Accessory Drive Belt - Slip/Squeal/Squeak
File In Section: 6 - EngineBulletin No.: 87-61-23
Date: May, 1998
Subject:
Accessory Belt Noise/Squeal
(Diagnose/Replace Applicable Part)
Models:
1998 Chevrolet Camaro
1998 Pontiac Firebird
with 5.7L V8 Engine (VIN G - RPO LS1)
Condition
Some owners of the above listed vehicles may comment on an accessory drive belt slip, squeal and/or squeak.
Cause
This condition may be caused by one, or all of the following:
^ Incorrect Power Steering Pump Pulley installed.
^ Incorrect Main Accessory Drive Belt routing.
^ Main Accessory Drive Belt not centered in all accessory pulleys. (Ribs in belt not lined up with groves in the pulleys.)
^ Harmonic Balancer positioned too close to the engine. This may be caused by the engine side of the Harmonic Balancer Hub being mis-machined.
Correction
Check to ensure the vehicle has the correct P/S Pump Pulley (Correct P/N is 12559885). The part number appears on the web of the pulley in raised characters. This pulley is all plastic except for the inner hub that is connected to the P/S Pump Shaft. If the incorrect pulley is installed, replace the pulley along with a new Main Accessory Drive Belt. Use part numbers listed.
If the Main Accessory Drive Belt is not centered in all pulleys, check for proper alignment of all the accessory pulleys. If all pulleys are aligned, replace the Main Accessory Drive Belt and center the belt in all the pulleys.
At the Harmonic Balancer, the Main Accessory Drive Belt may be tracking too far rearward (approximately 3 mm, 1/8 in.) in relationship to all other pulleys.
If this condition is present, replace the Harmonic Balancer and Harmonic Balancer Bolt along with the Main Accessory Drive Belt and the A/C Compressor Drive Belt. All part numbers are listed.
Important:
If it is determined there is a Main Accessory Drive Belt, or A/C belt noise coming from the Harmonic Balancer area it is highly likely the Harmonic Balancer needs to be replaced.
Parts Information
Part Number Description
12559885 P/S Pulley
12557562 Accessory Drive Belt
12553118 Harmonic Balancer
12557840 Harmonic Balancer Bolt
12559327 A/C Compressor Drive Belt
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use table:
Labor Operation Description Labor Time
E8360 Pulley Replace 0.6 hr
J0667 Main Drive Belt Replace 0.2 hr
J0710 Harmonic Balancer Replace 0.3 hr