A4 Mk2
Valve gear - exploded view of components |
Note
t | After installing camshafts, wait for approx. 30 minutes before starting engine. Hydraulic valve compensation elements have to settle (otherwise valves will strike pistons). |
t | After working on the valve gear, turn the engine carefully at least 2 rotations by hand to ensure that none of the valves make contact when the starter is operated. |
t | The following illustration shows the left-side cylinder head. |
1 - | Camshaft bearing caps |
q | Installation position → Fig. |
q | Before fitting, apply sealant to sealing surfaces of outer bearing caps → Chapter |
q | Installation sequence → Chapter |
2 - | Cap nut, 15 Nm |
q | Renew seals when fitting |
3 - | 10 Nm |
4 - | Cap nut, 15 Nm |
q | Renew seals when fitting |
5 - | Nut, 10 Nm |
6 - | 10 Nm |
7 - | Camshaft bearing caps |
q | Installation position → Fig. |
q | Installation sequence → Chapter |
8 - | Inlet camshaft |
q | Checking axial clearance → Chapter |
q | Removing and installing → Chapter |
q | Check radial clearance with Plastigage (rocker fingers removed) |
q | Radial clearance when new: 0.035 ... 0.085 mm; Wear limit 0.10 mm |
q | Runout: max. 0.04 mm |
9 - | Exhaust camshaft |
q | Checking axial clearance → Chapter |
q | Removing and installing → Chapter |
q | Check radial clearance with Plastigage (rocker fingers removed) |
q | Radial clearance when new: 0.035 ... 0.085 mm; Wear limit 0.10 mm |
q | Runout: max. 0.04 mm |
10 - | Hydraulic valve compensation element |
q | Mark installation position with a coloured pen |
q | Checking → Chapter |
q | Lubricate contact surface before fitting |
11 - | 10 Nm |
12 - | Exhauster pump for brake servo |
q | Removing and installing → Fig. |
q | Renew O-rings |
13 - | Thrust washers |
q | 2x |
14 - | Cylinder head |
q | Removing: left-side → Chapter; right-side → Chapter |
q | Installing → Chapter |
q | Valve seats are not to be re-worked |
15 - | Exhaust valve |
q | Checking → Chapter |
q | Valve dimensions → Chapter |
q | Remove and install with cylinder head removed using valve spring compressor -2037- |
16 - | Inlet valve |
q | Checking → Chapter |
q | Valve dimensions → Chapter |
q | Remove and install with cylinder head removed using valve spring compressor -2037- |
17 - | Oil seal |
q | Renewing → Chapter |
18 - | Camshaft sprocket |
19 - | 75 Nm |
20 - | Valve stem oil seal |
q | Renewing valve stem oil seals with cylinder head installed → Chapter |
q | Renewing valve stem oil seals with cylinder head removed → Chapter |
21 - | Valve spring |
22 - | Valve spring plate |
23 - | Valve cotters |
24 - | Hydraulic valve compensation element |
q | Mark installation position with a coloured pen |
q | Checking → Chapter |
q | Lubricate contact surface before fitting |
25 - | Guide for rocker finger |
26 - | Rocker finger |
q | Mark installation position with a coloured pen |
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Component | Nm |
Exhauster pump to cylinder head | 10 |