Foreign Objects In Engine

To prevent foreign objects from entering when working on the engine, open intake and exhaust tract channels must always be sealed off with suitable plugs, for example from the Engine Bung Set: VAS 6122 .

Fig 1: Engine Bung Set
Courtesy of AUDI OF AMERICA, LLC
If mechanical damage to a cylinder bank is found, check the intake and exhaust tract and the combustion chambers in the opposite cylinder bank for foreign objects to prevent subsequent damage.
If there is mechanical damage to the turbocharger. Refer to Mechanical Damage .