BMW S58, Owner'S Handbook Manual

Page: 48 / 102

S58�Engine
7.�Oil�Supply
42
Index Explanation
5 Intake�pipe�with�strainer
6 Spring�diaphragm
7 Sprocket
8 Oil�pump�sprocket
A�spring�diaphragm�(6)�is�installed�at�the�end�of�the�intake�pipe.�The�spring�diaphragm�dampens�any
acoustically�conspicuous�pressure�vibrations�caused�by�conveying�of�the�unfiltered�oil�in�the�intake
pipe.
7.3.1.�Maximum�delivery
In�its�basic�position,�the�oil�pump�is�held�in�the�maximum�delivery�position�by�the�pressure�control
spring�(1).�This�position�can�also�be�actively�approached�via�the�map�control�valve�from�the�minimum
delivery�position.�The�map�control�valve�is�switched�so�that�the�oil�can�flow�into�the�sump�via�the�map
control�valve.�This�position�of�the�data-map�control�valve�simultaneously�directs�the�oil�pressure�from
the�filtered�oil�duct�(2)�via�the�oil�duct�(12)�to�the�back�of�the�piston�pressure�side�(9)�of�the�axially
variable�pump�impeller�(3).�This�oil�pressure�on�the�piston�(9)�supports�the�pressure�control�spring�(1)
and�presses�the�axially�movable�impeller�(3)�into�the�maximum�delivery�position.