Valve Timing, Correcting:

Fig 1: Identifying Crankshaft Lock T10490

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-- If the camshaft hub cannot be secured, pull the Crankshaft Lock: T10490 back until the pin is free from the hole.

-- Turn the crankshaft opposite the direction of engine rotation just past "TDC".

-- Slowly turn the crankshaft in the direction of engine rotation until the camshaft hub is secured.

Fig 2: Identifying Diesel Injection Pump Locking Pin

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-- Loosen the bolt on the camshaft toothed belt sprocket.

Procedure if the Crankshaft Lock: T10490 is now to the left of the hole:

Fig 3: Identifying Crankshaft Lock T10490

Courtesy of AUDI OF AMERICA, LLC

-- Turn the crankshaft in direction of engine rotation, until the pin -arrow- on the crankshaft stop fits into the sealing flange.

-- Tighten the camshaft toothed belt sprocket bolt to 20 Nm.

Procedure if the Crankshaft Lock: T10490 is now to the right of the hole:

Fig 4: Identifying Crankshaft Lock T10490

Courtesy of AUDI OF AMERICA, LLC

-- Turn the crankshaft slightly opposite the direction of engine rotation.

-- Turn the crankshaft again in direction of engine rotation, until the pin on the crankshaft stop fits into the sealing flange from the rotational movement.

-- Tighten the camshaft toothed belt sprocket bolt to 20 Nm.