USE OF WACKER T-330 RTV SEALANT (PRONOUNCED VAUCKER T). GMC Truck GMC MD Bus Chassis (B Model) 1996

REVISION: 07/30/96

THIS BULLETIN IS BEING REVISED TO ADD FURTHER CHEVROLET MODELS. PLEASE DISCARD CORPORATE BULLETIN 67-61-17 (SECTION 6 - ENGINE). ----------------------------------------------------------------------

SUBJECT: INFORMATION ON USE OF WACKER T-330 RTV SEALANT (PRONOUNCED VAUCKER T)

MODELS: 1990-96 BUICK ROADMASTER, ESTATE WAGON 1990-96 CADILLAC FLEETWOOD 1990-96 CHEVROLET CAMARO, CAPRICE, CORVETTE, IMPALA SS 1990-92 OLDSMOBILE CUSTOM CRUISER 1990-96 PONTIAC FIREBIRD WITH 4.3L, 5.7L ENGINE (VINS W,P,5,8--RPOS L99,L98,LT1,LT4)

1990-96 CHEVROLET AND GMC LIGHT AND MEDIUM DUTY TRUCKS WITH 4.3L, 5.0L, 5.7L, 6.0L, 7.0L, 7.4L ENGINES (VINS W, Z, E H, K, M, N, P, R - RPOS L35, LB4, L03, L05, LS0, LR0, L19, L30, L31)

WHEN INSTALLING THE INTAKE MANIFOLD, USE A 5MM (1/4 IN.) THICK BEAD OF WACKER T-330 RTV, P/N 12346192, ON THE FRONT AND REAR SEALING AREAS BETWEEN THE ENGINE BLOCK AND INTAKE MANIFOLD. SEE FIGURES 1 AND 2. WACKER T-330 RTV HAS IMPROVED ADHESIVE ABILITIES, IS OXYGEN SENSOR SAFE, AND IS NONCORROSIVE TO FERROUS METALS. WACKER T-330 RTV CANNOT BE USED IN COOLANT SEALING SURFACE AREAS.

INSERT PICTURE #2906T9056

FIGURE 1

FRONT OF BLOCK

INSERT PICTURE #2906T9054

FIGURE 2

REAR OF BLOCK

FIGURES: 2 ATTACHMENTS: 0

Object Number: 93546 Size: MF

Object Number: 93545 Size: MF

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.