Audi A3 Sportback, Сервисная инструкция, Страница: 24 / 60

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Crankshaft
The crankshaft has been modified to meet the
tougher demands of the turbo FSI engine, resulting
in higher component strength and enhanced
acoustics.
The flanges on the main bearings and the conrod
journal have been enlarged for greater rigidity. This
way, the rigidity specifications have been met
despite the 6.4 mm increase in stroke length.
Engine mass balancer unit
The balancer shaft gear has been adopted from the
naturally aspirated engine with respect to its
operating principle and position. However, the
following modifications were necessary:
●
separation of the gearing and imbalance masses
to improve balancing
● oil pump with wider gear
●
clean oil controlled pressure regulator with
pressure control on the raw oil side close to the
oil pump,
integrated in the balancer shaft housing
●
strength optimised die-cast housing
●
the balancer shafts are mounted directly in the
aluminium housing
● decoupled final drive sprocket in the balancer
shaft drive gear
Engine
Flanges
332_020
332_021
Crankshaft
Final drive sprocket
Drive gear
Imbalance gears
Balancer shaft
housing
Balancer shafts
Intake line
Oil pump