Horrible pulley squeal!
09-18-2005 | 11:25 AM
#1
Horrible pulley squeal! I have an annoying squeek coming from under my hood. It lessens above 2200 RPMs and worsens when the AC is on or when it is wet out. At idle it is very loud. I have tried belt dressing to no avail. I am wondering if this is a precursor to a water pump or P/S unit about to go out? Any advice is welcome! Thanks!
09-18-2005 | 10:20 PM
#3
TECH Veteran
Joined: Dec 2004
Posts: 4,012
Likes: 1
From: Beaumont, TX
If your car is still under warranty, looks like they'll do it for free; otherwise, probably not. It's a small labor time, though, so it'd probably be fairly cheap 
Here is the TSB:
Here is the TSB:
Technical - Accessory Drive Squeak (Replace Idler Pulley) #99-06-01-007
1997 - 1999 Chevrolet Corvette
1998 - 1999 Chevrolet Camaro
1998 - 1999 Pontiac Firebird
with 5.7 L Engine (VIN G - RPO LS1)
Condition:
Some customers may comment on a squeak noise coming from the engine or accessory drive while the engine is running. This squeak may vary in volume and may be heard inside the vehicle with the windows up and the radio on.
Cause:
The idler pulley dust shield may distort during assembly due to torquing of the mounting bolt. This distortion may cause the idler pulley dust shield to contact the bearing race and the pulley resulting in the squeak noise.
Correction:
A new idler pulley assembly is available with a thicker dust shield to prevent the distortion of the dust shield. The previous dust shield thickness is 0.61 mm. The new dust shield thickness is 1.37 mm.
Important:
Do not over-torque the mounting bolt or the condition may reoccur.
Do not use pneumatic or electric tools for installation of the idler pulley assembly.
Tighten:
Torque the idler pulley bolt to 50 N·m (37 lb ft).
Parts Information:
Part Number: 12564401
Description: Idler Pulley Assembly
Parts are currently available from GMSPO.
Warranty Information:
For vehicles repaired under warranty, use:
Labor Operation: J0690
Description: Pulley Assembly, Serpentine Belt Idler - Replace
Labor Time: 0.3
1997 - 1999 Chevrolet Corvette
1998 - 1999 Chevrolet Camaro
1998 - 1999 Pontiac Firebird
with 5.7 L Engine (VIN G - RPO LS1)
Condition:
Some customers may comment on a squeak noise coming from the engine or accessory drive while the engine is running. This squeak may vary in volume and may be heard inside the vehicle with the windows up and the radio on.
Cause:
The idler pulley dust shield may distort during assembly due to torquing of the mounting bolt. This distortion may cause the idler pulley dust shield to contact the bearing race and the pulley resulting in the squeak noise.
Correction:
A new idler pulley assembly is available with a thicker dust shield to prevent the distortion of the dust shield. The previous dust shield thickness is 0.61 mm. The new dust shield thickness is 1.37 mm.
Important:
Do not over-torque the mounting bolt or the condition may reoccur.
Do not use pneumatic or electric tools for installation of the idler pulley assembly.
Tighten:
Torque the idler pulley bolt to 50 N·m (37 lb ft).
Parts Information:
Part Number: 12564401
Description: Idler Pulley Assembly
Parts are currently available from GMSPO.
Warranty Information:
For vehicles repaired under warranty, use:
Labor Operation: J0690
Description: Pulley Assembly, Serpentine Belt Idler - Replace
Labor Time: 0.3
09-19-2005 | 08:10 AM
#4
TECH Fanatic
Joined: Apr 2005
Posts: 1,231
Likes: 1
From: Just This Side of Damnation
The idler and tensioner pulleys are cheaply and easily replaced or repacked. I replaced the idler pulley on mine and the squeal went away.
I guess I could have repacked it, as was mentioned to me by a forum member, but I went ahead and got a new one since it was so cheap.
I guess I could have repacked it, as was mentioned to me by a forum member, but I went ahead and got a new one since it was so cheap.
