40
N55 Engine
Intake and Exhaust Valves
The valve stems have a diameter of 5 mm on the intake valve and 6 mm on the exhaust
valve. The larger diameter exhaust valve are hollow and filled with sodium. In addition, the
valve seat of the exhaust valves are reinforced.
Valve Springs
The valve springs are different for the intake side and exhaust side.
Index Explanation
1
VANOS unit, intake camshaft
2
VANOS unit, exhaust camshaft
3
Injector well
4
Spark plug well
5
Camshaft housing
6
Valvetronic servomotor
7
Inlet camshaft
8
To r s i o n spring
9
Gate
10
Eccentric shaft
11
Intermediate lever
12
Roller lever tappet
13
Valve head
14
Oil spray nozzle
15
Passages for introducing blow-by gas into the intake ports
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