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Discussion Starter · #1 · (Edited)
:confused:got a 1.9 dci megane 120hp :confused:

turbo bearing callapsed , i then bought a new turbo of ebay and it lasted three hours and then its started running on its own oil, and then i replaced it again and after another day the same happened again. i have just bought a new one again, any ideas why it keeps doing this, what the problem is ?


nt so clever with the diesel turbos

thanks
 

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Have the oil feed and return pipes been renewed?

Is the return port to the engine block clear?

Did you check oil was being pumped via the turbo oil feed pipe before connecting?

Was the turbo promed before engine start up?

Has the inlet plumbing and intercooler been replaced or cleaned as recommended?
 

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hi

when you replace the next turbo remove the intercool and wash all the oil out of with a pressure washer and let it dry out , also clean all intake pipes in the same way as when the turbo fails it pumps oil into the intake which is why they run up and will not switch off.

Also worth removing the egr valve as they can hold oil in it and when you road test the egr open dumpping oil in to the intake.:crazy:
 

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Discussion Starter · #5 ·
all boost pipes were properly cleaned
air filter oil filter and oil was renewed each time aswell as the turbo being primed.

the maf is dameged i have noticed but there are no bits going into the intake.

also i am not sure on where the vacumm pipes should be on a deisel.

thanks for comments
 

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Hi all,

I've been reading all these posts with interest.I have a 2003 Espace 1.9dCi with 160k miles on the clock. I bought it in 2006 when it had about 120k on it. It had been used as a fleet car, shuttling between Glasgow and Gatwick so lots of motorway miles. I kept up the servicing at a Renault dealer until I moved 2 years ago. We have a Kwik Fit near us so I started using them as I get a free MOT with a service through my insurance policy.

Ever since I have owned the car, the orange light has come up on the dash and the power goes (owners manual says this light comes on due to an "electrical fault". Normally happens going up hills. Pull over, switch engine off and straight back on and it runs fine. I asked the Renault dealer to look at it many times. They said they had NEVER heard or come across a problem like it! I also took the car to various other mechanics who all said different things. I eventually gave up as I had learnt to avoid it coming on by keeping the revs high going up any inclines.

So the last 2 years I've had oil and filters changed every 12 months which is currently about 10,000 miles per year. I drive 30 miles on dual carriageways every day at at least 70.

So, starting a few weeks ago, at first I notice a puff of white smoke on cold starting. I also notice that sometimes, when pulling away nothing happens. No throttle at all. Hmmm not good. So I book it into a local mechanic to have a look. With hindsight, I should probably have stopped driving it at this point but was totally ignorant of catastrophic "incidents". I also noticed a couple of times when changing gear that the engine raced when I depressed the clutch. It was burning oil and the level was dropping so I topped it up by about 1 litre. Anyway before I made it to the garage, I was driving along the motorway and after about 60 miles I noticed a load of smoke from the exhaust. It seemed to be black smoke at that point. The power started going too. Suddenly absoloutely loads of white smoke started billowing out so I started pulling over onto the hard shoulder. The engine had already started racing whenever I depressed the clutch. I decided I would stall it but for some reason didn't. When I came to a halt the engine was racing so loud and fast I thought that if I tried to stall it from standing something would definitely break. I knew that if it didn't stop it would be the end of the engine because it was just way beyond the limits. Panicking I pressed the button a few times and then yanked the key card out, shortly after which it spluttered to a halt. The engine was racing by itself for about 30 to 40 seconds I think.

The recovery guy said it was more than likely to be a blown turbo. He seemed to know a lot about it and said it might be OK if I replaced the turbo. We checked the oil and there was about a third left. Then I found this forum, read some posts and thought I'd give it a go myself as I wouldn't be able to afford for anyone else to do it. I replaced the turbo (which had no visible damage and no play), the EGR valve, (covered in gunk but moved freely), vacuum valve (which was completely melted/burnt), new boost control solenoid and all the air/fuel/oil filters. I thoroughly cleaned all the pipes to and from the turbo and I flushed and cleaned the intercooler. I flushed out the oil feed and return pipes to the turbo. So after putting it all back together and filling it with oil (fully synth 5/40), I primed the turbo by turning the engine over a few times with the fuel pump power disconnected and then started it. It started fine but with loads of oily smoke and it was running very unevenly, almost as though one of the cylinders wasn't firing. It smoothed out when I gave it some revs but the smoke was really pouring out of the exhaust. I thought it might just be the excess oil burning off after the turbo failure. I gave it some more revs to about 3000 and then...guess what? The engine started running away again. Exactly the same. Tonnes of white smoke, engine screaming. I didn't want to risk stalling it as it was still on axle stands with the drivers side wheel off. Again I pressed the button a few times and yanked the card out and again it stopped by itself. It was running away for about 30 or 40 seconds altogether I reckon. I checked the oil level and there was still plenty. It started again straight after but again very rough and smoky but at least it started. I checked the intercooler and it was completely full of oil. About a litre of it. I noticed that even though it was just changed, the oil looked very black and dirty. Back to the drawing board then...

So I'm thinking either:

1. the replacement turbo was already blown (it came from a car written off in an accident)
2. Something else is badly wrong which led the replacement turbo to blow after 5 mins of running.
3. Something else? Too much oil? Oil getting stuck in the seperator when refilling - I've heard that this can be a problem and cause a runaway.

Any ideas much appreciated! Sorry for the long post...
 

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Mine turned out to be pressure in the crankcase which was forcing oil out of the breather tube and into the air intake of the turbo. The turbos themselves may have been perfectly OK after a clean. The pressure was being caused by blowback past the piston rings. Ended up getting a recon engine.
 
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