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Turbo heavy Smoking....need help...

Hello..

Today i drove my turbo 911, and suddenly there was lot of smoke, i thought there was a broken ring or more....

Then i realized turbo was leaking burned oil right from the middle (started just as a drop of oil time to time)..

But today was so much smoke i had to stop the car, and forget about driving..


One funny thing i realized is that as i brought down the turbo, i noticed i could twist both sides of it with my bare hands.. is this normal?...


Im posting some pictures for you to help me find out what is wrong..

There seems to be a clamp that keeps both parts together...this one is lose..

Propeler both sides, seem firm, but exhaust side is black because of burned oil..

Should it rebuild it, get another turbo, or just adjust the clamp in the middle.. sorry about cel pics...


Any thoughts?... car was running perfect before this cloud of heavy smoke..




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MKEDF, 911 78 SC (rebuilt), 75 S Turbooo!!
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2001 Peugeot 406 Pinifarina Coupe, 2001 325 I (E46), 2000 328 I (E46)
Never Bought Audi or Cooper too expensive for what you get

Last edited by MKEDF; 01-30-2008 at 09:38 PM.. Reason: poor def pictures
Old 01-30-2008, 09:32 PM
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Tried tightening the clamp holding it together and installing it back? Does it leak internally or extternaly? How's shaft radial play?
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Old 01-31-2008, 04:52 AM
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Yea, I dont think turbos are supposed to come with the "swivel option", try tightening the clamps like Goran suggests. However the oil on your exhaust wheel does not look too healthy- how old is the turbo and what kind is it (cant tell from the picture). Why is that A/N line apart in the picture, could that have been a leak?
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Old 01-31-2008, 05:35 AM
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Well if turbine housing starts dislodging itself from CHRA I bet some oil will weep past the seals and get thrown around in housing by turbine wheel, to be turned by the smoke later on.

I would remove turbine housing to check for rubbing on turbine blades. If everything is OK, put it back, tighten the clamp and make sure your (homemade?) AN line fitting doesn't leak either.

It *might* be that easy. Worst case, there is play in the bearing, rear seal is shot or turbine blades rubbed. But with little luck, everything is still OK, just greasy
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Old 01-31-2008, 06:27 AM
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Hey MKEDF, How does the oil drain from your turbo? Does it have it's own sump w/ a scavenge pump running off the camshaft? If so you may have trouble there. I don't think the clamp would let it leak oil, if it were running fine and just started smoking like hell. If the clamp was the culprit you would probably hear some terrible noises and most likely a loss of boost as well. However, if you have scavenge or drain trouble, it would probably run ok but smoke like crazy. Of course it could always be too much oil, (we've probably all done it once) or just a bad turbo. Any history on the puffer? Just a thought, hope it helps. Judging by your profile I'm guessing this is your '75 S?
Old 01-31-2008, 03:24 PM
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I just had a similar issue with my original 3LDZ on my 76, but without the "swivel option". Mine used to smoke at startup and run fine afterwards. Every once in a while it would blow a little smoke in 4th gear full boost going uphill. Then one day on the same hill I started blowing major smoke, and boost levels dropped when should have been at full boost. The turbo seals went out. I was planning on upgrading my turbo anyway, so I replaced it. I had a little shaft play in the turbo but not much, nothing rubbing, etc. But when spinning as fast as that does, it doesn't take much. I had about a 1/2 cup of oil that poured out of the outlet housing when I removed it, so I know it was the seals.
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Old 01-31-2008, 07:30 PM
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Issue, turbo..

You all have part reason..

I have dissasembled the turbo, 3LDZ type (original for 1977 930)...


The seals are gone, the clamp was so lose you could play with it...

The center axle is steady, the spins are on great shape, needed to install new bushings, full service to it, so we disassemble completely, and full service provided to my turbo..

Im reattaching it to the 930 engine tomorrow, and will come back here and let you know if my putt putt is back on the road again..

Thank you all..

MiCk...

PS Btw... how far is this one from a k27, what should i do to upgrade in the near future?
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MKEDF, 911 78 SC (rebuilt), 75 S Turbooo!!
2001 Boxster (Sold, girl car), 2001 330CI Coupe, 2001 325I, 2001 C240 V6
2003 330 I F1 (E46), 2002 320 I F1 (E46), 1999 323 I (E46)
2001 Peugeot 406 Pinifarina Coupe, 2001 325 I (E46), 2000 328 I (E46)
Never Bought Audi or Cooper too expensive for what you get
Old 02-01-2008, 07:19 PM
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The K27 is a much better turbo than the 3LDZ. I bought a K27HFS to replace mine from www.imagineauto.com
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Old 02-02-2008, 01:18 AM
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It was just like a rebuilt engine..

As i reinstalled the turbo on the 930 engine, it was started again, and it worked just like this had been just rebuilt..

AS it was smoking right before removing because of the oil leak, i had to leave the engine runing untill the oil was smoked..

This was just like rebuilding the engine and starting for the first time, i had to crank the engine to allow oil to be pumped to the turbo, this to avoid new bushings to be scratched...

Still smoking, this because of the large amount of oil dumped by the turbo on the pipes...

I guess this smoke will take a while to go away, im looking forward to ride my putt putt again tomorrow and finally get over this turbo failure...

Thank you all....

MiCk..
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MKEDF, 911 78 SC (rebuilt), 75 S Turbooo!!
2001 Boxster (Sold, girl car), 2001 330CI Coupe, 2001 325I, 2001 C240 V6
2003 330 I F1 (E46), 2002 320 I F1 (E46), 1999 323 I (E46)
2001 Peugeot 406 Pinifarina Coupe, 2001 325 I (E46), 2000 328 I (E46)
Never Bought Audi or Cooper too expensive for what you get

Last edited by MKEDF; 02-02-2008 at 08:48 PM..
Old 02-02-2008, 08:45 PM
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