Have my turbo seals gone bad?

[RevRon]

'79 930 running fine and strong. But after I taught a Mustang quarter horse a lesson Fri night I noticed on Sat a large cloud of blue smoke during a full throttle blast. Never noticed this before, nor can I produce it under "normal," low-boost driving. The engine is a practically new, 3.3 with K-27 turbo, B&B exhaust 1.0 spring, big intercooler, etc.

Is this the sign of turbo seals going/gone bad.

Thanks for your help,
Ron

[JFairman]

No, there's a lot of thongs that could be. Make sure the engine isn't over filled with oil and then make sure your turbo scavenge pump is working.
Remove the suction hose on the drip tank and stick it in a container of motor oil and start the motor. It should suck the oil up quickly with strong suction. If it doesn't the drive pin for the pump may have a problem or the oil line may be clogged or something.

If thats not the problem look inside both turbo housings for oil and if they are dry start removing spark plugs to see which ones are wet with oil. If the turbo housings are wet with oil it may have a problem especially if it was built with after market Chinese or ebay parts.

[RevRon]

JFairman,

Thanks for the ideas. It definitely is not overfilled with oil. I am not sure what the "turbo scavenge pump" is, but I will check that out next.
Would I have to take the turbo off and disassemble it to "look inside the housings?" I assume that means the housing on the turbine side, and the housing on the compressor side? May be easier to pull the plugs out and look at them first, although the car is otherwise running great and not blowing oil unless hard on the turbo. The engine had been rebuilt when I got the car, supposedly by Brumos, but I don't know about the turbo.
Ron

[JFairman]

Yeah, I'd remove the plugs first and see if all of them have burned oil deposits on them or are wet with oil.
If some are dry and normal looking and others are wet with oil that sounds like that cylinder is burning oil. If all of them have burned oil deposits then it's probably the turbo or turbo scavenge pump.

You don't have to remove the turbo to get an initial idea whats going on.
If the compressor side of the turbo is blowing oil you can remove the intercooler and look and feel down inside the air exit part of the compressor housing and if it's wet with oil something is wrong. It should be dry.
You have to remove the muffler to see if the exhaust turbine side is wet with oil.