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") plug gauge will fit into the orfice inside the nipple. If plugged, replace the crankcase ventilation oil/air separator assembly.