MANUAL UPDATE-SEC. 6A SERPENT. BELT TENSIONER SERVICE PROC.

VEHICLES AFFECTED: 1988-89 2.5L,A-CAR, 1990 LUMINA

When servicing the serpentine belt tensioner, use the following procedures:

Remove or Disconnect

1. Drain coolant, refer to (Section 6B) of the Service Manual.

2. Drive belt.

3. Bolts securing power steering pump to tensioner assembly.

- Position power steering pump aside.

4. Tensioner to engine attaching bolts.

5. Tensioner

Clean

- Sealing surfaces of tensioner and block, including LIM ring (Figure 1). DO NOT damage or remove seal.

- If there is damage to LIM seal to where it won't seal, or the seal is missing, replace the tensioner.

Install or Connect

1. Position tensioner on engine block.

2. Tensioner to engine attaching bolts.

Tighten

- Bolts to 50 N.m (37 ft.lbs.)

3. Power steering pump to tensioner assembly.

Tighten

- Bolt to 27 N.m (20 ft.lbs.)

4. Serpentine drive belt.

5. Fill coolant system, refer to (Section 6B) of the Service Manual.

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.