Normal engine operation
P0006028
1
/: The control valve reduces oil pressure; the pres-
sure is around 1 bar in the rocker arm shaft. The check
valve (
7
) is held open by the piston (
8
) being moved
forward by the spring (
9
). The oil channels are filled
with oil but the low pressure is not sufficient to raise
the pump piston (
5
) to its upper position.
The EGR rocker arm (
10
) has no contact with the
exhaust rocker arm (
4
). In this situation the exhaust
valves are not affected by the EGR cam lobe.
EGR activation
P0006029
2
/: The control valve raises the oil pressure to system
pressure; the pressure is above 2 bars in the rocker
arm shaft. The piston (
8
) is moved backwards but the
check valve (
7
) is held open by the oil flow. The high
pressure is sufficient to lift the pump piston to its upper
position.
When the pump piston (
5
) is forced to the upper posi-
tion, the clearance between the EGR rocker arm (
10
)
and the exhaust rocker arm (
4
) is reduced.
20-0 Engine Information, General
7748841 06-2010
73
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