Audi Workshop Service and Repair Manuals

Removing and installing camshaft timing chain Special tools and workshop equipment required

t  Counterhold tool -T10355-

t  Assembly tool -T10352/2-

t  Locking pin -T40011- t  Locking tool -T40267- t  Assembly tool -T40266- Removing –  Remove front end → Rep. gr.50. –  Remove timing chain cover (top) → Chapter.

Caution The timing valves have a left-hand thread. –  Turn assembly tool -T10352/2- in direction of -arrow- to remove timing valve (left and right sides).

–  Remove bolts -arrows- and detach bearing saddle.

–  Turn vibration damper to „TDC“ position -arrow- using counterhold tool -T10355-. l  Notch on vibration damper must align with arrow marking on cover for timing chains (bottom). l  The markings -1- on the camshafts must face upwards. –  Remove timing chain cover (bottom) → Chapter.

–  Press retainer for oil pump chain tensioner in direction of -arrow- and lock in place using locking pin -T40011-. –  Remove oil pump chain tensioner -1-.

–  Compress circlip -arrow- for chain tensioner. –  Press tensioning rail for timing chain in direction of -arrow- and lock in place using locking tool -T40267-. –  Remove camshaft timing chain from camshaft sprockets and place onto camshaft journals.   Note The camshafts will move suddenly in direction of engine rotation.

–  Remove tensioning rail for timing chain -2-. –  Remove guide rail for camshaft timing chain -1-.

–  Remove chain tensioner for balance shaft timing chain -1-. –  Remove tensioning rail -2-. –  Remove guide rail -4-.

–  Remove bolt -arrow- for vibration damper. –  Remove sprockets; to do so, remove oil pump chain. –  Detach camshaft timing chain. Installing l  Tightening torques → Chapter „Camshaft timing chain - exploded view“

–  Check TDC position of crankshaft; the marks -arrows- should be aligned. –  Use a waterproof pen to mark cylinder block -1-.

–  Mark tooth of drive chain sprocket -1- adjacent to marking -2- using waterproof pen.

–  Turn idler gear/balance shaft to markings -arrow-.   Note

The links of the drive chain for balance shafts with coloured markings must be positioned at the markings on the chain sprockets. –  Fit drive chain for balance shafts; links with coloured markings -arrows- must be positioned at markings on chain sprockets.

–  Fit camshaft timing chain so that markings -arrows- are positioned on camshaft journals.

–  Fit oil pump chain onto sprocket. –  Pivot sprocket towards engine in direction of -arrow- and lock onto crankshaft. The marks -arrows- must align.

–  Fit thrust piece -T10368- with bolt -arrow- for vibration damper.

–  Fit guide rail for drive chain for balance shafts and tighten bolts -arrows-.

–  Position link of drive chain for balance shafts with coloured marking -arrow- at marking on chain sprocket; fit tensioning rail for timing chain and tighten bolt -1-.

–  Apply locking fluid and fit chain tensioner for timing chain -1-; for locking fluid refer to → Electronic parts catalogue.

–  Check position again; timing chain links with coloured markings must be positioned at markings on chain sprockets.

Note t  The following procedure must be performed in continuous sequence. This requires the assistance of a 2nd person. t  The camshaft timing chain links with coloured markings must be positioned at the markings on the chain sprockets. –  Position camshaft timing chain links with coloured markings at markings on camshaft chain sprockets; to do so, turn camshafts using assembly tool -T40266-. –  Fit camshaft timing chain link with coloured marking onto marking on chain sprocket of bottom sprocket assembly.

–  Fit tensioning rail for timing chain and tighten bolt -2-. –  Fit guide rail for camshaft timing chain and tighten bolts -1-.

–  Attach bearing saddle and screw in bolts -arrows- hand-tight. –  Remove locking tool -T40267-. –  Tighten bolts -arrows- for bearing saddle → Chapter. –  Install timing valves → Item. Further assembly is basically carried out in reverse order of dismantling. Note the following: –  Install timing chain cover (bottom) → Chapter. –  Install timing chain cover (top) → Chapter. –  Install poly V-belt tensioner → Chapter. –  Install poly V-belt → Chapter. –  Install front end → Rep. gr.50. –  Install front bumper and bumper cover → Rep. gr.63.