For 1990-2009 cars

# SMU-SECTION 6A -REV.PROC FOR INSTALL AND TORQUING

#### SUBJECT: SERVICE MANUAL UPDATE - SECTION 6A - REVISED PROCEDURE FOR INSTALLATION AND TORQUING OF CYLINDER HEAD BOLTS

#### MODELS: 1997 BUICK SKYLARK 1997 CHEVROLET CAVALIER, MALIBU 1997 OLDSMOBILE ACHIEVA 1997 PONTIAC GRAND AM, SUNFIRE WITH 2.4L ENGINE (VIN T - RPO LD9)

THIS BULLETIN IS BEING ISSUED TO REVISE THE SERVICE PROCEDURE FOR INSTALLATION AND TORQUING OF THE CYLINDER HEAD BOLTS IN SECTION 6A OF THE SERVICE MANUAL.

THE SERVICE MANUAL INCORRECTLY STATES THE TORQUE ANGLE PROCEDURE USED TO TIGHTEN THE CYLINDER HEAD BOLTS.

THE INSTALLATION PROCEDURE SHOULD READ AS FOLLOWS:

- INSTALL THE CYLINDER HEAD GASKET TO THE BLOCK.

#### IMPORTANT:

DO NOT USE ANY SEALING MATERIAL.

- INSTALL THE CYLINDER HEAD.

- LIGHTLY APPLY CLEAN ENGINE OIL TO THE THREADS AND THE BOTTOM SIDE OF THE FLANGE OF THE HEAD BOLT AND ALLOW THE OIL TO DRAIN BEFORE INSTALLING.

- INSTALL AND TIGHTEN THE CYLINDER HEAD BOLTS IN SEQUENCE.

- TIGHTEN

TIGHTEN BOLTS 1-8 TO 65 N.M (40 LB FT).

TIGHTEN BOLTS 9 AND 10 TO 40 N.M (30 LB FT).

- THEN TURN ALL BOLTS AN ADDITIONAL 90 DEGREES IN SEQUENCE (THIS REPLACES STEP 6 IN THE SERVICE MANUAL).

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.

COPYRIGHT 1997 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.