Engine - Oil Filler Cap Leaks/Blue Exhaust Smoke

17 07 07

August 7, 2007

2015505/1





Models

Oil leaks; excessive oil in air intake hoses

Condition

One or more of the following conditions may be present:

^ Oil leaks from oil filler cap.

^ Occasionally, light blue smoke is visible in the exhaust.

^ Excessive amount of engine oil can be found in the air intake hoses after the turbocharger.

^ Increased engine oil consumption.

Technical Background





The described conditions may be caused by a malfunction of the crankcase ventilation system pressure regulating valve (Figure 1).





The guide pin of the check valve in the intake manifold side of the valve (Figure 2) may break, preventing the check valve from correctly sealing when boost pressure is present in the intake manifold. Intake boost pressure will thus be applied to the engine crankcase, resulting in oil leaks and preventing engine oil from properly draining from the turbocharger through the oil return line.

Production Solution

Improved crankcase ventilation system pressure regulating valve.

Service

1. Inspect the crankcase ventilation system pressure regulating valve.

2. If the check valve is stuck open or its guide pin is broken, replace the crankcase ventilation system pressure regulating valve.





Warranty





Required Parts and Tools

Tip: Always check ETKA using the VIN to ascertain which valve is applicable for the vehicle. The two listed valves are not interchangeable. Installation of the wrong valve will result in MIL on and rough idle condition.

All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.