CRANKCASE VENTILATION SYSTEM
The engines equipped with the open crankcase ventilation have two breather caps, located on the rocker cover.
The caps should be cleaned in a petroleum solvent at every oil change.
Closed System (P.C.V.)
The closed system is known as the positive crankcase ventilation system. Clean air is supplied from the air
cleaner by a tube to the closed oil filler cap on the rocker cover. The fumes are vented out through a regulator valve at the
rear of the rocker cover and into the intake manifold. The P.C.V. valve (regulator valve) must be replaced at 400 hours.
The hoses, tubes and fittings of this system must be cleaned at 800 hours.
The disposable filter is located on the fuel pump body. Unscrew the filter housing from the body and remove the
filter element and gasket. Discard the element and gasket. Clean the filter housing in a petroleum cleaning solvent.