Turbo ruined?
#1
Senior Member
Thread Starter
iTrader: (14)
Join Date: Oct 2006
Location: South East Florida
Posts: 677
Total Cats: 6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
![Name: 100_3184.jpg
Views: 262
Size: 121.8 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190486d1501222729-turbo-ruined-100_3184.jpg)
![Name: 100_3182.jpg
Views: 252
Size: 127.2 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190487d1501222729-turbo-ruined-100_3182.jpg)
![Name: 100_3202.jpg
Views: 250
Size: 55.7 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190488d1501222729-turbo-ruined-100_3202.jpg)
Here are the facts:
- Everything has been fine with my treating the car softly for a long while
- Replaced completely shot stock motor mounts with competition mounts
- Started smoking like crazy
- Turbo drain would fill a 12oz beer can in about a minute, maybe less
- No restrictor that I know of in oil feed (possible BEGI put one in)
- Have been running this setup for about 30k miles
- Idled/reved the car for about an hour and it continued to smoke without any piping connected to manifold
- At least a half a quart of oil was inside of the piping / intercooler
Where do I go next?
- Put in an oil retrictor and try again?
- Use the CHRA exchange and spend probably close to $500 (have not called them yet)?
- Get a different turbo (2560 sized) for better top end/cheap out and go chinese?
Thought / Guesses:
- Whatever oil was in intake manifold would have had to have burned out in an hour, seal in turbo is blown and allowing oil to enter exhaust directly
- Oil return line was shortened close to 2 inches, and I think it was draining fine beforehand
Thank you for the opinions gentleman.
#3
Senior Member
Thread Starter
iTrader: (14)
Join Date: Oct 2006
Location: South East Florida
Posts: 677
Total Cats: 6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Did not do either yet.
Head is pretty new, replaced last year from a '95. Cleaned and inspected.
Bottom end is old, maybe 170k.
Edit:
Driver's side crankcase vent is to atmosphere/beer can. Passenger side goes to intake manifold and has the 323 PCV valve.
Head is pretty new, replaced last year from a '95. Cleaned and inspected.
Bottom end is old, maybe 170k.
Edit:
Driver's side crankcase vent is to atmosphere/beer can. Passenger side goes to intake manifold and has the 323 PCV valve.
#4
Boost Pope
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/smod.png)
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
Total Cats: 6,793
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Questions:
1: Is that a ball-bearing or journal-bearing turbo?
2: I can't play jewtube videos at work (so maybe this is answered) but how does it sound?
3: Any abnormal shaft play? (Shaft play. There's no way to write that without it sounding like gay ****. Sorry.)
Could be that the shaft seal finally just decided to call it a day. 30,000 miles ain't all that bad.
1: Is that a ball-bearing or journal-bearing turbo?
2: I can't play jewtube videos at work (so maybe this is answered) but how does it sound?
3: Any abnormal shaft play? (Shaft play. There's no way to write that without it sounding like gay ****. Sorry.)
Could be that the shaft seal finally just decided to call it a day. 30,000 miles ain't all that bad.
#6
Senior Member
Thread Starter
iTrader: (14)
Join Date: Oct 2006
Location: South East Florida
Posts: 677
Total Cats: 6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Garrett ball bearing 2554r.
My experience with shaft play is minimal. Meaning I touched this one and one other. It feels about the same as the last time I touched it, maybe 3 years ago. Spins freely, and sounds completely normal.
Turbo was purchased used. Previous owner said he ran it (I forget) maybe 5-15k miles at 15psi. I have kept it at wastegate level of maybe 7psi.
What kills me is the sheer coincidence of the replacement of the motor mounts. Simply jacked up the engine and replaced. Nothing else was touched.
My experience with shaft play is minimal. Meaning I touched this one and one other. It feels about the same as the last time I touched it, maybe 3 years ago. Spins freely, and sounds completely normal.
Turbo was purchased used. Previous owner said he ran it (I forget) maybe 5-15k miles at 15psi. I have kept it at wastegate level of maybe 7psi.
What kills me is the sheer coincidence of the replacement of the motor mounts. Simply jacked up the engine and replaced. Nothing else was touched.
