Merc Sprinter 312D smoking problem, help!
Discussion
Hi all, thanks for reading, really stuck with this one.
We've had this '98 312D from new. It's got 250k miles on it and up until now has been relatively trouble free.
It suddenly started smoking really badly last week. Without warning, just started immediately. The smoke is white oil smoke. When I say badly, I used 2 litres of oil driving the 4 miles home after it happened. It doesn't seem to have lost power and has no trouble revving. I have no lights on on the dash.
Turbo of course. I took the turbo off and it had a bit of oil in it but no real play. I put it back on and went to a local garage to plug the van in to the diagnostic machine. They advised turbo as they couldn't find any fault. I explained about the lack of play and was told it had to be the turbo as what else could put that amount of oil into the exhaust?
Fair enough. I bought a new turbo. I put it on and the van is no different.
Clues. (With new turbo on).
I can take the boost pipe off before the inlet plenum (so the van is essentially N/A) and hold the revs at 2.5k for over a minute without any sign of the smoke lessening.
I can take the pipe from the airfilter off the front of the turbo (so it's drawing air direct from atmosphere) and rev for over a minute with no sign of the smoke lessening.
There is only an acceptable (IMO) amount of oil vapour coming from the breather from the rocker cover.
When I put the old turbo back on to go to diagnostics I did so without a gasket as it was damaged. During the drive there and back and a fair bit of revving for test purposes oil had wept out through the exhaust manifold / turbo joint.
The amount of smoke is incredible, I have never seen anything like it. James Bond's Aston had nothing on this!
It has recently been using a little water. I guess 1/2 a litre every 1000 miles.
I just don't know what to do. I have googled for hours and seen a couple of threads where people have had similar problems but without conclusion.
If anyone has any thoughts I'd love to hear them.
Thanks, JJ.
We've had this '98 312D from new. It's got 250k miles on it and up until now has been relatively trouble free.
It suddenly started smoking really badly last week. Without warning, just started immediately. The smoke is white oil smoke. When I say badly, I used 2 litres of oil driving the 4 miles home after it happened. It doesn't seem to have lost power and has no trouble revving. I have no lights on on the dash.
Turbo of course. I took the turbo off and it had a bit of oil in it but no real play. I put it back on and went to a local garage to plug the van in to the diagnostic machine. They advised turbo as they couldn't find any fault. I explained about the lack of play and was told it had to be the turbo as what else could put that amount of oil into the exhaust?
Fair enough. I bought a new turbo. I put it on and the van is no different.
Clues. (With new turbo on).
I can take the boost pipe off before the inlet plenum (so the van is essentially N/A) and hold the revs at 2.5k for over a minute without any sign of the smoke lessening.
I can take the pipe from the airfilter off the front of the turbo (so it's drawing air direct from atmosphere) and rev for over a minute with no sign of the smoke lessening.
There is only an acceptable (IMO) amount of oil vapour coming from the breather from the rocker cover.
When I put the old turbo back on to go to diagnostics I did so without a gasket as it was damaged. During the drive there and back and a fair bit of revving for test purposes oil had wept out through the exhaust manifold / turbo joint.
The amount of smoke is incredible, I have never seen anything like it. James Bond's Aston had nothing on this!
It has recently been using a little water. I guess 1/2 a litre every 1000 miles.
I just don't know what to do. I have googled for hours and seen a couple of threads where people have had similar problems but without conclusion.
If anyone has any thoughts I'd love to hear them.
Thanks, JJ.
one eyed mick]You have probably filled the silencer and pdf full of oil it will burn away [long time said:
can you drop the pdf and silencer off and run it for afew secs if theres no smoke you have found your answer . I had this years ago on a morris deisel van ,we changed the exhuast ,job done , similar on my seven ,blew a piston 4 pints of oil used in short milage ,stripped and repacked silencer again job done
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