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Uh oh turbo k27 7006

Spoke to the turbo rebuilder today and all does not sound good.
He sent a pic to my phone of the turbine wheel which looks as if has been shot at. He sumised that something from the exhaust has probably hit it. Now the good news is he will rebuild it with Borg Warner factory parts, turbine wheel and with machining over size bearings. The bad news is it is a $1700 exercise and I now need to find what has exited the engine and destroyed the turbine wheel.
Would a compression test be the first point of call and is it OK to turn the motor over without the exhaust, intercooler and scavenge pump connected?????

Help!

Thanks in advance.

Ps. The old parts will be sent back with the rebuild and I will post pics then.

Old 01-29-2017, 11:31 PM
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who id doing the rebuild.

sounds a bit hi. I think I would upgrade for that $$.

perhaps parts down the intake.

you can turn it over. you planning on starting it?
the oil supply will pump oil out.
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 01-30-2017, 04:42 AM
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Why wouldnt you just buy a new turbo? Isnt a K27 7200 an upgrade? I think you can buy one of those for around $1200. The cost of the rebuild sounds really high.

Quote:
Originally Posted by SBK930 View Post
Spoke to the turbo rebuilder today and all does not sound good.
He sent a pic to my phone of the turbine wheel which looks as if has been shot at. He sumised that something from the exhaust has probably hit it. Now the good news is he will rebuild it with Borg Warner factory parts, turbine wheel and with machining over size bearings. The bad news is it is a $1700 exercise and I now need to find what has exited the engine and destroyed the turbine wheel.
Would a compression test be the first point of call and is it OK to turn the motor over without the exhaust, intercooler and scavenge pump connected?????

Help!

Thanks in advance.

Ps. The old parts will be sent back with the rebuild and I will post pics then.
Old 01-30-2017, 06:40 AM
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To me, that doesn't add up. If your engine is healthy, there shouldn't be any FOD.

Sounds like you're being had IMO.
Old 01-30-2017, 07:11 AM
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^^^ I've seen engines that ran for thousands of miles with the top ring land broken off and no indication there was a problem. My guess is that is what has happened.

You could perform a compression and leak down test to isolate the cylinder. If I had a turbine damaged from something that came out of the engine I would be tearing it apart.
But if its a valve are you only going to do one valve?
If its a broken ring land or ring are you only going to do one piston?
Probably no on both of those. If it's my car the engine is coming out and getting rebuilt.
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Last edited by 1979-930; 01-30-2017 at 07:24 AM..
Old 01-30-2017, 07:20 AM
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7006 is a better turbo than a 7200- more power up top. That cost to rebuild does sound high however.
I would pull the air injection spider tubing off the exhaust ports and see if you are missing any tips of the air injector nozzles. They can burn off and go downstream.
I wouldn't automatically get into a $15-25k rebuild without a smoking gun.
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Old 01-30-2017, 07:30 AM
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You've been quoted a ridiculously high price. Probably a rip off.
Who's rebuilding it?

Someone said or thinks a k27 7200 is an upgrade from a k27 7006. It is not - the 7006 is more durable than a 7200 and makes more power above 5000 rpms.

If the original lambda oxygen sensor is still installed before the turbo some of it could have broken off and went through the turbine housing causing the damage.

It would cost a lot less to just buy a new journal or ball bearing Garret turbo and whatever is needed to install it. The performance would also blow away anything from 3k Borg Warner in a big way.

Call Turbokraft, the owner Chris posts here and he'll take care of you.
Whats left of the 7006 is probably still worth something if it's an original 3k one.
Old 01-30-2017, 07:33 AM
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I must say it sounds expensive, to that I can add that I am in Australia and with the conversion it probably equates to around USD $1200.
I loved the performance and are happy to use this turbo again.
Not being completely comfortable with the mechanicals of this engine I am unsure how to do a compression test on a warm engine without the intercooler,exhaust and scavenge pump being installed.
I will check the oxygen sensor if I can find it and also check the air injection nozzles again if I can locate them.
Old 01-30-2017, 10:54 AM
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Hi, yes $1700 sounds like quite a high price, even for genuine -7006 series parts. Not sure who is doing your turbocharger, but there's lots of counterfeit 3K-Warner parts on the market and sometimes rebuilds end up dong more damage (i.e. over-bore the housing). Email or call me if you want to discuss, we can get that done right.

