Result of Turbo Seal Failure - Page 2

boosted79 · 12:11 PM

Good time to move up to a modern turbo.

WERK I · WERK I's Garage

Here are pics of the turbine. Pretty bad. Judging from the scoring on the housing, the turbine may have jammed. btw, this is the original K27-7006 supplied by Porsche when they modified the 3.3l engine for increased BHP.

boosted79 · 12:40 PM

That's toast. I'm looking at a Borg Warner for my 3.3 CIS.

Jerry S · Jerry S's Garage

Hi,

I had a similar looking head recently that looked like that due to consumption, and what actually worked nice was we screwed in spark plugs to prevent galling threads, left valves closed so that seats would be ok and used an air screwdriver with a light abrasive wheel (soft wire) and lots of brake clean and compressed air. cleaned it up real nice with no issues.

Only thing is, be very careful around the sealing faces. You do not want to take metal, and just the oil/carbon.

Sounds scabby, but worked well for me, and engine runs well.

JS

WERK I · WERK I's Garage

Mark,
Thanks for the tip. I was thinking of using a rotary brass wire brush. Something softer than the aluminum alloy heads, but going to try bead blasting first. Won't breakdown the oiliness, but if it breaks up the carbon, then I can clean up the combustion chambers with a scotchbrite pad.

I used the Berryman's on the pistons. Soaked for 1 hour, then soaked in Dawn hot soapy water. Used a plastic scraper, then a green scotchbite pad to scrub carbon off, rinsed with warm water, dried with cotton cloth. Came out great!

boosted79 · 06-29-2016, 03:52 AM

The Berryman's is great stuff. I thought you were going to soak the heads? Do the same thing you did to the pistons only soak longer. A lot less work and mess than the mechanical method. Try putting the plugs in and fill the chamber with the B'man's, if the seats are good it shouldn't leak out.

WERK I · WERK I's Garage

Quote:

Originally Posted by infraredcalvin

...

Please post pics of your results, I've always been skeptical of that stuff, so have never used...

Thanks, and Good Luck!

Pat,
I soaked the cylinder bank 1thru3 in Berryman's 30 hours with the results shown in the pic below. While the solution did a very good job of removing oil and grime from the other parts, it had very little effect on the carbon buildup in the combustion chambers. Berryman's could not soften the coked oil in the combustion chamber. Maybe dino oil would be a different story, but coked synthetic oil is some tough crap.

Note: The areas around the valve seats I cleaned with a brass brush. It's off to the bead blaster on Tuesday......

WERK I · WERK I's Garage

Picked up the heads from the machine shop. Much better results with bead blaating.

Before - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -After

Speedfab · 07-10-2016, 07:43 PM

Werk1: Looking at your turbine pictures, that damage to the inducer is from FOD, and it came from somewhere upstream of the turbo. Make finding out what caused THAT priority one. It can be anything from slag that broke loose in a header to a broken exhaust guide or worse. I assume from the plugs in the head pictures that the air injection nozzles are long gone?

WERK I · WERK I's Garage

^^^I don't know how the turbine wheel suffered its demise. It could have happened when the turbine wheel came in contact with the turbine housing or if it's from FOD. The B&B headers were put on when I rebuilt the engine in 2002 (15K miles ago). The air injection plugs were put in the ports at the same time. Hard to believe the headers gave up so soon, but anything is possible. Anyway, everything upstream, fortunately, looks tip-top.

I hate the B&B's. Craftsmanship isn't all it's cracked (and there are plenty of those) up to be. That's why I just purchased a set of Fabspeed's. I may lose 10 or so horses, but their craftmanship is so-o-o-o much better than B&B.

Speedfab · 07-11-2016, 08:19 PM

It isn't from contact with the housing, that causes a different kind of damage. When the tips of all the turbine blades are broken off like yours are, it means something came down the pipe and hit them. Whatever it is may still be stuck somewhere in the scroll of the turbine housing. I'd be relentless in finding out what did it.

WERK I · WERK I's Garage

I have been "relentless" and I am telling you can not find anything wrong with the heads. Nothing wrong the valves. Nothing wrong the guides. Nothing wrong with seats. Nothing wrong with pistons. You can not ignore the scoring on the turbine housing. I sure as hell did not put it there.

Rawknees'Turbo · 07-11-2016, 08:57 PM

Dave, what an improvement after the blasting! I'm surprised the Berryman's didn't do more with the coke, butt you're right, that shart is harder than Paul's, beef-jerky-like rear end (

) once it's baked on like that!!!

WERK I · WERK I's Garage

Maybe Paul needs a referral to the machine shop that did my heads.

Rawknees'Turbo · 07-11-2016, 09:16 PM

^^^

Nothing like a good bead blasting to address one's personal hygiene and/or grooming needs (so I hear)!!! Expect a PM contact from Paul in short order!!!

Speedfab · 07-11-2016, 09:55 PM

Quote:

Originally Posted by WERK I

I have been "relentless" and I am telling you can not find anything wrong with the heads. Nothing wrong the valves. Nothing wrong the guides. Nothing wrong with seats. Nothing wrong with pistons. You can not ignore the scoring on the turbine housing. I sure as hell did not put it there.

Sorry, I sure didn't mean to imply you weren't being thorough. Sent you a PM.

WERK I · WERK I's Garage

Quote:

Originally Posted by Speedfab

Sorry, I sure didn't mean to imply you weren't being thorough. Sent you a PM.

Absolutely, no harm, no foul.

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Gents/Ladies,
We have another turbo expert in our mist. Speedfab (Tracy) pm'd me with his background in turbochargers.......30 years! Welcome aboard Speedfab. Hope you enjoy being on the forum. Great group of people, almost human, and fanatical in their love of 930's.