Crankcase; (Pcv) System - Mazda 323 1988 Workshop Manual

POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
4B
POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM
Cylinder head cover
+ Clean air
- Btowby gas
The PCV valve is operated by intake manifold vacuum
When the engine is running at idle, the PCV valve is slightly opened and small amount of blow-by
gas is drawn into the dvnamic chamber.
&t high engine speed, the PCV valve is further opened and large amount of blow-by
gas;
drawn into
the dynamic chamber.
PCV VALVE
inspection
1. Warm up the engine to the normal operating tem-
perature and run it at idle speed.
2. Disconnect the PCV valve together with the venti-
lation hose from the cylinder head cover.
3. Close the PCV valve opening with finger.
Make sure air is sucked into the PCV valve, if not
replace the valve.
48-71