E320 CDI Turbo Failure at 37000 miles???

[Vips]

i find it realy hard to grasp that at 37000 mile and 57000 mile there is a problem with the turbo they should last at least 120 k

tradiing standards sir suits you .

mercedes absolute balls
:bannana:

Don't let glojo hear you say this

 

[glojo]

Don't let glojo hear you say this

Hear what??

John the useless

 

[silverarrow]

typical mbz build quality ????
buy a lexus

 

[paulmb]

something about the w211 e class.....my mum has a e270 cdi and its done 32000 miles.....she has just had a third turbo replaced on it....the warranty runs out in september.....she said she might sell it and get a BMW 530 diesel sport...........i don't blame her............3 turbos?!?!?!?!?!?!?!?

thats just not right.............

 

[Vlad]

Its not just Merc's that have been hit with this problem.......Renault's, especially Laguna's eat turbo's for breakfast.

So far my friend who has a 2.2DCi Laguna (150bhp) has had a turbo replaced at 20,000 and has also needed a new ECU, new Injectors and very recently a faulty injector was diagnosed. When the garage tried to get it out they wrecked the head, so a new cylinder head was needed. Garage denied that the wrecked head was their problem....yeah right....Renault reluctantly paid £1000 goodwill towards the head and the balance of £2500 was covered by warranty.......car has just done 60,000 miles and safe to say its going to be sold.

Renaults.......rubbish.....especially the ones with the DCi Turbo engines.

 

[Satch]

Turbo failures are a common fault on CDi engined cars.
The fault is the wastegate sticking open so losing boost which is then detected via the boost sensor, thus throwing the ECU into "limp home" with no boost.
The switch off resets the system so all is good for a while.

The wastegate control actuator applies vacuum to close the wastegate. If the system fails or there is a vacuum loss the wastegate will open causing no boost as a safeguard.

Anyway, good result Brian.

So when people talk about "Turbo failure", is the common experience actually a failure of a control mechanism associated with the turbocharger rather than the unit itself?

Is it possible or indeed an economic proposition to change the faulty bit or do we end up in real life with an entire new/remanufactured unit just because it is the easiest option?

 

[jgevers]

So when people talk about "Turbo failure", is the common experience actually a failure of a control mechanism associated with the turbocharger rather than the unit itself?

Is it possible or indeed an economic proposition to change the faulty bit or do we end up in real life with an entire new/remanufactured unit just because it is the easiest option?

Most of the failures I have seen on the MB, BMW, VAG and Renault diesels are not the main core that fails but the 'variable vane' part that gets stuck.
Sometimes the lever can be unstuck with some gentle persuasion but quite often the vanes are stuck in 1 position that causes either overboost at higher revs or low power at low revs.

Cheers

 

[Vlad]

Is this because the vains getting clogged up with Carbon due to the emmission controls on the engine?

 

[silverarrow]

yep bad design
how many truck turbos fail????

 

[jgevers]

Is this because the vains getting clogged up with Carbon due to the emmission controls on the engine?

It looks like it. I did check my ML that had a new turbo about 20K miles ago. Still pretty clean, running with EGR disabled. My Golf TDi with 125K miles had a proper inlet and turbo clean about 50K miles ago. At the same time I programmed the EGR shut and was still quite clean at 118K miles.

So, I guess it is EGR related. Mind you, exhaust back pressure could have an influence as well. I did remove the cats of both cars as well and the pressure in the downpipe on both dropped considerably under high load/boost.



Cheers

 

[Vlad]

I read somewhere that the Renault problem is also EGR related.......I have heard that on Renaults it can have the effect of over boosting the engine, which then results in the engine oil being forced into the combustion chambers and the engine feeding off its own engine oil until it goes "Boom"