INFO. ON CLUTCH PILOT BUSHINGS AND BEARINGS. GMC Truck GMC V Truck

SUBJECT: INFORMATION ON CLUTCH PILOT BUSHINGS AND BEARINGS

MODELS: 1988-95 CHEVROLET AND GMC TRUCK LIGHT DUTY TRUCKS WITH 4.3L, 5.0L, 5.7L, 6.2L, 6.5L, 7.4L ENGINES AND MANUAL TRANSMISSION

A WORN OR DAMAGED CLUTCH PILOT BUSHING OR BEARING, LOCATED IN THE END OF THE CRANKSHAFT, CAN BE THE CAUSE OF VARIOUS CLUTCH AND TRANSMISSION CONCERNS INCLUDING:

-NOISE WHEN THE CLUTCH PEDAL IS DEPRESSED -TRANSMISSION NOISE -CLUTCH SHUDDER ON LAUNCH -DIFFICULT SHIFTING OR EXCESSIVE CLASH INTO REVERSE

A WORN CLUTCH PILOT BUSHING WILL NOT PROPERLY SUPPORT THE TRANSMISSION INPUT SHAFT. WITHOUT SUFFICIENT SUPPORT, THE FRONT OF THE INPUT SHAFT CAN MOVE OUT OF LOCATION RESULTING IN TRANSMISSION NOISE OR CLUTCH SHUDDER ON ENGAGEMENT.

A DAMAGED CLUTCH PILOT BUSHING OR BEARING MAY CONTINUE TO TURN THE TRANSMISSION INPUT SHAFT WHEN THE CLUTCH IS RELEASED. THIS ROTATION CAN THEN CAUSE DIFFICULT SHIFTING OR GEAR CLASH.

ANYTIME A TRANSMISSION OR CLUTCH IS REMOVED FOR REPAIR, A NEW CLUTCH PILOT ROLLER BEARING SHOULD BE INSTALLED. THE END OF THE TRANSMISSION INPUT SHAFT THAT CONTACTS THE PILOT ROLLER BEARING SHOULD ALSO BE INSPECTED FOR DAMAGE.

WHEN INSTALLING THE PILOT ROLLER BEARING, THE CHAMFER OR LEAD-IN TO THE I.D. SHOULD BE INSTALLED FACING THE REAR OF THE VEHICLE. THIS CHAMFER WILL HELP GUIDE THE INPUT SHAFT INTO THE ROLLER BEARING. THIS BEARING IS PRE-LUBED WITH A HIGH TEMPERATURE GREASE AND DOES NOT REQUIRE ADDITIONAL LUBRICATION.

THE BEARING LISTED BELOW WILL FIT ALL 1988-95 4.3L, 5.0L, 5.7L, 6.2L, 6.5L, AND 7.4L LIGHT DUTY ENGINES. DO NOT USE A BRONZE CLUTCH PILOT BUSHING.

SERVICE PARTS INFORMATION:

P/N DESCRIPTION QTY 14061685 BEARING, CLUTCH PILOT 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

FIGURES: 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.