Audi Workshop Service and Repair Manuals

Removing and installing drive chain for auxiliary drives Special tools and workshop equipment required

t  Special wrench -T40049-

t  Locking pin -T40069-

t  Locking pin -T40071-

t  Locating pins -T40116- Removing l  Gearbox removed → Rep. gr.34. –  Remove timing chain cover (bottom) → Chapter.

Caution Risk of damage to drive chain if thread of bolt exceeds specified length. t  Use bolts with a maximum thread length -a- of 22 mm to attach special wrench -T40049-. t  If no suitable bolts are available, position suitable washer(s) under bolt head so that remaining thread length does not exceed 22 mm.

–  Attach special wrench -T40049- at rear end of crankshaft using 2 bolts -arrows-.

–  Remove plug -arrow- for crankshaft „TDC“ marking from cylinder block. –  Rotate crankshaft in normal direction of rotation to „TDC“.

–  Screw locking pin -T40069- into hole (20 Nm); if necessary, turn crankshaft -1- backwards and forwards slightly to fully centralise locking pin.

–  Press guide rail of chain tensioner in direction of -arrow- and lock chain tensioner by inserting locking pin -T40071-.   Caution If a used drive chain rotates in the opposite direction when it is refitted, this can cause breakage. Mark running direction of drive chain with paint for re-installation. Do not attempt to mark the drive chain with a centre punch or by making a notch or similar. –  Unscrew bolts -3- and detach chain sprocket from balance shaft. –  Remove bolts -1- and -2- and take off chain tensioner with chain.

Installing l  Tightening torques → Chapter „Drive chain for auxiliary drives - exploded view“ l  Crankshaft -1- locked in „TDC“ position with locking pin -T40069-.

–  Install chain tensioner with chain and balance shaft sprocket. –  Lock balance shaft in „TDC“ position using locating pin -T40116-. l  The elongated holes in the balance shaft sprocket must be aligned centrally over the threaded holes in the balance shaft. If necessary move chain one tooth further. –  Tighten bolts for chain tensioner. –  Fit bolts -1- for chain sprocket without tightening. l  It should just be possible to turn the sprocket on the balance shaft without axial movement. –  Pull out locking pin -T40071- to release chain tensioner. –  Press against guide rail of chain tensioner -arrow- using a screwdriver, and at the same time tighten bolts -1- securing chain sprocket. –  Pull locating pin -T40116- out of balance shaft. Remaining installation steps are carried out in reverse sequence; note the following: –  Install timing chain cover (bottom) → Chapter. –  Install plug for crankshaft „TDC“ mark → Fig..