TURBO OIL TEMPERATURE

[Ameer Antar]

I had a similar problem on my 5kT. I thought it was the return pipe. WRONG! 
The supply line is usually the culprit. The supply line is rubber w/ a 
stainless steel jacket, but the end fittings are regular steel which rusts 
esp. w/ that hot turbo there. The return pipe is a very special item. It is 
made entirely of metal, so it very rarely goes bad. And if you ask someone 
to build you a new return pipe, make sure it's all metal, otherwise you'll 
be in trouble. Look very carefully at the supply line w/ a flashlight w/ 
the engine running. You still might not be able to see it, since you can 
only see the front. In my case it was just the supply line leaking down 
onto the return line. Only after I removed it, and held it up to the sun, 
could I see a tiny pinhole leak in the cast end fitting. The supply line is 
a bit cheaper. I would by the original part. Custom hoses have a tendency 
to be more of a pain than the difference in price, and if the fittings are 
leaking as mine were, you have no choice anyway b/c no one has fittings 
like those. Good luck and let us no what you find.



At 01:47 PM 9/18/00, you wrote:
>I have noticed for some weeks now that my car is dripping oil on the
>garage floor and have located it as comeing from the oil return pipe from
>the turbo.
>Please correct me if I am wrong here but when the car is not running there
>is no oil in this pipe as it will have drained into the sump. When I
>removed the pipe there was no oil in it. So if this pipe is dripping
>without the engine running when it is running and there is oil under
>pressure in the pipe it must be spraying out. However I cannot see any
>sign of this under the car but oil consumption has increased.
>What pressure do you think is in this pipe. The supply pipe I would think
>is at the pressure that would be shown on a pressure gague if I had one
>fitted in my car say about 4 bar. But as the return pipe is twice the
>diameter it may be 2 bar.
>Audi quoted a price of 120 gbp plus tax but I have found a local company
>that will make me a pipe for 30 gbp. My main concern is what temperature
>the rubber part of the pipe has to cope with. I'm a little confused here
>because I know turbos can get to hundreds of degrees but oil cannot cope
>with anything like this. So I guess the oil passes quickly through the
>turbo to avoid breaking down. I need to tell the guy how hot this hose
>will get.
>Thanks in advance..
>
>Simon Holtby
>'84 urq
>
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