Yaroslavl Engine Plant YMZ-536 Operation Manual page 106

Through the 2mm hole 13 in the cover 12 atmospheric
pressure is applied onto the diaphragm. From below, on the crankcase
gases side the diaphragm 14 is spring-loaded by the cylindrical spring
15.
The crankcase gases are removed via the circular slot between
the diaphragm and the central outlet pipe 16.
When the turbocharger sucks from the engine an excessive
amount of crankcase gases, underpressure is created inside the engine
and the diaphragm 14 under the action of atmospheric pressure sits
down onto the central outlet pipe 16 thus closing it.
ATTENTION! THE CRANKCASE VENTILATION SYSTEM DOES
NOT REQUIRE MAINTENANCE AND
DISASSEMBLED.
ENGINE, FILL THE 1
3
WITH 2 – 3 cm
106
BEFORE STARTING THE NEW OR REPAIRED
ST
STAGE HYDRAULIC LOCK 4 (VIEW B)
OF THE ENGINE OIL USED IN THE ENGINE.
IS NOT MEANT TO BE