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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old April 13th, 2005, 19:11   #1
Veteran Member
troutguy's Avatar
Join Date: Aug 2003
Location: Epping, NH
Default Turbo meets FOD! and odd back bolt?

Ok so this is the current state of my turbo.
Picture is down two threads

If you notice, some of the impellors are in rough shape. While others are ok.

This next picture is the back of the turbo. What I don't understand is if you notice the center bolt (or whatever it is), it has a wierd shape. Does anyone know if this is normal? The bolt should have six equal sides, but this one does not.... What is going on? One side looks longer. Here is the picture..

Again the picture is down two threads.?.?

and this one...

Same deal?.?.?

Any ideas? Also, does anyone think that the impellor could be swapped out by a turbo rebuilder, or could a turbo rebuilder smooth out the impellor blades? I know that could be a stupid question, but I have heard that this is possible.

Thanks, Pete
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Old April 13th, 2005, 19:41   #2
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Default Turbo meets FOD! and odd back bolt?

The compressor wheel is removable and replacable, if parts are available. The bearing and possibly the turbine wheel/shaft would also need replacement. The damaged compressor often creates an imbalance that wipes out the bearing...

The "bolt" you are refering to is actually an integral part of the turbine wheel/shaft. It has been ground down on one side for balancing purposes. It can still be held with a standard 6 point socket while the compressor nut is loosened.
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Old April 13th, 2005, 19:52   #3
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Join Date: Sep 2003
Location: Springfield VA
Default Turbo meets FOD! and odd back bolt?

I don't know why your pics didn't work. You have the coding right Maby the extra character return at the end?

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Old April 13th, 2005, 23:01   #4
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Join Date: Oct 2003
Location: Gresham, Oregon
Default Re: Turbo meets FOD! and odd back bolt?

Call Shane--I have info from the last time I talked to him listed on my sources page.
Good luck--but with a VNT I think you are looking at a new turbo...
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