Chain Length, Checking: Procedure

All except Audi A8:

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

Audi A6/A7 with High-Voltage System:

Fig 1: Audi A6/A7: Lock Carrier Coolant Pipes - Tightening Specification

Courtesy of AUDI OF AMERICA, LLC

-- Remove the bolts -2-, press the coolant pipes -4- to the side.

Audi Q5 with High-Voltage System:

Fig 2: Coolant Pipes On Lock Carrier - Tightening Specification

Courtesy of AUDI OF AMERICA, LLC

-- Remove the left and right bolt -arrow- to do so loosen the bumper cover end plate on the lock carrier. Refer to OVERVIEW - BUMPER COVER .

-- Push the coolant pipes to the side.

Continuation for All Vehicles:

Fig 3: Identifying Plug

Courtesy of AUDI OF AMERICA, LLC

-- Remove the plug -arrow-.

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

Fig 4: 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, 0001 - Chain Length Adaptation Diagnosis  and delete the DTC memory.
• If seven or more teeth are visible: replace the camshaft timing chain.