51
N55 Engine
The Valvetronic III servomotor contains a sensor for determining the position of the motor
and the eccentric shaft. The servomotor is lubricated with engine oil by means of an oil
spray nozzle (1) aimed directly at the worm drive and the eccentric shaft mechanism.
N55, design of valve lift adjustment
Index Explanation Index Explanation
1
Oil spray nozzle
10
Intake valve
2
Eccentric shaft
11
Valvetronic servomotor
3
Return spring
12
Exhaust valve
4
Gate block
13
Valve spring
5
Inlet camshaft
14
Hydraulic valve lash adjustment
6
Intermediate lever
15
Roller cam follower, exhaust
7
Roller cam follower, intake
16
Exhaust camshaft
8
Hydraulic valve lash adjustment
17
Sealing sleeve
9
Valve spring
18
Socket
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