Super smokey!

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Fatforbes182

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HEllo, Ive got a defender 300tdi p-reg and every morning i start it it smokes really really bad until i get a mile or two down the road. It also takes a long time to pick up on accelaration, it also smokes if i apply power gently down hills :confused:. The smoke is hard to describe. Its almost a blend of white/grey and smells oily and fuel like:confused: very hard to say. I've had the injectors tested thinking one maybe faulty but they're fine. i don't know if im right in saying it could possibly be a timing problem? I also thought it could the valve guides/seals but they are fine.the fuel filter has been changed and there is no sign of a headgasket problem . but if it isnt the timing what else is it likely to be? rings:confused:? the smoke is so bad i cant see anything out of my rear window :(. help pleaseeee
 
im pretty sure there isnt any water loss tho :confused:. i could be mistaking white for grey, it may even have a tint of blue when reved hard. apologise about my vagueness!
 
Oily smell and white smoke is unburnt fuel isn't it? Do you get a fair bit of black smoke if you thrash it?
 
How long has this been happening? If only a new occurence I would suggest that your cam belt has jumped a tooth.
 
Hello mate, check your rubber hoses the one on the top that comes out of the intercooler and especially the 90 degree one that goes into the turbo. What you are looking for are signs of it delaminating inside. If this is happening it's starving of air which will give you loads of smoke and lack of power. Another way of checking is to get someone to rev the engine and watch the hoses, they should not collapse on themselves. Hope this helps
 
yea it will give a little black smoke when its thrashed. Its been happening for a few months now so its hard to remember exactly when it started but i would have said it wasn't that sudden, more of a gradual thing. One of the hoses that comes off the rocker-cover is split (if your looking from the front, its the closest one too you on the left hand side), i thought it was such a small thing it couldn't cause all that smoke??
 
Grey smoke on the overrun means worn bores as it will suck air from the sump into the combustion chambers. If you could smell the oil it would help. White diesel smoke smells like diesel, and grey/white oil smoke is quite nauseating. Low compressions will cause white (unburnt diesel) smoke on startup. If your compressions are low, the fuel will ignite just a bit later, giving the same symptoms as retarded injection.

If you are a tooth out in either direction on the crank pulley the engine will not start. If you are a tooth out on the camshaft pulley the engine will run without smoke, but not as well as it should.

Take the oil filler cap off when the engine is running and see what sort of blow-by you are getting, especially when you rev the engine. As a rule of thumb, if the pressure is enough to blow the cap off you are in trouble. Having said that we had a pretty worn engine that would suck rather than blow when the engine was revved up. Strange.

The hoses from the rocker cover don't matter, and if your turbo is stuffed you will get grey/blue oil smoke at all times, not white diesel smoke.
 
Thanks for the help Jim! so that rules out the timing problem then? the smoke is fairly nauseating but also smells very fuely!

I took the head off last night because i was instructed to by a mechanic friend. wether this actually helps or not i have no idea but i will be very annoyed if it doesn't reveal any problems. I accidently forgot to drain the coolant so the cylinders were filled with water when i lifted the head off:eek: but i blow dryed them afterwards. Now that its off, what should be inspected?? thanks for the help
 
Well, check the bores. With a bit of luck you should still be able to see the cross-hatching of the original honing. You should not have too great of a ridge at the top where the top ring stops. There should not be vertical ridges down the bores which would show broken rings. The tops of the pistons should not show any signs that the valves have hit them. Also the protrusion in the centre of the piston should not show that the injector has hit there. (this happens when the head has been skimmed). I would have the head 'done' by a decent engineering shop. The chances are you have worn valve guides, valve guide seals and valves. If your bores are fine you can get by with having the head fixed. If not, you can get by without a rebore by honing the bores and changing the rings, I did that at 100k and am now happily at 150k. (miles). Post pictures if you want an opinion from all of us :)
 
Hello again. Well ive replaced all the valve seals, new head gasket etc.... i filled each cylinder with diesel to see if it would leak past the rings, it did a bit but nothing too dramatic. The valves are in ok condition and the bores seem to be free from vertical ridges. One thing i did notice is that the inlet manifold was very very oily, so i removed the rubber hose from the intercooler to the manifold and when i revved heavily the oil was running up the hose and would also backfire out of the hose aswell?? :confused: could this be a turbo problem?? im young and ignorant please help :D
 
You know what they say about checking the simple/cheap/easy things first? The oil in the turbo hose can only be one of two things: either the engine is breathing very heavily into the cylclonic breather (on the tappet cover) and the oil is going into the intake upstream of the turbo, or the turbo bearings themselves have gone allowing oil into the intake manifold. Disconnect the breather and run it again. If the oil carries on it is your turbo. If the oil is getting into the intake via the breather your bores are worn out (or your valves and guides are worn out, and/or the valve stem seals have gone, but you have checked/replaced them).

You can also disconnect both air pipes from the turbo and run the engine, not too fast to avoid overspeeding the turbo under no load. If oil comes out of the outlet of the turbo then your turbo is stuffed. Ignore a tiny amount of oil, they all do that to some extent, you are looking for quite a bit of oil.
 
thanks for the reply jim. Well i removed the hoses from the turbo and there was only a little oil around the hose when i removed it and none came out when i revved it. the cyclonic breather is the sort of braided hose that goes back into the main air intake hose just before the turbo i presume??? I removed that hose anyway and it didnt seem to be too oily but further up the hose was very oily, theres a kink in the hose so thats probably stopping the oil coming right to the end. the landy only smokes huge amounts when its been sitting for a while, do you think that the oil could be seeping past this kink and building up somewhere over time? once the smoke has cleared its normally ok most of the day. any help is appreciated?
 
The cyclonic breather is the thingy that is bolted to the side of the tappet cover. In theory oil from there will go back to the sump and the air will go into the inlet pipe just before the turbo. You seem to be investigating all parts of the intake system so should find the reason for your smoking soon. Maybe you should remove and clean everything in order to see where the oil is coming from.
 
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