Mechanical system
17
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
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Valve assembly
Valve assembly with hydraulic valve clearance compensation
The valve assembly was modified with the aim of opti-
mizing friction and reducing the moved masses.
The camshafts control two intake valves and two
exhaust
valves per cylinder. This valve timing system
uses low-friction roller-type cam followers with
hydraulic valve clearance compensation.
Valve assembly
1 Slide rail
2 Timing chain
3 Camshaft drive gears
4Intake camshaft
5Exhaust camshaft
6 Sensor wheel with orifice plate
7 Roller-type cam followers
8 Hydraulic valve clearance compensator
9 Chain tensioner
10 Timing chain drive gear
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