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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old June 9th, 2019, 15:42   #16
beckster
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So interestingly enough, we got the turbo out this afternoon and the impellers seem to be in ok condition and don't have any play. Considering the turbo has about 200k on it, it's probably not a bad idea to rebuild it at this point. Is there something else we could be missing that would cause oil to come out the tailpipe and go into the intercooler? Maybe just the seals blew out? Thoughts?
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Old June 9th, 2019, 16:02   #17
Yourbuddysatin
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Probably bad seal
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Old June 9th, 2019, 16:52   #18
IndigoBlueWagon
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No seals in a VNT-17. The impeller floats on a cushion of oil, and equal pressure on both sides of the center of the shaft keep the oil flowing through the turbo. When the turbo loses pressure on one side it'll push oil to the low pressure side. In this case it sounds like that's the turbine (hot) side, which is why oil came out the tailpipe. If the shaft isn't broken you may have galling of the shaft from oil contamination.
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Old June 9th, 2019, 18:26   #19
Yourbuddysatin
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Ahhh that’s good to know indigo!
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Old June 12th, 2019, 11:38   #20
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Quote:
Originally Posted by KERMA View Post
Gratz on 200k miles of service out of a "lowly" VNT17. Now build it better stronger faster than before. 17 plus
please contact info@kermatdi.com or 877-537-6283 and mention your personal details and this thread.
I second this, the S7 turbo they sell is excellent too. Previously, I ran a vnt17 and am now running an S7 and I couldn't be happier.
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Old June 21st, 2019, 15:21   #21
jeff@tdiecutuning
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if you are looking for another turbo check out xman turbo im not sure if he is a vendor on here or not tho
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Old June 21st, 2019, 21:42   #22
Typrus
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There's pretty clearly oil on both sides.

I've yet to see a turbo without seals. Most use a simple steel ring seal as a rubber seal wouldn't live at the temperatures and speeds they would be exposed to. Some use 2 ring seals, staggered as you would see on a piston.

I must ask, is your crankcase vent flowing properly and oil return unrestricted? You may have had a failure in the turbo that caused simultaneous seal failure but it is unlikely if the shaft is intact, spins freely, and has acceptable play.
High crankcase pressure and poor oil return can cause simultaneous seal failure, it would be wise to rule out both possibilities if you can.
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Old June 22nd, 2019, 18:40   #23
Mongler98
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Lack of shaft play does not mean that the turbo is still good. 99.9% of the failure with oil like this is from the journal bearing not holding the oil back, some makes it past but most of it like 98.9% of the oil goes to the return. When the journal bearing gets too hot from excess EGT's , heat soaking oil cooking after shut off, the return gets more resistance and the bearing is worn a bit causing excess oil pressure and it seeks the path of least resistance and that sir is your IC pipes. Now when the journal bearings decides to let go for whatever reason, oil will go EVERYWHERE, not just out of the exhaust it will go out the intake and out of the output of the turbo. There are moments of back pressure where oil vapor will make it to the air filter and MAF from the CCV on worn down older TDI's Not sure why but every TDI i have ever worked on or seen all have the same thing, oil mist on the air filter and on the MAF,
SO having oil on the input of the turbo means nothing good but not necessarily bad.

Point is, 200K is NOTHING in TDI miles and your turbo might still be ok.
Oil can comes from CCV, and i mean LOTS of oil if you have excessive blow by and higher than usual RPMS.
Rebuilding the VTN is cheap and i would have that done IIWY
Leakdown test, cold and HOT same with compression test is in your future once it runs again.
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