I understand that we have Garrat turbos with variable vanes. I did a bit of searching around and found this explanation:

http://paultan.org/archives/2006/08/16/ ... etry-work/

Does this pretty much discribe how ours function? If so, what controls the vane position? Also, is there any chance that the vanes are sensitive to cruding up from the crankcase blowdown that is introduced to the inlet?

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2006 Libery Sport CRD, Lt Kakhi, nicely equipped
*****GDE Hot Tune at 38,879 miles
*****Stock TC.....for the time being!!

That would be Garrett. Here's another direct link to them on their tech section
http://www.turbobygarrett.com/turbobygarrett/tech_center/tech_center.html

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2005 Black CRD Limited w/105,000 miles
Mann Provent 200, Airbox Mod, ORM Mod
New 545RFE, TC & Redesigned pump @ 25,020 miles
New EGR Flow Control Valve @ 25,020 miles
New Transfer Case input/output seals @ 32,787 miles
SEGR Kit @ 52,000 miles
SunCoast TC and Transgo Shift Kit @ 52,000 miles

Vanes are vacuum controlled on our model (the ganglia of tubing & stuff just behind the air filter box).

Yes, in general VGT's are sensitive to cruding up (coking) from passing excess unburned residual motor oil mixed with soot (ie..keep the motor oil out of your CAC). When this happens, the vanes will "stick" and the turbo won't spool properly but I have yet to see anyone with a CRD report a failure from this problem. This style of turbo is also known to loose vanes if struck by a chunk of carbon (caused by a build-up of soot & unburned oil, then breaking loose and getting sucked into the vanes).

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2005 Liberty Sport CRD, Lt Khaki, sunroof

Thankful to now be an EX-CRD owner.