For 1990-2009 cars

# SMU - SEC. 6 - ENG. MECHANICAL REVISED PISTON RING GAP,

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 6 - ENGINE MECHANICAL - REVISED PISTON RING GAP, CRANKSHAFT MAIN BEARING CLEARANCE AND PISTON PIN SPECIFICATIONS

#### MODELS: 1996-97 BUICK SKYLARK 1996-97 OLDSMOBILE ACHIEVA 1996-97 PONTIAC GRAND AM WITH 3100 V6 ENGINE (VIN M - RPO L82)

THIS BULLETIN IS BEING ISSUED TO REVISE THE SPECIFICATIONS IN SECTION 6 OF THE SERVICE MANUAL AS FOLLOWS:

PISTON RING GAP (L82 M)

PISTON RING GAP WITH SEGMENT AT 89.0 MM (3.50 IN) 0.25 - 1.27 MM. 0.0098 - 0.05 IN

CRANKSHAFT MAIN BEARING CLEARANCE (L82 M)

CRANKSHAFT MAIN BEARING CLEARANCE (EXCEPT NUMBER 3) 0.019 - 0.064 MM 0.0008 - 0.0025 IN

PISTON PIN (L82 M)

PISTON PIN CLEARANCE IN PISTON 0.0096 - 0.0215 MM 0.0004 - 0.0008 IN

FIGURES: 00 ATTACHMENTS: 00

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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