EARLY CLUTCH WEAR-OUT AND/OR CLUTCH CHATTER/SHUDDER. GMC Truck GMC C Pickup

SUBJECT: EARLY CLUTCH WEAR-OUT AND/OR CLUTCH CHATTER/SHUDDER ON LAUNCH (INSTALL CLUTCH KIT)

MODELS: 1992-95 CHEVROLET AND GMC C/K AND P3 MODELS WITH 6.5L DIESEL ENGINE (VINS F, P - RPOS L65, L49) AND MANUAL TRANSMISSION

CONDITION:

EARLY WEAR-OUT OF THE CLUTCH. THE VEHICLE MAY ALSO HAVE CLUTCH CHATTER OR SHUDDER WHEN LAUNCHING FROM A STOP.

CORRECTION:

THE FOLLOWING COMPONENTS SHOULD BE INSTALLED: - CLUTCH KIT WITH MORE WEAR RESISTANT FACING MATERIAL AND REVISED TUNING (DISC AND PRESSURE PLATE ASSEMBLY) - RELEASE BEARING WITH A STEEL SLEEVE - RELEASE FORK WITH CORRECTED FORK TIP RADIUS - NEW PILOT BEARING

IF THE FLYWHEEL SHOWS SIGNS OF EXCESSIVE WEAR, A SECONDARY FLYWHEEL REPLACEMENT KIT IS AVAILABLE THROUGH GMSPO AS P/N 15958496. THIS SECONDARY FLYWHEEL KIT SHOULD BE USED RATHER THAN REPLACING THE COMPLETE DUAL MASS FLYWHEEL (DMF) ASSEMBLY.

SERVICE PROCEDURE:

FOLLOW THE APPROPRIATE SERVICE MANUAL PROCEDURE, SECTION 7C, CLUTCH, FOR CLUTCH ASSEMBLY REPLACEMENT. SECTION 6A6, 6.5L DIESEL CONTAINS INSTRUCTIONS FOR SECONDARY FLYWHEEL REPLACEMENT.

NOTICE: ALIGN THE LIGHT SIDE OF THE PRESSURE PLATE ASSEMBLY, IDENTIFIED BY A PAINT DOT NEAR A BOLT HOLE, WITH THE HEAVY SIDE OF THE FLYWHEEL, IDENTIFIED BY AN "X". TIGHTEN EACH PRESSURE PLATE BOLT ONE TURN AT A TIME TO EVENLY COMPRESS THE SPRING AND AVOID WARPING THE PRESSURE PLATE ASSEMBLY.

TORQUE THE PRESSURE PLATE BOLTS TO 34 N.M (25 LB.FT.) FOLLOWING THE SERVICE MANUAL PROCEDURE.

PARTS INFORMATION:

P/N DESCRIPTION QTY 12388077 CLUTCH KIT, 6.5L 1 15613306 CLUTCH RELEASE BEARING 1 12385352 CLUTCH FORK 1 14061685 CLUTCH PILOT BEARING 1 15958496 FLYWHEEL KIT 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME K0800 CLUTCH DISC AND/OR USE PUBLISHED COVER - REPLACE LABOR OPERATION TIME

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 0

CAPTIONS: 0

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.