Timing Chain, Checking

Special tools and workshop equipment required 

• Wrench - 21mm :T40263 
• Adapter :T40314 

If an elongated camshaft timing chain is suspected based on complaints (for example noises), the timing chain can be checked as described in the following.

Procedure 

-- Remove the front noise insulation. Refer to OVERVIEW - NOISE INSULATION .

-- Remove the plug -arrow-. The plugs must be replaced.

Fig 1: Identifying Plug

Courtesy of AUDI OF AMERICA, LLC

Fig 2: Using T40263 & T40314

Courtesy of AUDI OF AMERICA, LLC

-- Turn the crankshaft with :T40263  , :T40314  and a 24 mm socket only in the direction of engine rotation -arrow-.

-- Turn the vibration damper in direction of engine rotation until the chain tensioner piston is extended the maximum distance in direction of -arrow-.

Fig 3: Identifying Vibration Damper

Courtesy of AUDI OF AMERICA, LLC

-- Count the visible piston teeth.

TIP:

The visible teeth are all of the teeth that are located to the right of the chain tensioner housing -arrow-.

• If six or fewer teeth are visible, the timing chain must not be replaced.
• If six or fewer teeth are visible and there is an entry in the DTC memory: adjust the chain length using the Vehicle Diagnostic Tester, 01 - Chain Length Adaptation Diagnosis  and delete the DTC memory.
• If seven or more teeth are visible: replace the camshaft timing chain. Refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .

Tightening Specifications

• Refer to OVERVIEW - NOISE INSULATION .