RH (RIGHT HAND) SIDE EXHAUST MANIFOLD CRACKS. Chevrolet Impala 1995

SUBJECT: RH (RIGHT HAND) SIDE EXHAUST MANIFOLD CRACKS (INSTALL A NEW MANIFOLD)

MODELS: 1994-96 CHEVROLET CAPRICE WITH 4.3L, 5.7L ENGINES (VINS W, P - RPOS L99, LT1) AND 4L60-E TRANSMISSION

CONDITION:

SOME VEHICLES, PRIMARILY POLICE VEHICLES, MAY EXHIBIT A CRACKED EXHAUST MANIFOLD ON THE RH SIDE OF THE ENGINE.

CAUSE:

THERMAL CYCLING STRESS DUE TO HIGH AMBIENT TEMPERATURES CAUSED BY EXTREME DRIVING CONDITIONS AND HIGH ENGINE SPEEDS.

CORRECTION:

THERE ARE TWO TYPES OF EXHAUST MANIFOLDS USED FOR THE 1994 THROUGH 1996 MODEL YEARS. ONE MANIFOLD FOR THE 1994 AND EARLY 1995 MODEL YEARS HAS THE AIR TUBE SCREWED DIRECTLY INTO THE MANIFOLD. THE OTHER TYPE OF MANIFOLD FOR THE LATE 1995 AND ALL 1996 MODEL YEARS USES A MALE FITTING IN THE EXHAUST MANIFOLD WHICH THE AIR TUBE ATTACHES TO.

PARTS INFORMATION TO ADDRESS THE EXHAUST MANIFOLD CRACKING CONCERN FOR THE 1994 AND EARLY 1995 VEHICLES INSTALL MANIFOLD, P/N 12524289, AND CUT THE METAL TIE BAR BETWEEN THE NUMBER 6 AND 8 EXHAUST PORT. SEE FIGURE 1. FOR THE LATE 1995 AND ALL 1996 VEHICLES INSTALL EXHAUST MANIFOLD, P/N 12556731. THESE MANIFOLDS ARE NEW FOR 1996 AND ARE CAST WITHOUT THE METAL TIE BAR. USE GASKET, P/N 12552469, AND REFER TO BULLETIN 47-66-03 FOR BOLT USAGE.

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION: J0100 LABOR TIME: USE PUBLISHED LABOR OPERATION TIME.

INSTALL FIGURE #SPOLT101

FIGURE 1 CUT AT ARROWS

FIGURES: 1 ATTACHMENTS: 0

Object Number: 96409 Size: SH

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.