ENGINE OIL COOLER LINE LEAK. GMC Truck GMC K Pickup

SUBJECT:ENGINE OIL COOLER LINE LEAK (REPLACE LINES/TRIM AWAY FRONT OF DASH NOISE INSULATOR)

MODELS 1994 CHEVROLET AND GMC TRUCK C/K MODELS WITH 6.5L DIESEL ENGINE (VINS F, P, S - RPOS L65, L49, L56)

CONDITION:

THE ENGINE OIL COOLER LINES MAY DEVELOP A LEAK AT THE REAR OF THE ENGINE.

CAUSE:

IF THE ENGINE OIL COOLER LINES ARE IN CONTACT WITH THE FRONT OF DASH NOISE INSULATOR PAD, NORMAL MOTION OF THE ENGINE ON THE MOUNTS CAN CAUSE THE OIL COOLER LINES TO RUB AGAINST THE PAD AND WEAR A HOLE IN THE LINES.

CORRECTION:

REPLACE THE LINES AS REQUIRED FOLLOWING THE SERVICE MANUAL PROCEDURE (6B1-26). ALSO, TRIM AWAY SUFFICIENT MATERIAL FROM THE FRONT OF DASH NOISE INSULATOR PAD TO PROVIDE CLEARANCE FOR THE LINES AS NEEDED TO PREVENT CONTACT WITH THE ENGINE RUNNING. IT IS PERMISSIBLE TO ALSO GENTLY BEND THE LINES IN THE AREA WHERE THEY PASS NEAR THE PAD TO GAIN ADDITIONAL CLEARANCE, BUT ONLY IF NECESSARY.

SERVICE PARTS INFORMATION

P/N DESCRIPTION QTY 15657399 HOSE, ENGINE OIL COOLER, OUTLET 1 15695859 HOSE, ENGINE OIL COOLER, INLET 1 15655018 HOSE, ENGINE OIL COOLER, INLET 1 15655019 HOSE, ENGINE OIL COOLER, OUTLET 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME J3176 HOSE, ENGINE OIL COOLER-REPLACE USE PUBLISHED J3177 HOSE, ENGINE OIL COOLER-REPLACE-BOTH LABOR OPERATION TIME

FIGURES: 0

CAPTIONS:

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.