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How does the engine breather works on a R51/3?

Posted: Wed 30. Sep 2009, 11:29
by Michael Steinmann
Dear all,
I will appreciate any explanation of how the oil engine breather works on a BMW R51/3 engine. The mechanism (a disk, a spring and a plate?) is mounted on the Aluminium timing gear. Thanks a lot in advance,
Michael Steinmann.