Service Manual

Crankcase Emission Control System
Blowby gas (high load region)
Blowby gas and fresh air (low load region)
Induction chamber
Breather hose
Positive crankcase ventilation (PCV)
valve
hose
Ventilation
Figure 52
System Inspection
1. Remove ventilation hose from rocker cover where
positive crankcase ventilation (PCV) valve is attached.
2. Run engine at idle and put a finger on open end of
ventilation
hose to check for intake manifold vacuum.
3. If vacuum is not felt on finger, clean or replace PCV
valve.
Figure 53
Inspection of PCV Valve
1. Remove PCV valve.
2. Insert a thin object into PCV valve from the black nip-
ple side to check that the plunger moves.
3. If plunger does not move, the PCV valve is plugged.
Clean or replace PCV valve.
Figure 54
Positive crankcase
ventilaton (PCV) valve
Liquid Cooled Gas Engine
Page 3 – 36
Workman 3000/4000 Series