For 1990-2009 cars

# Accessory Drive Belt Squeak/Chirp Noise (Install Idler Pulley/Gen. Bracket/Belt)

Subject: | Accessory Drive Belt Squeak/Chirp Noise (Install New Double Row Idler Pulley, Generator Bracket and Serpentine Belt)

Models: | 1998-2000 Chevrolet Camaro

| 1998-2000 Pontiac Firebird

| Built Prior to VIN Breakpoint Y2107225 with 5.7 L V8 Engine (VIN G -- RPO LS1)

### Condition

Some customers may comment on a squeak/chirp noise coming from the accessory drive serpentine belt. The noise will be most noticeable at idle and low engine speeds.

### Cause

The serpentine belt squeak/chirp noise may be caused by misalignment between the idler pulley and crankshaft pulley. A slight rocking motion of the idler pulley causes the misalignment, which results in noise.

### Correction

To correct this condition on vehicles built prior to the above VIN breakpoint, install the new generator bracket, double row idler pulley and serpentine belt following Service Manual procedures.

Important: The new generator bracket can be identified by the depth of the idler pulley mounting pilot. The pilot dimension (2) on the new generator bracket is 10 mm. Dimension (2) on the previous bracket was 8.3 mm.

(1) | New Double Row Idler Pulley Assembly
(2) | Idler Pulley Mounting Pilot Dimension

### Parts Information

Part Number | Description
--- | ---
12563326 | Double Row Idler Pulley Assembly
12563327 | Generator Bracket
12562626 | Serpentine Belt

Parts are currently available from GMSPO.

### Warranty Information

For vehicles repaired under warranty, use:

Labor Operation | Description | Labor Time
--- | --- | ---
J0667 | Drive Belt -- Replace | Use Published Labor Times
J0690 | Pulley Assembly, Serpentine Belt Idler -- Replace
J4160 | Bracket, Generator Mounting -- Replace