Results Of Incorrect Operation
• | A plugged valve or hose may cause the following conditions: |
- | Stalling or slow idle speed |
• | A leaking crankcase ventilation valve or hose may cause the following
conditions: |
Functional Check
With these systems, any blow-by in excess of the system capacity, from
a badly worn engine, sustained heavy load, etc., is exhausted
into the air cleaner and is drawn into the engine.
Proper operation of the crankcase ventilation system depends upon a
sealed engine. If oil slugging or dilution is noted and the crankcase ventilation
system is functioning properly, check the engine for a possible cause. Correct
any problems.
If an engine is idling rough, check for a clogged crankcase ventilation
valve, a dirty vent filter, air cleaner element, or plugged hose. Replace
as required. Use the following procedure:
- Remove the crankcase ventilation valve from the rocker arm cover.
- Operate the engine at idle.
- Place your thumb over the end of the valve in order to check for
a vacuum. If there is no vacuum at the valve, check for the following items:
• | The crankcase ventilation valve |
- Turn OFF the engine. Remove the crankcase ventilation valve. Shake
the valve. Listen for the rattle of the check needle inside of the valve.
If valve does not rattle, replace the valve.