Laser Assisted Belt Alignment

The available EN-49228 Laser Belt Alignment Tool is simple to use and time-saving (fig. 1). Use it to assist in achieving precise alignment of the drive belt pulleys. Using it removes the guesswork from proper pulley alignment and may serve to reduce comebacks from:

- Drive belt noise

- Accelerated drive belt wear

- Drive belt slippage

INSTRUCTIONS

TIP: These instructions from bulletin 08-06-01-008 are specific to the truck Gen IV V-8 family of engines. Universal instructions are included in the kit.

CAUTION:

- Do not look directly into the beam projected from the laser.

- Use caution when shining the laser on highly polished or reflective surfaces. Laser safety glasses help reduce laser beam glare in many circumstances.

- Always use laser safety glasses when using the laser. Laser safety glasses are not designed to protect eyes from direct laser exposure.

1. Observe and mark the serpentine belt orientation.

2. Remove the serpentine belt from the accessory drive system.

3. Install the tool onto the power steering pulley. Position the legs of the tool into the outer grooves of the pulley, farthest from the front of the engine.

4. Install the retaining cord around the pulley and to the legs of the tool.

5. Put on the laser safety glasses provided with the tool.

6. Depress the switch on the rear of the tool to activate the light beam.

7. Rotate the power steering pulley as required to project the laser beam onto the crankshaft balancer pulley grooves (fig. 2).

8. Inspect for proper power steering pulley alignment.

- If the laser beam projects onto the second rib or raised area, the pulleys are aligned properly.

- If the laser beam projects more than one-quarter rib 0.9 mm (0.035 in) mis-alignment, adjust the position of the power steering pulley as required.

- Refer to SI for Power Steering Pulley Removal and Installation procedures.

9. Install the serpentine belt to the accessory drive system in the original orientation.

10. Operate the vehicle and verify that the belt noise concern is no longer present.

PARTS INFORMATION

Contact 1-800-GM-TOOLS or http://gmspecialservicetools.spx.com for information or to order this tool.

- Thanks to Ron Minoletti