SERVICE DEPARTMENT. BECAUSE OF THE LIMITED NUMBER OF PARTS, DEALERS ARE TO REQUEST ONLY THOSE PARTS WHICH ARE ACTUALLY REQUIRED TO COMPLETE THIS MODIFICATION.

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.