SMU-SECTION 6B - BELT TENSIONS REPLACE. GMC Truck GMC MD Bus Chassis (B Model) 1997

SUBJECT: SERVICE MANUAL UPDATE-SECTION 6B- BELT TENSIONS - REPLACE STEP 2 OF INSTALLATION

MODELS: 1997 GMC B TRUCK W/ L65 MODELS

THIS BULLETIN REPLACE STEP 2 OF INSTALLATION OF "FAN DRIVE BELT (6.5L) DIESEL ENGINE" OF PAGE 6B-36 OF THE 1997 MEDIUM DUTY TRUCK C-SERIES AND B7 CHASSIS SERVICE MANUAL WITH THE FOLLOWING:

2. TIGHTEN THE ADJUSTER BOLT UNTIL THE FOLLOWING TENSION IS ACHIEVED:

* NEW BELT - 230 LBS +/- 10 LBS (312 +/- 13.5 NM) BEFORE INITIAL ROTATIONS OF PULLEYS. * USED BELT - 220 LBS +/- 10 LBS (298 +/- 13.5 NM) BEFORE INITIAL ROTATIONS OF PULLEYS. * MINIMUM BELT TENSION OF 180 LBS (244 NM) AFTER ROTATION OF PULLEYS.

DEFINITION OF USED BELT: NEW BELT THAT HAS BEEN TENSIONED ONE TIME AND HAS BEEN ROTATED ONE REVOLUTION. RESET TENSION TO 220 LBS (298 NM) IF TENSION IS LESS THAN 100 LBS (135 NM).

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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