A4 Mk2
| Valve gear - exploded view of components |
| 1 - | 50 Nm + turn 90° further |
| q | Renew |
| q | Use counterhold tool -3036- when loosening and tightening |
| 2 - | Camshaft sprocket |
| q | Installation position fixed by parallel key |
| q | Removing and installing → Chapter „Renewing exhaust camshaft oil seal“ |
| 3 - | Oil seal for exhaust camshaft |
| q | Renewing → Chapter |
| 4 - | Cylinder head |
| q | See note → Chapter |
| q | Checking valve guides → Chapter |
| 5 - | Roller rocker finger with supporting element |
| q | Do not interchange used roller rocker fingers (mark) |
| q | Check roller bearing for play and ease of movement |
| q | Lubricate contact surfaces before installing |
| q | Use retaining clip to clip onto supporting element when installing |
| q | Checking supporting element with hydraulic clearance compensation → Chapter |
| 6 - | Parallel key |
| q | Check for firm attachment |
| 7 - | Exhaust camshaft |
| q | Removing and installing → Chapter |
| q | Checking axial clearance → Chapter |
| q | Check radial clearance with Plastigage (roller rocker fingers removed) |
| q | Radial clearance when new: 0.035 ... 0.085 mm; Wear limit 0.10 mm |
| q | Runout: max. 0.035 mm |
| 8 - | Retaining frame |
| q | With integrated camshaft bearings |
| q | Clean sealing surface; machining not permitted |
| q | Remove old sealant residues |
| 9 - | 8 Nm + 90° (1/4 turn) further |
| q | Renew |
| q | Tightening sequence → Anchor |
| 10 - | Camshaft adjuster |
| q | Removing and installing → Chapter |
| 11 - | 100 Nm |
| q | Use special wrench (long reach) -T40080- with counterhold tool -3036- to loosen and tighten |
| 12 - | Inlet camshaft |
| q | Removing and installing → Chapter |
| q | Checking axial clearance → Chapter |
| q | Check radial clearance with Plastigage (roller rocker fingers removed) |
| q | Radial clearance when new: 0.035 ... 0.085 mm; Wear limit 0.10 mm |
| q | Runout: max. 0.035 mm |
| 13 - | Chain tensioner |
| q | Before removing, lock in place using tensioning bolt -T10092- |
| 14 - | Drive chain |
| q | Removing and installing → Chapter „Removing and installing camshafts“ |
| 15 - | 10 Nm |
| 16 - | Cotters |
| 17 - | Valve spring plate |
| 18 - | Valve spring |
| q | Removing and installing with cylinder head installed → Chapter „Renewing valve stem oil seals“ |
| q | Remove and install with cylinder head removed using valve spring compressor -2037- |
| 19 - | Valve stem oil seal |
| q | Renewing → Chapter |
| 20 - | Sealing sleeve for valve guide |
| q | Depending on version |
| q | Do not remove |
| q | Do not remove sealant |
| 21 - | Valve guide |
| q | Checking → Chapter |
| 22 - | O-ring |
| q | Renew |
| 23 - | 10 Nm |
| 24 - | Hall sender -G40- |
| q | Renew O-ring |
| 25 - | Exhaust valve |
| q | Do not machine, only grinding-in is permitted |
| q | Valve dimensions → Chapter |
| q | Checking valve guides → Chapter |
| 26 - | Inlet valve |
| q | Do not machine, only grinding-in is permitted |
| q | Valve dimensions → Chapter |
| q | Checking valve guides → Chapter |
| 27 - | Sealing cap |
| q | Renew |
| q | Removing sealing cap with retaining frame installed: pierce on one side with an awl and pry out |
| q | Installing: do not use sealant; press in until flush using suitable drift |
