16
It is needed because the conrod bearings and main bearings have a
relatively small width. Incidentally, this material was also used for
the cylinder blocks of naturally-aspirated racing engines during the
1990s.
Material selection
The engine block is made from a high-tensile cast iron material,
previously used by Audi in its V6 and V8 TDI engines. This is the
first time that it is used in a petrol engine.
Note
The liquid sealants differ and, therefore, have different part numbers. Refer to ETKA and the Workshop Manual for specifi-
cations.
451_037
Oil pan
The oil pan is of two-part construction. The upper part acts as a
baffle plate and supports the oil pump. It is bolted together with
the crankcase. The oil pump is bolted to the cylinder block.
The lower part of the oil pan is made from sheet steel and accom-
modates the oil level/oil temperature sender G266 and the oil
drain screw.
The front sides are sealed by the timing case cover on the gearbox
side and by a sealing flange on the vibration damper side. Both
seal off the crankshaft by means of a shaft oil seal.
The oil pans and the front-side covers are sealed against the cylin-
der block by liquid sealant.
Oil pan upper part
Non-return valve of the oil
return line in the positive
crankcase ventilation system
Lower
timing case cover
Cylinder block
Oil level/oil temperature
sender G266
Front sealing flange
Oil pan lower part
Oil drain screw
