CAC Gasoline Engine Maintenance And Servicing Manual
61
【16】 Positive Crankcase Ventilation（PCV）system of engine.
1. Description for PCV system of the Carburetor engine:
PCV system is a closed system.
The leaking air of piston from the Crankcase goes to the
cylinder head cover through the PCV hose. The exhaust gas enters
the intake manifold passing the 3-way pipe after throttled by the
absolute pressure pipe connector. The gas in the crankcase enter
the 3 -way pipe through the guide cover to ventilate the crankcase.
The PCV system includes oil baffle assembly, PCV
pipe—cylinder block, absolute pressure transmission hose
connector, 3-way connector, valve chamber cover, connecting hose,
ventilation hose. See the above for Removal and Assembly of oil
baffle assembly and valve chamber cover assembly.
2. Description for PCV system of 480M engine
2.1 Description of
PCV system.
The PCV
system is a closed
system.
The leaking air
of piston goes to the
rear cylinder head
cover from the
Crankcase through
the PCV hose. PCV
valve is connected
to the intake
manifold. Meantime,
a Ф15 hose in the
front of the valve
chamber cover
assembly is
connected to the
guide cover and PCV valve by the 3-way connector
through a hose.
The PCV system includes oil baffle
assembly, PCV pipe——cylinder block,
PCV hose, PCV valve, 3-way connector,
valve chamber cover, connecting hose,
and ventilation hose.
hose
3 way connector
Absolute pressure transmitting hose connector
PCV valve
3 way connector
guide cover
cover
Clip
Fig. 107
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