P0006030
3
/: The oil pressure lifts the pump piston (
5
) to the
upper position and occupies the space beneath the
piston. When oil has completely filled the system and
oil flow ceases, the check valve (
7
) closes. When the
EGR rocker arm (
10
) then rolls over the lobe,
the pump piston is forced down and the oil beneath
the piston is forced on to the power piston (
6
). The
piston is pushed down and the exhaust valves open.
The check valve (
7
) is held closed by the high oil
pressure during the time the exhaust valves are open.
P0006031
4
/: After the exhaust valves have closed and the EGR
rocker arm no longer depresses the pump piston, the
oil that forced the power piston (
6
) down flows back
to the pump piston (
5
).
The system is replenished by the check valve (
7
)
opening and allowing a quantity of oil to pass corre-
sponding to the quantity leaked off during the previous
cycle.
20-0 Engine Information, General
74
7748841 06-2010
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