Positive Crankcase Ventilation (6.6L)

During normal operation, crankcase gases can be seen exiting from hose at oil separator. Maximum crankcase pressure is 16 in. H₂ O (4 kPa) at 3100 RPM measured at oil level indicator tube.

1. Oil Leak (External)
   
   Check the following:
   • Plugged or kinked crankcase ventilation system hoses.
   • Damaged or loose crankcase ventilation system hoses.
   • Valve rocker arm diaphragm covers loose.
   • Oil separator oil drain hose damaged or loose.
   • Too much crankcase pressure.
2. PVC Check Valve Stuck Closed
   
   Check The following:
   • Valve closes when 0.213 psi (1.47 kPa) of crankcase pressure is applied from crankcase side (bottom) of valve.
   • Valve should allow oil to drain from separator during idle and engine off conditions.
   • Inspect for proper operation by stopping engine and waiting 5 minutes to allow oil to drain back into crankcase. Remove drain hose from check valve. If more than residual oil (several drops) drains from separator, replace valve.
3. Odors
   
   Normal situation.
4. Noise
   
   Cracked hoses.
5. Smoke
   
   Internal engine failure.