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  #1  
Old November 13th, 2007, 05:34 PM
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steve
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tdi blue smoke

approx 110k on engine. Only when the engine is cold, I get blue smoke when engine braking down hill. Once it is warm it goes away. Engien runs like a champ otherwise. (only reason I noticed is because I moved up a hill)

What do you think:
1. Normal?
2. Valve stem seals?
3. Turbo Seals?

If 2 or 3... worh fixing or wait a while?? if it is the valve stem seals what else should I look in to changing in the head??
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  #2  
Old November 13th, 2007, 06:41 PM
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EDWARD BAHAW
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I noticed the same thing with my disco (tdi 300) It has 89,000km.

Is the oil level going down in yours?

Mines has a small leak as well and the oil level goes down at a faster rate that the rate of leakage ...at least I think so!!!
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  #3  
Old November 13th, 2007, 10:34 PM
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Just up the fuel so the black smoke drowns it out.
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  #4  
Old November 13th, 2007, 11:43 PM
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John B.
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If it is only on overrun, your timing is retarded. The timing belt probably has relaxed with time. When was it last changed?

Anywho, advance the timing.
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  #5  
Old November 14th, 2007, 11:08 AM
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steve
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Smile

Thanks for the replies guys-

I loose a little oil, but leak most of it. I would not say I have excessive oil consumption.
Buck- I already have plenty of black smoke

Timing belt is 4k old so it is new. Should I readjust timing?... if it is timing why does it go away when she warms up??

Last time I cleaned my intercooler it was really gunked but it was a while before it was cleaned before...mabye never... It is my understanding that oil will be in the intercooler and that is normal... is that right??
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Old November 14th, 2007, 11:16 AM
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jim pendleton
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Quote:
Originally Posted by D90user
Timing belt is 4k old so it is new. Should I readjust timing?... if it is timing why does it go away when she warms up??

Last time I cleaned my intercooler it was really gunked but it was a while before it was cleaned before...mabye never... It is my understanding that oil will be in the intercooler and that is normal... is that right??

If something is different from before, you might check the belt timing at least. It is easy to check without much dis assembly.

JP
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  #7  
Old November 14th, 2007, 12:25 PM
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steve
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Pendy-
Not sure if it was any different. The only reason I noticed now is because I moved to the top of a hill and noticed the blue smoke when going down the hill when the engine is cold.

Is there any amount of blue smoke that would be considered normal when cold??
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  #8  
Old November 14th, 2007, 01:41 PM
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John B.
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When warm, the engine can better burn the fuel. These engines don't compensate for engine temperature, so overfuel when cold.

The oil in the intercooler comes from the PCV system (normally)

Was the timing check after the initial setup? It is best to recheck the timing after a little run in period.
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  #9  
Old November 14th, 2007, 07:29 PM
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Julien Dalbin
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If you're tired of cleaning your intercooler, you can take out the hose
that goes from the oil breather to the air intake system, plug the side
in the air intake and let the oil breather side run to the pavement.
That will keep your air intake system oil free, so you'll have a little
(very little...) bit less smoke.
You can also install an improve oil breather, made in alloy by Darton
fabrication (UK). It's a little bigger than stock unit and it looks damn good.
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  #10  
Old November 14th, 2007, 07:46 PM
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jim pendleton
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Allisport makes a bigger breather now as well.

JP
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  #11  
Old November 15th, 2007, 06:44 AM
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Gren Thomas
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Hi Steve.
blue smoke on overun is normally valve stem seals, the seals pass a little oil when stood long enough for the engine to go cold, when the engine is warm the seals soften slightly and give a better seal. also the the heat on the valve stems & guides helps dry up the slight oil leaking down them when running only to allow it to pool on the valve when cold ready to burn when started.
replacement is cheap and easy and is best done with head off and a quick valve job at the same time to remove the burnt oil residue
you could try an oil additive to soften the seal to prolong thier life it may work.

regards

Gren
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  #12  
Old November 15th, 2007, 11:07 AM
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John B.
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Quote:
Originally Posted by Gren_T
Hi Steve.
blue smoke on overun is normally valve stem seals, the seals pass a little oil when stood long enough for the engine to go cold, when the engine is warm the seals soften slightly and give a better seal. also the the heat on the valve stems & guides helps dry up the slight oil leaking down them when running only to allow it to pool on the valve when cold ready to burn when started.
Not on a diesel.
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