INFORMATION ON TIMING CHAIN TENSIONER LENGTH. Chevrolet Corvette 1992

SUBJECT: INFORMATION ON TIMING CHAIN TENSIONER LENGTH

MODELS: 1990-95 CHEVROLET CORVETTE WITH 5.7L (VIN J - RPO LT5) ENGINE AND MANUAL 6-SPEED TRANSMISSION

THE LH AND RH TIMING CHAIN TENSIONERS IN THE LT5 ENGINE CANNOT BE INSTALLED IN THEIR EXTENDED POSITIONS. IF THE LENGTH OF THE TENSIONERS ARE GREATER THAN 55 MM, (2.165 IN.) DO NOT USE THEM. SEE FIGURE 1. IF A TENSIONER IS RECEIVED FROM GMSPO IN THE EXTENDED POSITION, RETURN IT AS A BAD COMPONENT. WHEN A TENSIONER IS REMOVED FROM AN ENGINE, REPLACE IT WITH A NEW PART.

LH PN 10174325 RH PN 10174324

IF AN EXTENDED TENSIONER IS REINSTALLED IN THE ENGINE, IT WILL CREATE EXTREME LOADING ON THE TIMING CHAIN CAUSING THE TIMING CHAIN TO BREAK. WHEN THE TIMING CHAIN BREAKS, THE VALVES WILL CONTACT THE PISTONS AND CAUSE EXTREME ENGINE DAMAGE.

INSERT PICTURE #SPLT03

FIGURE 1

TOP: NON EXTENDED POSITION BOTTOM: EXTENDED POSITION

FIGURES: 1 ATTACHMENTS: 0

Object Number: 83698 Size: FS

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.