Rattle/Knocking Noise from Camshaft Adjuster at Engine Start – 1997-2006 Audi

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15 Rattle/knocking noise from camshaft adjuster at engine start

 

15 08 16 2010294/5 November 21, 2008. Supersedes Technical Service Bulletin Group 15 number 07-03 dated July 7, 2007 for reasons listed below.

 

Model(s) Year VIN Range Vehicle-Specific Equipment
TT 2000 – 2006 All 1.8T Engine
A4 1997 – 2005 All
A4 1998 – 2001 All 2.8 V6 Engine
A4 2000 – 2002 All 2.7T V6 Engine
A4 2002 – 2006 All 3.0 V6 Engine
A4 Cabriolet 2002 – 2006 All
A4 Cabriolet 2003 – 2006 All 1.8T Engine
A6 1998 – 2001 All 2.8 V6 Engine
A6 2000 – 2004 All 2.7T V6 Engine
A6 2002 – 2004 All 3.0 V6 Engine
A6 2000 – 2004 All 4.2 V8 Engine
allroad 2001 – 2005 All 2.7T V6 Engine
A8 2001 – 2003 All 4.2 V8 Engine
A8 1997 – 1999 All 3.7 V8 Engine
A8 1997 – 1999 All 4.2 V8 Engine
A8 2006 All

 

Condition

REVISION HISTORY
Revision Date Purpose
5 Revised Title to include Repair Group

 

Rattle or knocking noise from camshaft chain tensioner(s) or camshaft adjuster(s) for 1-2 seconds after engine start.

 

Technical Background

The camshaft adjustment is hydraulically actuated and controlled by the engine oil pressure. If the engine has been turned off for a long time, the oil pressure drops down and the oil partially flows back into the oil sump.

To ensure an efficient camshaft adjustment right after an engine cold start, the oil pressure inside the camshaft adjusters must be built up as fast as possible. During this time, a rattle or knocking noise may be noticeable.

This noise is normal at engine start and will last until the oil pressure is fully built up, which takes about 1-2 seconds.

 

 

Service

Do not replace the Camshaft Tensioner(s) or Camshaft Adjuster(s) for a noise concern as described above.

Replacing the Camshaft Tensioner(s) or Camshaft Adjuster(s) will not eliminate this noise.

 

Warranty

This TSB is informational only and not applicable to any Audi warranty.

 

All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.

 

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