Audi Workshop Service and Repair Manuals

Checking valve timing

Special tools and workshop equipment required

t	Spark plug socket and extension -3122 B-

t	Torque wrench -V.A.G 1331-

t	Dial gauge -VAS 6079-

t	Puller -T10094-

t	Adapter for dial gauge -T10170-

t	Camshaft clamp -T10171-

Test sequence l  Engine in vehicle. –  Unclip air intake hose from air duct -arrows-.

–  Unplug electrical connector at intake air temperature sender 2 -G299--item 2-. –  Detach vacuum hose -1- from actuator for intake air preheater.

–  Pull dipstick -1- out of guide tube. –  Remove the engine cover together with air cleaner housing -arrows-. –  Re-insert dipstick in guide tube.

–  Remove exhaust gas recirculation valve -N18- → Chapter. –  Unscrew bolts -arrows-. –  Detach sealing caps -1- and -2-.

–  Apply puller -T10094- at ignition coil for cylinder 1 -arrow- and pull out ignition coil.   Note The assembly tool -T10118- is only required if the electrical connector needs to be unplugged. –  Remove spark plug for cylinder 1 with spark plug socket and extension -3122 B-.

–  Screw adapter for dial gauge -T10170- into spark plug hole as far as the stop. –  Insert dial gauge -VAS 6079- with extension -T10170/1- as far as the stop and secure using locking nut -arrow-. –  Turn crankshaft in normal direction of rotation to TDC position. Note the position of the small dial gauge needle.

l  The holes -arrows- in the camshafts must be positioned as shown in illustration; turn crankshaft another full rotation (360°) if necessary.   Note t  If the crankshaft is more than 0.01 mm beyond TDC, you must turn the crankshaft approx. 45° in opposite direction of rotation. Then turn crankshaft in normal direction of rotation to TDC. t  Permissible deviation from TDC: ± 0.01 mm.

–  Insert the camshaft clamp -T10171- into the openings in the camshafts as far as the stop. l  The locking pins -arrows 1- must engage in the holes -arrows 2-. The marking “TOP”-arrow 3- should be legible from above. If the camshaft clamp -T10171- cannot be inserted into the openings in the camshafts as far as the stop, the valve timing is not correct. –  Adjust the valve timing → Chapter „Removing and installing camshaft timing chain“. Assembling   Note Renew gaskets and seals. Installation is carried out in the reverse order; note the following: –  Renew seals for camshaft sealing caps and lubricate with oil before installing. –  Install exhaust gas recirculation valve -N18- → Chapter. Tightening torque

Component	Nm
Sealing caps to camshaft housing	10