Positive Crankcase Ventilation: Testing and Inspection

CV Tube:

CV Hose:

CV Tube:

INCORRECT OPERATION MAY CAUSE
1. A plugged oil/air separator or hose may cause:
a. Oil leaks due to high crankcase pressure.
b. Sludge in the engine due to inadequate scavenging of crankcase vapors.

2. A leaking oil/air separator or hose could cause:
a. High idle speed due to a vacuum leak.
b. Oil leaks from the separator or hose.

DIAGNOSIS

Crankcase Ventilation Oil/Air Separator
If oil sludging or leaks are noted, verify that the CV oil/air separator is not plugged. This may be done by verifying that the smaller nipple can have air blown through or check that a 1.52mm or .060" plug gauge will fit into the orifice inside the nipple. If plugged, replace the CV oil/air separator assembly.