|
i borrowed my dads 406 1.9td for work on the way home it started to slow down and not pick up, next min theres smoke pouring out everywhere, i pulled over took the keys out but it was still running smoke everywhere, i popped the bonnet it wasnt on fire ripped the battery wires off still running tried loads of things to stop it but it wouldnt by this time you couldnt see the car for smoke it was running at 3-4k revs on its own, then i thought i will stall it which i did. we started it this morning its running at normal speed, turning off but as soon as its started smoke comes out the exhaust and from the back of the engine really bad. any ideas what could have gone. cheers
|
I think diesels have the ability to suck engine oil in through the air filter route and chug away by themselves for a while. I don't know much about it, but it would explain the running on after the keys and battery were disconnected (diesels only need fuel and air to run, no spark so wouldn't care about the keys or battery being removed. The key stops em by cutting off the fuel...)
I would guess oil has escaped into the cylinders via some route and would guess thats not a good thing.
Sorry, not a very useful reply... I'm sure someone more mechy will be along in a mo...
|
Yep, a diesel can run on its own sump oil - and you can't stop it except stall it or block the air intake. Usually they run away and go bang big style.
Some possibilities - the crankcase breather is partially blocked and is pushing oil into the air intake; the engine oil is overfilled allowing it to be thrown around into the breather system; an oil control piston ring has failed allowing oil into the cylinder; the inlet side turbo oil seal has failed (given that it appeared to be running on all cylinders, and did not run to distruction I think this is the most likely cause here - assuming the oil is (was!) not overfilled).
--
RichardW
Is it illogical? It must be Citroen....
|
You were lucky... A runaway diesel bangernomics.tripod.com/diesel.htm
|
thanks for the help thats great. what would you say is the best couse of action for us to do next to rectify the problem. as soon as the engine is started from been stone cold its chucking out blue smoke from tickover, and the smoke is coming out from the exhaust and behind the eninge.
once again thanks for the help.
|
|
Yes, I reckon the other posters are *bang* on...also worthy of note is that you shouldn't use intake cleaners such as Carb cleaner, or use Easy Start, as the diesel engine has no throttle, instead, it's speed being controlled by the fuel quantity, so when you spray the solvent in it can run away to high rpms.
|
|
One of the causes can be the hose between the air cleaner and the inlet manifold (or intercooler/turbo)going soft and putting depression directly on the crankcase;check all your hoses.
|
thanks for all the help. i think the first thing i will check is the turbo oil seals, then will just go from there.
cheers
|
Try this... disconnect the turbo outlet hose and restart the engine. If the turbo is the problem, the blue smoke should clear after a few seconds, and a cloth held close to the disconnected pipe should get covered in oil. If the smoke persists, and the cloth is clean then you have another problem. It might be the head gasket - they go on these engines around the oil gallery behind the timing belt end - this usually just leaks oil down the back of the engine, but if yours has let go big time it could be leaking oil / smoke out of the back of the engine, as well as letting oil into No 4 cylinder causing the fog behind you.
My money is still on the turbo though....
--
RichardW
Is it illogical? It must be Citroen....
|
Richard's advice sounds good, and I'd try it first. This happened to a 1979 Golf diesel I had once. After much panic and puzzling (I do sympathise!!), I found that VW actually sold a kit to overcome the problem.
Worn piston rings, bores, valve guides etc. were allowing the crancase to become pressured. Oil accumulated on top of the head and was sucked in and burned. Remedy: £10 worth of rubber hose and adapter piece running between the cam cover and the bottom of the block, thus equalising the pressure. It never did it again, and a similar improvisation might work for you if nothing else does!
|
|
hi, finally got the car in the garage today. i took the intercooler off and like you said it was full of oil approx 2 pints. where the exhorst fasterns to the turbo there is oil seepage around the joint. do you think it must be the seals in the turbo. shall remove the turbo tomorrow, do you know if the seals can be changed by a specialist. thanks
|
bttt = bump / back to the top?
I think the turbo is definitely stuffed - did you try running the engine with the pipework off?
There are several companies that refurb turbos - look in the back of car mechanics magazine for instance, or just do a web search. You will probably be able to get an exchange unit without sawing off too many arms. Good luck getting it out - there's not much room down the back of there!
--
RichardW
Is it illogical? It must be Citroen....
|
|
the turbo is off and the turbine is loose and all mangled up. looks like its a new turbo job
|
