Turboman
Mab An Gov
Use all new seals, every time.
Because poor fuel atomisation will result in a lot of unburnt fuel when the engine is cold, but more fuel will atomise when it goes into a very hot cylinder.
tottot
Well-Known Member
Diesel is an oil,a fuel oil. An incomplete combustion as when cold will result in blue smoke.
Black smoke comes with a good combustion but to much fuel resulting in an excess of visible particles in the exhaust.
Have you tried injector cleaner? Can often help although your's is not that bad.
Black smoke comes with a good combustion but to much fuel resulting in an excess of visible particles in the exhaust.
Have you tried injector cleaner? Can often help although your's is not that bad.
Last edited:
Turboman
Mab An Gov
Judging smoke colour and smell takes experience!
Diesel is an oil too, just a much thinner one than engine oil. And sometimes there may be both in the exhaust gases. And always mixed with water vapour, especially when the exhaust is cold.
Might be an idea to get someone who knows what they are looking at to have a look at it, do you have a mate that is a diesel fitter or mechanic?
Or you could pull the injectors and have them tested, never does any harm, they can do a lot of damage if they get really worn.
Tappets are set correctly, not checked pump timing.
I worked as a mechanic for 5 years (not done it for years mind!) but only on Petrols, and mainly classic Aircooled ones at that. The smoke smells just like burnt oil in an Aircooled engine that's overheated, tinged with Diesel. That's the best way I can describe it, lol.
I understand diesel is a fuel oil but surely a lot would need to be leaking to cause blue rather than black or white smoke on startup?
I worked as a mechanic for 5 years (not done it for years mind!) but only on Petrols, and mainly classic Aircooled ones at that. The smoke smells just like burnt oil in an Aircooled engine that's overheated, tinged with Diesel. That's the best way I can describe it, lol.
I understand diesel is a fuel oil but surely a lot would need to be leaking to cause blue rather than black or white smoke on startup?
Turboman
Mab An Gov
Not much, read my earlier post re cold engines!
I do wonder if you are reading too much into it, if your vehicle runs well, and passes MOT emissions test, there is not too much wrong.
Old diesels tend to smoke a bit on start up, my tractor certainly does, fills the shed on a cold morning, but it is still well up to a long days silaging!
14 months, had 73k on it when I bought it, now its just ticked over 79k. Done loads to it and spent a fortune on it. It does spend long periods not moving though (weeks at a time).
It did sound lumpy when I got it but new pushrods (couldn't see any bent ones but changed anyway as a precaution) and tappets set right cured that.
Fully serviced it back in November and it's done maybe 600 miles since then.
It did sound lumpy when I got it but new pushrods (couldn't see any bent ones but changed anyway as a precaution) and tappets set right cured that.
Fully serviced it back in November and it's done maybe 600 miles since then.
Last edited:
tottot
Well-Known Member
Was asking because diesels smoke more on start up when temp is low. And every time you start a 200tdi the automatic excess fuel system kicks in resulting in blue smoke when cold and a puff of black when hot. [gets one dirty looks in the car park] but that's the way it is with a 200.
