INFO. ON ROLLER ROCKER ARMS VS. BALL & PIVOT ROCKER ARMS

SUBJECT: INFORMATION ON ROLLER ROCKER ARMS VS BALL AND PIVOT ROCKER ARMS

MODELS: 1995-96 BUICK CENTURY, REGAL, SKYLARK 1996 CHEVROLET BERETTA, CORSICA, LUMINA, MONTE CARLO 1995-96 OLDSMOBILE CUTLASS CIERA, CUTLASS SUPREME, ACHIEVA 1995-96 PONTIAC GRAND PRIX, GRAND AM WITH 3100 V6 ENGINE (VIN M - RPO L82)

APPROXIMATELY 4000 1995 A/N CARS WERE BUILT WITH ROLLER ROCKER ARMS. ALL OTHER 1995 3100 V6 ENGINES WERE BUILT WITH THE CONVENTIONAL BALL AND PIVOT TYPE ROCKER ARM. FOR 1996 THE 3100 V6 ENGINE CAN BE MANUFACTURED WITH EITHER ROLLER ROCKER ARMS OR BALL AND PIVOT TYPE ROCKER ARMS. FIGURE 1 SHOWS A ROLLER ROCKER ARM AS COMPARED TO FIGURE 2 WHICH SHOWS A CONVENTIONAL BALL AND PIVOT ROCKER ARM. YOU SHOULD NOT MIX ROCKER ARM TYPES ON THE SAME ENGINE. IT WILL BE NECESSARY TO DETERMINE WHICH TYPE OF ROCKER ARM DESIGN THE ENGINE WAS MANUFACTURED WITH WHEN SERVICING THE CYLINDER HEAD VALVE TRAIN COMPONENTS. GMSPO HAS SERVICE PARTS RELEASED FOR BOTH DESIGN TYPES.

FIGURES: 2 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 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.

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