Positive Crankcase Ventilation: Testing and Inspection

Figure C13-1 - Oil/Air Separator (Typical):

RESULTS OF INCORRECT OPERATION
A plugged oil/air separator or hose may cause:
- Oil leaks due to high crankcase pressure.
- Sludge in engine due to inadequate scavenging of crankcase vapors.

A leaking oil/air separator or hose could cause:
- High idle speed due to vacuum leak.
- oil leaks from separator hose.

DIAGNOSIS
If oil sludging or leaks are noted, verify that the crankcase ventilation oil/air separator is not plugged. This may be done by verifying that smaller nipple (connected to hose item # 165) can be blown through or that 1.52 mm (0.60 in.
) plug gauge will fit into the orfice inside the nipple. If plugged, replace the crankcase ventilation oil/air separator assembly.

Chart C-13 Crankcase Ventilation Heater Functional Check is used to diagnose the crankcase ventilation heater assembly electrical system. Testing and Inspection