#7
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Maybe the oil drain got kinked in the process of changing the motor mounts, caused a back up of oil that blew a seal? Whatever the case is, looks like you blew the oil seal thats located behind the compressor. Its a small compression C-clip type that sits in a groove on the shaft. Maybe you can just replace that part since the shaft play isn't too bad....I've never worked on a ball bearing turbo before.
#11
Tour de Franzia
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I had similar problems on an old journal bearing turbo on my VW. A restricter on the oil feed fixed it after a few days of street driving. Do what everyone else did and go ahead and get a .032" oil feed fitting.
#12
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've mentioned this in other threads, but I once overfilled my oil (accidentally) enough to cover the return fitting in the oilpan, and mine did the same thing (GT2560R). The problem disappeared when I took the oil down to the proper level. I started wondering if this sort of thing would happen in a long continuous right turn, and put in a restrictor anyway.
#13
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
The thing about these turbos is that the seals are bad from the factory, or they are good. There really is no in between. If the turbo still makes boost, chances are the turbo is just fine and you need to look elsewhere for the problem.
That said, seals can "temporarily not work". Something is causing excessive oil flow or pressure for there to be that much oil. When there is excessive flow and pressure, the oil seals will leak. It is sort of a built in fail safe for the turbo. Get rid of the excessive flow or pressure, and the seals will return to normal operation. If this is a sudden problem, I would check the oil drain line. Make sure it is not kinked or blocked internally. After that, make sure an oil catch can has a vent hole. Make sure your PCV valve is working. Then I would install an oil restrictor. If none of that fixes your problems, I would start on the engine next. A Leak down test would be in order.
Stephanie
That said, seals can "temporarily not work". Something is causing excessive oil flow or pressure for there to be that much oil. When there is excessive flow and pressure, the oil seals will leak. It is sort of a built in fail safe for the turbo. Get rid of the excessive flow or pressure, and the seals will return to normal operation. If this is a sudden problem, I would check the oil drain line. Make sure it is not kinked or blocked internally. After that, make sure an oil catch can has a vent hole. Make sure your PCV valve is working. Then I would install an oil restrictor. If none of that fixes your problems, I would start on the engine next. A Leak down test would be in order.
Stephanie
#16
Elite Member
iTrader: (12)
Join Date: Nov 2009
Location: Harpers Ferry WV
Posts: 1,516
Total Cats: 20
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
My vote would be blown oil seal. Like others have said maybe when you did the mounts the drain got kinked and the internal lining is still closed inside the line. Put a restrictor in it and see if it helps and if you did kill the turbo 30K is not bad at all. I would be happy to get 30K out of a turbo.
#18
Boost Pope
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/smod.png)
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,339
Total Cats: 6,793
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I have a hard time imagining that unless the vent tube at the side of the cam cover is completely blocked off (or connected to the pressurized side of the intake) he'd be generating more than a few tenths of a PSI inside the crankcase relative to atmo, regardless of what the rings look like.
#20
Senior Member
Thread Starter
iTrader: (14)
Join Date: Oct 2006
Location: South East Florida
Posts: 677
Total Cats: 6
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
![Name: 100_3280.jpg
Views: 248
Size: 67.4 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190261d1501222289-turbo-ruined-100_3280.jpg)
![Name: 100_3282.jpg
Views: 239
Size: 58.9 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190262d1501222289-turbo-ruined-100_3282.jpg)
![Name: 100_3277.jpg
Views: 240
Size: 100.7 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190263d1501222289-turbo-ruined-100_3277.jpg)
![Name: 100_3275.jpg
Views: 258
Size: 128.9 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190264d1501222289-turbo-ruined-100_3275.jpg)
![Name: 100_3287.jpg
Views: 252
Size: 74.5 KB](https://www.miataturbo.net/attachments/diy-turbo-discussion-14/190265d1501222289-turbo-ruined-100_3287.jpg)
No more blowing *****!
Installed THIS .030" restrictor from BEGI.
Started the car. A little bit of oil came out of the compressor side, then completely stopped after about 5 minutes. It seemed like there was less smoke from the exhaust, but there was still quite a bit.
Took the car out for a spin. After two boosted runs, the smoke disappeared!!!!