INFO. ON POSSIBLE INTERNAL ENGINE CYLINDER DAMAGE. GMC Truck GMC V Truck

SUBJECT: INFORMATION ON POSSIBLE INTERNAL ENGINE CYLINDER DAMAGE DUE TO GLOW PLUG BREAKING AFTER REPLACEMENT OF FAILED INJECTOR NOZZLE

MODELS: 1982-95 CHEVROLET AND GMC TRUCK LIGHT DUTY TRUCKS WITH 6.2L AND 6.5L DIESEL ENGINES (VINS C, F, J, P, S, Y - RPOS LH6, L65, LL4, L49, L56, L57)

WHENEVER AN INJECTOR NOZZLE HAS FAILED, THE TEMPERATURE IN THAT CYLINDER HAS INCREASED AND MAY CAUSE DAMAGE TO THE GLOW PLUG. THE GLOW PLUG MUST BE REPLACED AT THE SAME TIME A FAILED INJECTOR NOZZLE IS REPLACED, EVEN IF IT CHECKS OUT AS BEING GOOD.

IF THE GLOW PLUG IS NOT REPLACED, INTERNAL ENGINE DAMAGE MAY OCCUR. THE GLOW PLUG MAY BREAK AND PARTS OF IT MAY DAMAGE THE ENGINE.

FOLLOW THE PROCEDURE FOR GLOW PLUG REPLACEMENT IN THE SERVICE MANUALS.

PARTS INFORMATION:

PART NO. ENGINE NAME YEAR 25163212 LL4, LH6, L65 GLOW PLUG 1982-1993 25163212 L49, L56, L57, L65 GLOW PLUG 1994-1995

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

J4760 PLUGS, GLOW (DIESEL) REPLACE RIGHT BANK (ONE OR ALL) USE PUBLISHED LABOR OPERATION TIME.

J4761 PLUGS, GLOW (DIESEL) REPLACE LEFT BANK (ONE OR ALL) USE PUBLISHED LABOR OPERATION TIME.

J4767 PLUGS, GLOW (DIESEL) REPLACE LEFT BANK AND RIGHT BANK (ALL) USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0 ATTACHMENTS: 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 OCCURRING 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 THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GM DEALER SERVICING YOUR BRAND OF GM VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.