94mx5red

iTrader: (14)

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.

fooger03

iTrader: (2)

compression/leakdown?

venting of crankcase not plugged up?

94mx5red

iTrader: (14)

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.

Joe Perez

iTrader: (8)

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.

curly

iTrader: (25)

If it were a new setup, I'd say something is wrong with it, but since you've been running this for 30k miles, I'd say it's the turbo.

What's the shaft play like?

94mx5red

iTrader: (14)

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.

supersuk

iTrader: (5)

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.

dustinb

My money is on a blown oil seal on the turbo.

Golferluke

Thats what I was thinking. Also if you've got almost a quart of oil in the pipes and the turbo will fill a can in less than a minute. Make sure you check your oil level before you go revving the motor for an hour.

chicksdigmiatas

iTrader: (11)

In for answer/turbo rebuild.

hustler

iTrader: (6)

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.

DammitBeavis

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.

Stephanie Turner

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

Braineack

iTrader: (62)

The only reason I wouldn't think this is the motor's condition was he stated the breather line does not enter the intake.

Stephanie Turner

But the oil supply line and oil drain line are still attached. Pressure and flow are still a factor. Need to know if it makes boost.
Stephanie

Sean

iTrader: (12)

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.

Braineack

iTrader: (62)

ah true, if there was compression leaking past oil rings, there would be slight odd pressure differentials happening in the oil drain.

Joe Perez

iTrader: (8)

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.

94mx5red

iTrader: (14)

Turbo still makes boost. Did not really feel down on power either.

PCV valve (323 version) is one year old.

I appreciate the reponses.

94mx5red

iTrader: (14)

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!!!!