Turbo D Bx burning oil

Gavin1 · Unread post by **Gavin1** » 28 Jan 2004, 01:33

My TZD turbo Bx has a problem - whenever the engine idles and I pull off the car emits large amounts of oil smoke. Once the car is moving you can accelerate as much and as hard as you like without the car smoking. Once you come to halt and move off again the smoke returns. Funny thing is once the oil level drops the oil smoke almost dissappears but the last thing I want to do is run the engine when it is low on oil. Any ideas?
Cheers

jeremy · Unread post by **jeremy** » 28 Jan 2004, 01:43

do you know if the smoke is unburnt diesel or lubricating oil? What is the lubricating oil consumption? Does the car start well? Run well otherwise?
Could be many things from a worn block to worn injectors - so a little more information could be helpful.
jeremy

Gavin1 · Unread post by **Gavin1** » 28 Jan 2004, 01:50

Def oil smoke, its got a blue tinge - it uses oil then once the oil level has dropped it stops smoking and stops burning oil. Its not black diesel smoke.

AndersDK · Unread post by **AndersDK** » 28 Jan 2004, 02:53

It's correct that the blue tint on the smoke is engine oil.
An overfuelling diesel will give black smoke.
You have observed the problem is related to engine oil level in the sump.
You should then suspect a problem in the sump vent/fume hoses.
You observes the correct amount of oil re-filled on oil changes ?
As the oilsmoke is blue - it arrives at engine intake side and is burned - hence the blue tint.
If the oilsmoke was white - it would arrive directly into the exhaust - and then vaporises giving a white tint - much like condensation or water in the exhaust.

jeremy · Unread post by **jeremy** » 28 Jan 2004, 03:06

I agree Anders. If it was a petrol engine I would suspect valve oil seals but diesels don't have them and I've never heard of problems with the bronze guides.
Unburnt fuel needn't necessarily be black. If I don't start my TD properly - ie don't heat it and it cranks over a few times white smoke (admittedly not much) is produced.
Sorry to be a Jonah but is there much piston blowby? Do clouds of fumes ome out of the filler cap if it is removed while the engine is running? If so then your engine is suffering from ring/bore wear. It will go on for a long time like this until either the rings on one piston break or you get fed up with it. If this is happening generally oil emerges form all over the engine and you are never able to seal the gaskets properly due to the crankcase pressure.
jeremy

NiSk · Unread post by **NiSk** » 28 Jan 2004, 18:02

I'd say its definately something to do with the crankcase ventilation - either you have blow-by generating high crankcase pressure and forcing oil up through the venthose or the vent hose is blocked with mayonaise, which also increases the crankcase pressure.
//NiSk