ACCESSORY DRIVE INSTALLATION PART NUMBERS/PROCEDURE

THIS BULLETIN CANCELS AND SUPERSEDES 83-B-1 (OCTOBER, 1982) ALL COPIES OF WHICH SHOULD BE DESTROYED. SINCE THE RELEASE OF THE SUBJECT MODEL, CHANGES HAVE BEEN MADE TO THE ACCESSORY DRIVE AT THE FRONT OF THE ENGINE. THIS BULLETIN IDENTIFIES THE LATEST RELEASED PARTS, THE ATTACHING PROCEDURES AND HOW TO OBTAIN THE PROPER TORQUE AND BELT TENSION SPECIFICATIONS DURING ASSEMBLY. IF ANY OF THE MAJOR ACCESSORY DRIVE COMPONENTS REQUIRE REPLACEMENT OTHER THAN FOR NORMAL WEAR CONDITIONS, ALL OF THE COMPONENTS IN THE GROUP MAY HAVE BEEN SUBJECTED TO DAMAGING FORCES WHICH WILL REDUCE SERVICE LIFE. THEREFORE, SHOULD THIS OCCUR REPLACE ALL OF THE ACCESSORY DRIVE COMPONENTS ACCORDING TO THE FOLLOWING PROCEDURE: TO ORDER PARTS: 1.OBTAIN THE V.I.N. OF THE SUBJECT TRUCK. 2.FIND THE V.I.N. RANGE ON THE CHART BELOW TO DETERMINE THE NECESSARY PART NUMBERS TO BE ORDERED: ALL 1980 AND 1981 THROUGH VIN BV587754-GMC BV133819-CHEV. 1 2093715* SUPPORT 1 2055465* PULLEY 1 2053572* HOUSING 3 11500945 BOLT 1 9418942 PTN NUT 1 2436168 WASHER 1 15504174 CLUTCH ASSEMBLY 1981 AND 1982 MODELS FROM VIN BV587755 TO CV593483 BV133820 TO CV134456 1 2093715* SUPPORT 1 2055465* PULLEY 1 15504174 CLUTCH ASSEMBLY THE PULLEY MUST BE REPLACED EVEN THOUGH IT DOES NOT APPEAR TO BE DAMAGED REGARDLESS OF V.I.N. * PULLEY IS ETCHED WITH INSPECTION DATE (I.E.7/15) ON REAR UNPAINTED FACE OF PULLEY. SUPPORT IS ETCHED WITH INSPECTION DATE ON REAR UNPAINTED FACE. HOUSING IS ETCHED WITH INSPECTION DATE ON UPPERMOST BOLT SLOT, THE FRONT UNPAINTED EDGE. ONLY DATED (INSPECTED) PARTS SHOULD BE USED. SEE FIGURE NO. 3 FOR LOCATION OF DATE. THE REPLACEMENT PROCEDURE AND ALL TORQUES AND TORQUING PROCEDURES BELOW MUST BE STRICTLY ADHERED TO. 1.CLEAN THE MOUNTING SURFACES ON THE ENGINE OF ALL PAINT AND CHECK THESE SURFACES FOR FLATNESS. 2.INSTALL SUPPORT P/N 2093715, USING P/N 2436165 (4 REQUIRED) 1/2 INCH PLAIN WASHERS AND P/N 9425082 BOLTS (4 REQUIRED) 1/2-13X 1-1/4"-TORQUE 85-105 LB.FT. 3.BEFORE INSTALLING THE NEW PULLEY TO THE NEW HOUSING ASSEMBLY, CHECK PULLEY FOR PAINT IN TAPER AND REMOVE IF FOUND. 4.PLACE THE PULLEY ON THE TAPERED SHAFT, INSTALL WASHER AND PREVAILING TORQUE NUT AND TORQUE 90-110 LB.FT. MAKING SURE THE SHAFT IS NOT TURNING INSIDE THE PULLEY. AN IMPACT AIR WRENCH SHOULD BE USED TO SEAT THE PULLEY ON THE SHAFT. * SEE BULLETIN FOR COMPLETE DETAILS *

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.