Engine Lubrication; The Oil Circuit - Audi V6 BITURBO Manual

Engine

Engine lubrication

The oil circuit of the 2.7-litre V6 biturbo engine largely corresponds to that
of the 3rd V6 engine generation.
In addition, the two exhaust gas turbochargers are supplied with
pressurised oil from the main oil gallery via a distributor piece. The oil is
returned directly to the oil sump.
The oil cooler was adapted to withstand the higher thermal stresses in
comparison with a naturally aspirated engine.
to oil filter/oil cooler
Oil pressure relief valve
from oil filter/oil cooler
Spring-loaded slipper
(chain tensioner)
Oil pressure
control valve
Induction filter
Oil pressure relief valve
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Restrictor
Oil retention
valve
Main oil gallery
Oil temperature
sender
from oil filter/oil cooler
to oil filter/oil cooler
A new feature of the biturbo is
the "integrated oil supply" (see
next page).
Exhaust gas turbocharger
distributor piece
SSP 198/49
Oil pressure switch
Bypass valve

The oil circuit

Bearing cap
A duocentric oil pump draws in the oil
Oil groove
through a coarse filter. Located in the
pressure chamber of the pump is a
pressure relief valve which protects
downstream components against
pressure peaks during cold starts.
The oil is fed to the oil filter via the oil
cooler. After passing an oil retention
valve, the oil flows through the filter
element. A bypass filter is connected in
parallel with the filter element.
The oil subsequently reaches the main
oil gallery. A branch line is routed to the
oil pressure control valve (clean oil
side).
The following components are supplied
with oil from the main oil gallery:
- the four crankshaft bearings
- the two exhaust gas turbochargers
- the three pairs of piston spray jets via
Oil retention valves
- the cylinder head of cylinder bank 1
Filter element
The cylinder head of cylinder bank 2 is
supplied through a separate bore from
crankshaft bearing 2 via an oil retention
valve also.
First of all, the camshaft adjustment
valve is supplied with oil from the inlet
drilling in the cylinder head. After the oil
has passed by a restrictor, it is
channeled via the cylinder head main
gallery to the hydraulic valve tappets
and the camshaft bearings.
Bypass filter
via an oil distributor line
a spray jet valve
via an oil retention valve
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