oil control

[Roy Browning]

You wrote: 
>
>Hey all you turbo gurus......
>
>Anybody have trouble containing oil in the turbos?  I have a setup 
with 2
>brand-new turbos that leak oil badly into the hot section causing 
great
>billows of blue smoke.
>Application is SBC with high volume oil pump which delivers about 90 
PSI
>cold.  Oil supply lines are #4AN and drains are #6AN back to top of 
oil pan
>just below the block.  I'm having trouble believing that BOTH units 
could
>have been assembled improperly.  Is the oil seal a mechanical unit or 
does
>it have some sort of "packing gland" that can be replaced?  Could I 
have
>damaged it by excessive pressure, or could I just turn down the 
pressure and
>hopefully solve the problem?  I've never read anywhere that too much 
oil
>(pressure) is  bad for these things.
>
>Thanks in advance for any help you might provide.....
>
>                                                                       
     
>     Bill
>
>
The seal in the exhaust end of most turbo units consist of a single or 
dual piston ring type seal with a mechanical slinger to keep most of 
the oil away from the ring. if there is an oil leak then they must be 
replaced. If someone rebuilt one turbo incorrectly it is very 
conceivable that two or more were done so. I have had about 25% of the 
rebuilt turbos I have installed fail within a few hundred miles. The 
turbo seals are very critical and difficult to rebuild to exact 
tolerances.

Best of luck,

Roy