PCV valve question
3rd Gear
Joined: Sep 2006
Posts: 2,738
From: Holland MI
Stock 2002 2.7T with 155K KMs
In recent cold weather the PCV System froze up. Internal crank case pressure went too high causing failure of at least one cam shaft seal. On this particular engine, front crank seal also observed leaking along with both valve cover gaskets and both cam adjuster gaskets. All these seals had been replaced at least once already suggesting PCV problems were brewing for awhile. This engine had the original PCV System and original Oil Cap.
Suggestion for those maintaining a higher mileage 2.7T and esp in colder climates, recommend to replace with updated PCV Spider Hose assembly and updated Oil Cap with internal pressure vent. The cost of maintaining effective 2.7T crankcase ventilation is much less than repeated premature oil seal failures.
If your Audi Engine has a Suction Pump, recommend to replace it along with PCV System. IIRC some early 2.7T engines had a Suction Pump, as well as many 1.8T's and 2.8's among other engines.
YMMV
Here's another picture from another site....maybe it will help. This might be the 4.2 engine.
In recent cold weather the PCV System froze up. Internal crank case pressure went too high causing failure of at least one cam shaft seal. On this particular engine, front crank seal also observed leaking along with both valve cover gaskets and both cam adjuster gaskets. All these seals had been replaced at least once already suggesting PCV problems were brewing for awhile. This engine had the original PCV System and original Oil Cap.
Suggestion for those maintaining a higher mileage 2.7T and esp in colder climates, recommend to replace with updated PCV Spider Hose assembly and updated Oil Cap with internal pressure vent. The cost of maintaining effective 2.7T crankcase ventilation is much less than repeated premature oil seal failures.
If your Audi Engine has a Suction Pump, recommend to replace it along with PCV System. IIRC some early 2.7T engines had a Suction Pump, as well as many 1.8T's and 2.8's among other engines.
YMMV
Here's another picture from another site....maybe it will help. This might be the 4.2 engine.
Junior Member
Joined: Jan 2007
Posts: 3
From:
That's the 4.2 - and the part I need
So, I figured it was a PCV or CCV but couldn't find any references to the real name or part number for being able to find one. I have a 2000 A8 with the 4.2 and need to replace that part. Anyone know the part number?
3rd Gear
Joined: Dec 2008
Posts: 1,941
From: IL
1st Gear
Joined: Mar 2009
Posts: 30
PCV valve location
PCV valve is Attached to the F hose and one of the ends off the spider breather hose that runs under the left side of the intake manifold. You need to remove the passenger side Diverter Valve to get to it. Remove the F hose from the breather hose and there it is.
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