Audi Workshop Service and Repair Manuals

Removing and installing balance shaft assembly with chain drive Special tools and workshop equipment required

t  Locking pin -T10115-

t  Locking tool -T10255-

Removing –  Remove sump → Chapter. –  Rotate crankshaft to TDC → Chapter and lock crankshaft using crankshaft stop -T10050- for engines with circular crankshaft sprocket, or crankshaft stop -T10100- for engines with oval crankshaft sprocket. –  Unscrew bolts -arrows- and detach chain sprocket cover.

–  Press guide rail for chain tensioner in -direction of arrow- using a screwdriver and lock chain tensioner with locking pin -T10115-. Remove bolts -1- and -3-.   Note Disregard -item 2-.

–  Unscrew bolts -arrows- and detach chain sprocket from balance shaft.

–  Unscrew bolts in the sequence -8 ... 1- and remove balance shaft assembly with oil pump.   Note If the chain drive of the balance shaft assembly is worn or defective, the chain drive must be converted to spur gear drive. → Chapter Installing   Note Renew the bolts tightened with specified tightening angle. l  Crankshaft is locked at TDC using crankshaft stop -T10050- for engines with circular crankshaft sprocket, or crankshaft stop -T10100- for engines with oval crankshaft sprocket. l  Chain sprocket fitted into drive chain for balance shaft. –  Make sure both dowel sleeves are in place before installing balance shaft assembly. –  Initially screw bolts -1 ... 8- in finger-tight.

–  Lock balance shaft with locking tool -T10255-. l  The lug of the locking tool must engage in the groove of the balance shaft.

–  Bolt on chain sprocket for balance shaft loosely -arrows-. l  It must still be possible to move the chain sprocket back and forth in the elongated holes.   Note If it is not possible to align the elongated holes in the chain sprocket with the threaded holes, the chain sprocket must be moved one tooth further in the drive chain. The balance shaft assembly must be removed again for this procedure.

–  Tighten bolts securing balance shaft assembly as follows: 1.  Pre-tighten bolts in the sequence -1 ... 8- to 6 Nm. 2.  Tighten bolts -5- and -7- to 13 Nm. 3.  Turn bolts -5- and -7- 90° further (1/4 turn) using a rigid wrench. 4.  Tighten bolts -1 ... 4-, -6- and -8- to 20 Nm. 5.  Turn bolts -1 ... 4-, -6- and -8- 90° further (1/4 turn) using a rigid wrench.

–  Tighten bolts -1- and -3-.   Note Disregard items marked -2- and -arrow-. –  Remove locking pin -T10115- from chain tensioner.

–  Insert locking tool -T10255- in balance shaft again to secure chain sprocket. l  The lug of the locking tool must engage in the groove of the balance shaft.

–  Tighten bolts -arrows-. –  Remove locking tool -T10255-.

–  Fit chain tensioner cover -arrows-. –  Detach crankshaft stop.

–  Install toothed belt cover (bottom and centre) -arrows-. Remaining installation steps are carried out in reverse sequence; note the following: –  Install sump → Chapter. –  Install vibration damper → Chapter. –  Fill up with engine oil and check oil level → Booklet803 or → Booklet805. Tightening torques

Component			Nm
Balance shaft assembly		M7	13 + 90° 1)2)
to cylinder block		M8	20 + 90° 1)2)
Chain tensioner to balance shaft assembly			9
Chain sprocket to balance shaft			10 + 90° 1)2)
Cover for	Chain tensioner		5 3)
chain sprocket to:	Oil pump		5 3)
Toothed belt cover to engine			10 3)
l  1) Renew bolts. l  2) 90° = one quarter turn. l  3) Apply locking fluid when installing; refer to → Electronic parts catalogue for locking fluid.