A5
Valve gear (1.8 ltr. engine) - exploded view |
1 - | Exhaust valve |
q | Do not machine, only grinding-in is permitted |
q | Valve dimensions → Fig. |
q | Checking valve guides → Chapter |
2 - | Cylinder head |
3 - | Valve guide |
q | Checking → Chapter |
4 - | Valve stem oil seal |
q | Renewing: with cylinder head installed → Chapter, with cylinder head removed → Chapter |
5 - | Valve spring |
6 - | Valve spring plate |
7 - | Valve cotters |
8 - | Hydraulic compensation element |
q | Do not interchange |
q | Lubricate contact surface |
9 - | Exhaust camshaft |
q | Removing and installing → Chapter |
q | Check radial clearance with Plastigage (roller rocker fingers removed) |
q | Radial clearance: 0.024 ... 0.066 mm |
q | Runout: max. 0.04 mm |
10 - | Cylinder head cover |
q | With integrated camshaft bearings |
q | Clean sealing surface; machining not permitted |
q | Remove old sealant residues |
11 - | Bolt |
q | Renew |
q | Slackening → Fig. |
q | Tightening sequence → Fig. |
12 - | O-ring |
q | Renew |
q | Lubricate with engine oil |
13 - | Sealing plug |
14 - | Inlet camshaft |
q | Removing and installing → Chapter |
q | Check radial clearance with Plastigage (roller rocker fingers removed) |
q | Radial clearance: 0.024 ... 0.066 mm |
q | Runout: max. 0.04 mm |
15 - | Sealing cap |
q | Renew |
q | Removing sealing cap with cylinder head cover installed: pierce on one side with an awl and pry out |
q | Installing → Anchor |
16 - | Inlet valve |
q | Do not machine, only grinding-in is permitted |
q | Valve dimensions → Fig. |
q | Checking valve guides → Chapter |
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Note
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Dimension | Inlet valve | Exhaust valve | |
Ø a | mm | 33.85 ± 0.10 | 28.0 ± 0.1 |
Ø b | mm | 5.98 ± 0.01 | 5.96 ± 0.01 |
c | mm | 104.0 ± 0.2 | 101.9 ± 0.2 |
α | ∠° | 45 | 45 |