A8L V8-4.2L (BFM) (2004)
Idler Pulley: All Technical Service Bulletins
Engine - Whirring Noise From Front Of Engine
27 Engine makes whirring noise
13 10 04
2016702/5
June 24, 2010
Supersedes Technical Service Bulletin Group 13 number 10-01 dated June 1, 2010 for reasons listed below.
Affected Vehicles
Condition
Whirring noise from front of engine.
Technical Background
May be caused by dirt and water entering ribbed belt upper idler roller bearing.
Production Solution
Improved upper idler roller with bearing cap.
Service
1. Ensure all components (such as ribbed v-belt, belt tensioner, generator, vibration damper, A/C compressor, power steering pump and lower idler
roller) are correct and aligned properly. Replace the idler roller only if the other components are correct and aligned properly.
2. Open hood and check existing roller. If plastic upper idler roller with cap is already installed, the vehicle has already been updated and no further
work is necessary.