Hombre XS Space Cab L4-2.2L CPC (1997)
Positive Crankcase Ventilation: Description and Operation
General Description
A crankcase ventilation system is used to provide scavenging of the crankcase vapors. Blow-by gases are passed through a crankcase ventilation
oil/air separator into the air cleaner outlet resonator. The oil/air separator is inside the valve rocker arm cover and allows any scavenged oil to be
returned to the crankcase.
Operation
The only flow through the oil/air separator is the combustion blow-by, as there is no fresh air inlet to the crankcase. The primary flow of blow-by
into the separator is through the openings inside the valve rocker arm cover. The oil/air separator causes oil, which may be suspended in the
blow-by gases, to be separated and drain back to the crankcase. The blow-by gases are then drawn into the air cleaner outlet resonator by normal
engine vacuum and burned in the combustion process.
