84 240 Ti--turbo unit smokes

  • Thread starter Thread starter Greenthumb
  • Start date Start date
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Greenthumb

Hi,

I am working on a project car, an '84 240 Ti with 199K+.

It is finicky.

After I finally got it running again, smoke began to pour off the
turbo unit.

I tried to see if I could spot an oil leak somewhere dripping on it
but did not find one.

Anyone have a clue?

How could it smoke from within itself----or must it be related to an
oil leak somewhere external to it?

I am no stranger to automobile engines--but this is my first turbo
ever.

Any ideas for me to chase down would be very much appreciated.

Allan Ballard
aballard AT ix.netcom.com
Atlanta, GA
84 240 Ti 199K
89 240 195K
 
Greenthumb said:
Hi,

I am working on a project car, an '84 240 Ti with 199K+.

It is finicky.

After I finally got it running again, smoke began to pour off the
turbo unit.

I tried to see if I could spot an oil leak somewhere dripping on it
but did not find one.

Anyone have a clue?

How could it smoke from within itself----or must it be related to an
oil leak somewhere external to it?

I am no stranger to automobile engines--but this is my first turbo
ever.

Any ideas for me to chase down would be very much appreciated.
Click to expand...

If smoke is coming off the turbocharger itself under the hood my guess is
the bolts are loose or the gasket has failed where the oil line connects to
the center cartridge.
 
My 83 turbo had two problems that made it smoke, the 13 mm bolts that
hold the turbo body together had loosened a bit, and the other item
was the crankcase vent system, wat under the block on the left side
with a long hose running from over by the air cleaner, needed a good
cleanout.
 
Thanks to Mr. Sweet and Mr. Roden.

I finally sorta almost understand how the turbo hooks into the engine
systems now.

What you say makes sense. Loose bolts of one sort, or another, or
both.

May I ask you a followup question?

To remove the turbo...does one have to remove the exhaust header
to get at the mounting bolts underneath?

Thank you.
Allan Ballard
 
Thanks to Mr. Sweet and Mr. Roden.

I finally sorta almost understand how the turbo hooks into the engine
systems now.

What you say makes sense. Loose bolts of one sort, or another, or
both.

May I ask you a followup question?

To remove the turbo...does one have to remove the exhaust header
to get at the mounting bolts underneath?

Thank you.
Allan Ballard
 
Greenthumb said:
Thanks to Mr. Sweet and Mr. Roden.

I finally sorta almost understand how the turbo hooks into the engine
systems now.

What you say makes sense. Loose bolts of one sort, or another, or
both.

May I ask you a followup question?

To remove the turbo...does one have to remove the exhaust header
to get at the mounting bolts underneath?

Thank you.
Allan Ballard
Click to expand...

Yep, the bolts go in from the back, through the manifold into the turbo.
There's also some special locking plates which should be replaced when you
take it apart. Often you don't have to remove it from the manifold though,
the cartridge can be removed with it in place. Just be *very* careful trying
to disassemble the turbo, the bolts are usually heavily rusted and stuck
from thermal cycles, they're also quite brittle and easy to break off. Lots
of catalysing penetrating oil and heat from a propane torch help a lot.
 
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