Timing Chain, Checking

Special tools and workshop equipment required 

• Wrench - 21mm: T40263 
• Adapter: T40314 
• Vehicle Diagnostic Tester - Test Adapter - 3 Pin: VAS5570 

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 

Preliminary work may be required depending on the model. Refer to TIMING CHAIN, CHECKING .

-- 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 crankshaft 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 : VAS5570  , 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 .

There are additional procedures depending on the model. Refer to TIMING CHAIN, CHECKING .