Repair manual

Oil Circulation System
17
Self-Regulating Oil Pump
A newly developed self-regulating engine oil pump is
used on the 2.0L TFSI CAEB engine. The main purpose
of this development is to increase pump operating
efficiency and in turn, reduce fuel consumption.
When compared to other self-regulating oil pumps, this
design has a more efficient control concept.
Design
With an external gear pump, the driven pump gear is
axially displaceable in relation to the drive gear. This
means that the driven gear can move and change the
amount the gear lobes mesh with those of the drive gear
under certain operating conditions.
By displacing the driven pump gear, the delivery rate and
pressure in the oil circulation system can be regulated in
a controlled manner.
Oil Pressure
Regulation
Valve N428
Pumped Oil
Drive
Pump
Gear
Intake from
the Oil Pan
Driven Pump
Gear (axially
displaceable)
Cover
Driven Pump
Gear (axially
displaceable)
Regulating
Spring
Pump
Housing
Control
Piston
Cold
Start
Valve
Check
Valve
Cam
Lobe
Unit
Final Drive
Sprocket
Input Shaft with
Drive Pump Gear
Compression
Spring of the
Cam Lobe Unit
Overview of the Components