At Idle and Mid-Part Load

The blowby gases flow at idle speed and at lower part load out of the front of the crankcase (1) along the left intake duct (3) into the oil separation chamber (11a) in the left cylinder head cover (11).

The blowby gases than flow along the connection line (4) with the 1.5 mm diameter restriction orifice (8) to the combustion chambers.

At the same time, fresh air flows into the crankcase (1) through the vent pipe (5), right cylinder head cover (12), oil separation chamber (12a) and intake shaft (2).

When performing repairs, check the flow through the vent pipes 4 and 5 and also the restrictor trimming (8).