Engine: do a leakdown test, not a compression test. FOD (Foreign Object Damage) to a turbine wheel is usually from the air injection nozzles as mentioned, or from cheap aftermarket headers (OBX, Schnell, etc) weld slag, not from a piece of exhaust valve (though we have seen that before...)
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Old 01-30-2017, 11:11 AM
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IIRC Durabuilt rebuilt a 3LDZ for us a while back that needed a complete cartridge (major job) and it was somewhere in the ~$1200 range. From what I understand that was about as bad as it could get in their eyes.
Old 01-30-2017, 11:15 AM
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durabuilt did my 7006. I think it wa around 600. even with new shaft

what turbine is damaged, the input or the output
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86 930 42kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
05 BMW 330CI 130K:: [__] RUNNING: [__] NOT RUNNING:
08 VOLVO V70 190K:: [__] RUNNING: [__] NOT RUNNING:
90 B2200[__] RUNNING:[] NOT RUNNING:__2000 MER E320 WAGON [] WRECKED:[]RUNNING:
Old 01-31-2017, 04:02 AM
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$1200 USD is about right if the impeller is damaged.
That is also the least expensive route to get you back on the road. The turbo you have now (7006) is plug and play. A 7200 will cost at least $1500 new, also plug and play. Anything aftermarket will be more expensive when all complete and not plug and play.
On the other side, this is your chance to try something else if you wish.
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Old 01-31-2017, 05:01 AM
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Quote:
Originally Posted by T77911S View Post
durabuilt did my 7006. I think it was around 600. even with new shaft
what turbine is damaged, the input or the output
The steel shaft and inconel exhaust turbine wheel are one piece and can not be separated. I guess the turbine wheel is welded to the shaft somehow. The aluminum compressor wheel is held on to the other end of the shaft with a nut.
Then it's high speed spin balanced.

$1200 to repair one sounds high. A new Garret isn't much more.
Old 01-31-2017, 07:48 AM
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I just looked back through the file - the full rebuild incl. new turbine wheel and shaft, compressor wheel, and honing of the bearing housing was just under $1,000. Hopefully this helps.

For what it's worth as a customer I cannot recommend Durabilt turbo enough for their excellent quality of work and customer service. Give Vicki a call for any turbo rebuilding needs! They also sell new KKK units.
Old 01-31-2017, 08:34 AM
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For KKK or 3K Borg Warner turbo rebuilds Durabilt is best.
They have the high speed VSR turbo balancing machine.

Durabilt Turbo - Turbo Rebuilding | Bradley, IL
815-939-1399
2 Bradford Pl, Bradley IL 60915
Old 01-31-2017, 09:08 AM
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The turbo is being rebuilt by GCG turbos, they come highly recommended and have been doing so since 1979. From what I understand they are possibly the best equiped and experienced rebuilders and sellers of turbos here in Australia servicing all turbos for race, trucking, mining and agriculture.
It is the turbine wheel that has been damaged that is the hot or exhaust side. Therefore the rebuilder has to replace the turbine wheel and shaft, machine for oversize bearings, remove and replace the studs along with the rest of standard rebuild and balance.
I have not had a chance to check the air injector nozzles, but I understand this system can be removed including the pump if it is still installed as emission would not be a great issue here.
I will try to locate the thread on this here at Pelican. And also purchase the block off parts.
Old 01-31-2017, 10:59 AM
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Why the need for oversized bearings if going with a replacement shaft?
Old 01-31-2017, 12:12 PM
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Quote:
Originally Posted by Tippy View Post
Why the need for oversized bearings if going with a replacement shaft?
Not sure but I think it's something like the bearing housing that gets honed.
Old 01-31-2017, 01:43 PM
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Is it a must to use a 3K again?
Old 01-31-2017, 02:43 PM
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Quote:
Originally Posted by Tippy View Post
Is it a must to use a 3K again?
No.
No real need to use a KKK again, however I was really happy with the performance. I have had a 325kw Clubsport (Holden sedan) and it was like riding a lawn mower compared to my 930.


Last edited by SBK930; 01-31-2017 at 03:33 PM..
Old 01-31-2017, 03:31 PM
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