17
is a pressure relief valve. It is located inside the
oil pump housing and opens when the oil
pressure rises too high (cold start). If an
excessively high oil pressure builds up,
various component parts of the oil circuit (e.g.
oil filter, oil cooler) may be damaged. Also,
there is the possibility of the inlet and exhaust
valves opening or no longer closing, due to
“bulking“ of the hydraulic tappets. The knock-
on effect of this is that the engine can no
longer be started or cuts out.
The oil pressure limiting valve ......
regulates the engine oil pressure. It is
integrated in the oil pump housing. The oil
quantity “regulated“ by the oil pressure
control valve is fed to the suction side of the
oil pump.
This helps to optimise efficiency.
The oil pressure control valve ......
prevent the oil running out of the oil filter and
the cylinder heads and back into the oil sump
while the engine is stationary.
The oil retention valves ......
The “integrated oil supply“ ...
will also be adopted for all V6 5V naturally
aspirated engines.
Each camshaft bearing is supplied via a
drilling stemming from the cylinder head main
gallery.
The oil is fed along a bolt shaft in the bearing
cap to a transverse drilling.
A lubrication groove distributes the oil
throughout the camshaft bearing. It is no
longer necessary to run a pipe to the
individual bearing caps.
Advantages:
•
Fewer components
•
Quick and even oil supply
•
No additional installation work necessary
•
Lower cost
SSP 198/58
Cylinder head main gallery
Transverse drilling
prevent “flooding“ of the cylinder heads. At
high engine speeds, an excessively large
amount of oil enters the cylinder heads and
has to be returned to the oil sump via the oil
return drillings. The restrictors reduce the oil
flow and thereby ensure that return flow takes
place.
The restrictors ......
Summary of Contents for 2.7-litre V6 Biturbo
Page 47: ...48 Notes ...
Page 71: ...72 Notes ...
