Crankcase Emission Control System - Toro Workman 3000 Series Service Manual

Crankcase Emission Control System

Induction chamber
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.
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.
Liquid Cooled Gas Engine
Breather hose
Blowby gas (high load region)
Blowby gas and fresh air (low load region)
Figure 52
Page 3 – 36
Positive crankcase ventilation (PCV)
valve
Figure 53
Positive crankcase
ventilaton (PCV) valve
Figure 54
Workman 3000/4000 Series
Ventilation
hose