Oil Contaminant Separator (OCS)
The oil contaminant separator (OCS) vents gasoline fumes, water vapor and other contaminants from the engine's crankcase. The shaft of the engine's counter balancer is hollow, and contaminated fumes exit the crankcase through holes in the counter balancer weight. These holes are shown inside the red oval in the photograph below.
The counter balancer vents the fumes to a port on the stator cover. A hose on the front of the stator cover conducts the fumes to the oil contaminant separator (OCS), the black capsule shown inside the yellow circle in the photograph above.
Please note, the OCS was installed
incorrectly, in an
inverted position as shown in the photograph above.
The hose should connect to the
top of the OCS, and the mounting clip should be located at the
bottom of the OCS, as shown in the photograph below. If your OCS is inverted, remove it, and install it as shown in the photograph below. Otherwise you will collect excess fuel in the clear tube beneath the OCS.
It is normal, and
good, for the OCS to collect condensed fuel vapors which have evaporated from the crankcase. When the tube fills with condensed water and fuel vapors, remove the plug at the bottom of the tube to drain the contaminants for a safe, environmental disposal.