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Old 03-04-2008, 11:08 PM   #1
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Default My Turbo Is Bleeding!

what would cause my brand new t25 with less than 1k miles on it to have oil coming out of the out side of the compressor?
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Old 03-04-2008, 11:14 PM   #2
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an impoper drain? also don't some garrets need restrictors?
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Old 03-04-2008, 11:28 PM   #3
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i dont think its the drain. but i dont know about the restrictor thing, its a T25, does anyone know for sure if it needs a restrictor?
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Old 03-04-2008, 11:31 PM   #4
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over oiled or a bad dynamic seal.
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Old 03-04-2008, 11:41 PM   #5
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its dieing :(
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Old 03-04-2008, 11:43 PM   #6
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if you do need a rebuild I got a place in NC that can do it for a good price and even upgrade the shaft or trim if you want. they can do custom work on your turbo and provide 1yr warranty if their work fails.
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Old 03-04-2008, 11:49 PM   #7
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[shamelessplug] you should buy my 13g [/shamelessplug]
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Old 03-04-2008, 11:57 PM   #8
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Pics of your engine bay please.

A leaking compressor is due to one of 2 things:
Oil getting pulled in via your valve-cover-breather-tube. Routed?
Or oil backing up in the CHRA and making it past the dynamic seal.
Both are due to crankcase pressurization (or perhaps overoiling, easily fixed for .05cents).

Check operation of PVC valve, and make sure your dipstick is seated tightly.

It has been my experience that if you are pressurizing the crankcase, you will always get oil into the turbine housing before the compressor housing.

You might be overoiling due to no restrictor, or due to slight crankcase pressurization. Here's the easiest restrictor possible. I'm going on 20k+miles on the same rivet. This will tell you all you need to know: https://www.miataturbo.net/forum/showthread.php?t=6116
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Old 03-05-2008, 12:11 AM   #9
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Well I guess i'm going to be installing a pop rivet into my turbo. There is no definitive yes or no about restrictors, but its probably safest to run one.
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Old 03-05-2008, 01:04 AM   #10
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as it concerns the restrictor, they guys that specialize in turbos where i got my rebuilt said that it is a big mistake to put a restrictor on a non ball bearing turbo. a.k.a wet float bearings. putting in a restrictor can actually cause damage to the bearings and shaft.
did you run synthetic oil from the first day you got your turbo on? if the answer is yes than your seals did not get a chance to fit properly since synthetic oil is so much thinner than conventional oil. a way to fix this is to run conventional oil on your car for about 300mils and let he seals seal.
if answer is no than you may want to check for pressurized crank case.
and
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Old 03-05-2008, 02:36 AM   #11
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i used regular oil and still am. im going to have to go with the valve cover breath tube (because the turbo is BRAND NEW). i just found out about the PCV valve issue on miatas today and will check it. fyi: the fix seems to be using a stock 323 gtx PCV valve, Part# E301-13-890A. what does it mean to pressurize the cranck case, how do you do it and why?
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Old 03-05-2008, 07:59 AM   #12
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If any boost at all makes it into the crankcase, then it will back oil up in the oil drain line (which drains into the crankcase) and into the CHRA. Since the oil is being force-fed via the oil inlet line, and it can't drain because of pressure in the crankcase, then you will blow oil past the seals of the CHRA into the compressor and turbine.

The most common causes of this are blown headgasket, bad PCV valve, improper use of valve-cover-breather tube.

The area under the valve cover and the crankcase are connected via long hole drilled completely throught the head and block so oil can circulate. If your PCV valve fails or leaks, it will pressurize the valve cover and the crankcase simultaneously, blowing oil into the intake through the breather line and backing up the oil drain.

People have blown the 323 GTX valves... the solution is to go to Mazda and order an OEM piece and not from an auto-parts store.
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Old 03-05-2008, 12:19 PM   #13
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You think this problem might be related to this one?

https://www.miataturbo.net/forum/showthread.php?t=17899
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Old 03-05-2008, 10:09 PM   #14
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geez, i wonder why its lacking power
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Old 03-05-2008, 10:53 PM   #15
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Quote:
Originally Posted by samnavy View Post

The most common causes of this are blown headgasket, bad PCV valve, improper use of valve-cover-breather tube.

People have blown the 323 GTX valves... the solution is to go to Mazda and order an OEM piece and not from an auto-parts store.
what do you meen by "improper use of valve cover breather tube"?

its got to be the pcv valve because the valve cover breather tube has no oil in it.
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Old 03-05-2008, 11:00 PM   #16
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By "improper" I mean routing it to the wrong place... like to the charge pipe or not routing it at all and just putting a filter on it. And it might not have any oil in it now, but only while under boost. And it might not be the PCV valve... you could have blown rings or a leaky headgasket that isn't severe enough to matter in vaccum but leaks a little pressure into the crankcase while under boost.
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Old 03-05-2008, 11:44 PM   #17
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my valve cove tube is run between the turbo and AMF. i ordered the 323 gtx PCV valve today so lets hope its that.
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