Crankcase Ventilation System Inspection/Diagnosis. GMC Truck GMC C Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Mechanical - 6.6L 🢒 Crankcase Ventilation System Inspection/Diagnosis

Concern

Action

DEFINITION: During normal operation the crankcase gases can be seen exiting from the hose at the oil separator.

The maximum crankcase pressure is 4 kPa or 16 in of water at 3,100 RPM measured at the oil level indicator tube.

Oil leak - external

•	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

Odors

Normal situation

Noise

Cracked hoses

Smoke

Internal engine failure