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Help expensive problem with Mercedes ML..

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by chaso, Nov 2, 2012.

  1. chaso

    chaso New Member

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    Your Mercedes:
    ml cdI 270 2002
    Can anyone advise me please I have a Mercedes ML 270 CDI 2002 plate. Last week when I started the engine I noticed grey smoke coming from under the bonnet, when I lifted the bonnet I noted the oil dipstick had been forced out by the smoke causing oil to spurt out. I turned the engine off and opened the oil cap and the same smoke was coming out of there. Engine was running ok at this time. I drove a short distance home (which in hind sight I should not have done) and when I got home oil was spurting out more and now all over the engine.
    I took it to my local garage and they have told me they suspect the pistons is the cause but they can not get to examine these bacause 3 of the 5 fuel injectors are seized with black tar like substance which I understand to be a common problem in diesel Mercedes. They have advised me to scrap the car or get a new engine as they say despite soaking the injectors they are not freeing up and I will therefore have costly bill to free them before they can even begin to examine the engine. Then if as they suspect the pistons have gone I will need a new engine anyway.
    Does this add up? Could the seized injectors not be the only cause of this problem or is this likely to be an incidental finding? I have been quoted 2-3k to get everything done and as the car is only worth 3k I am thinking I need to scrap which would be a shame as it has all high spec interior and only just over 100k miles on the clock. I have over the last year spent a fortune on this car with new fuel pipes, diesal pump, full break system. Gutted.
     
  2. Some guy on the internet

    Some guy on the internet Senior Member

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  3. panason1c

    panason1c Senior Member

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    Your Mercedes:
    Mercedes ML270CDI, VW Polo 1.9tdi, BMW K1200RS
    The cylinders can also be inspected by inserting a bore scope via the glowplug holes.

    Sounds like a piston failure though, possibly due to one of the inlet manifold swirl flaps being ingested?
     
    Last edited: Nov 2, 2012
  4. oigle

    oigle Senior Member

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    Your Mercedes:
    Currently 2003 ML270. 2012 Nissan Maxima 250SL.
    How could it be piston failure if it was "running OK at this time"? Any holed piston would cause the motor to run very badly.
     
  5. OP
    chaso

    chaso New Member

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    Your Mercedes:
    ml cdI 270 2002
    I live in Leek Staffordshire
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    I wonder if diesel has been leaking into the sump and its all over filled, it does need some one who knows these engines
     
  7. panason1c

    panason1c Senior Member

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    Obviously, it depends on the DEGREE of piston failure........slight damage to the piston, or rings, can still give reasonable compression (hence engine running ok) whilst allowing sufficient blowby to cause the OP's symptoms. :rolleyes:
     
    Last edited: Nov 3, 2012
  8. taxii

    taxii Senior Member

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    Your Mercedes:
    c200, 1996, 2000
    How much is a recon engine for one of these? It could be cheaper to just change the lump in the time it takes to find and rectify the fault.
     
  9. panason1c

    panason1c Senior Member

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    Your Mercedes:
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    Usually loads of these engines on ebay at reasonable prices.
     
  10. taxii

    taxii Senior Member

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    That's what I thought. It could be cheaper in the long run to just bite the bullet and get the lump out and another one in and save on the labour costs.
     
  11. mikestrivens

    mikestrivens Senior Member

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  12. Frontstep

    Frontstep Senior Member

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    This seems like some conclusions are being made without the facts.
    Some one who knows what they are doing needs a look before any determinations are made.
     
  13. oigle

    oigle Senior Member

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    Being a diesel and very reliant on good compression to fire the mix, I would have thought any damage that was enough to cause REALLY SERIOUS blowby, as maybe is the case here, would have lowered the comp ratio enough to prevent that cylinder firing.
    I wouldn't be making any assumptions re piston failure until properly examined.
     
  14. Some guy on the internet

    Some guy on the internet Senior Member

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    Agreed. That's why I asked the OP where he was based.

    Anybody know a good MB indy in his area?
     
  15. mikestrivens

    mikestrivens Senior Member

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  16. Uncle Benz

    Uncle Benz Senior Member

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    I'd suggest a good look at the engine breather unit on the top of the cam cover before condemning the engine.
     
  17. Some guy on the internet

    Some guy on the internet Senior Member

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    I think Crewe are more in the business of selling engines than being true independent MB specialists who will diagnose a fault. Quite possibly any fault they do diagnose will be cured by selling a replacement engine!

    It hasn't even been determined what's wrong with this engine, let alone whether the OP needs a new or replacement one.
     
    Last edited: Nov 4, 2012
  18. taxii

    taxii Senior Member

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    Not trying to jump to conclusions but if merc hourly rates are anything like bmw then it might be cheaper in the long run to just replace the lump rather than pay for a fact finding on the present lump. I once paid 185 for a wiper relay to be replaced on a beemer 5 series and only 15 of it was to actually buy and fit the relay. the rest was to find out it was the relay.
     
  19. taxii

    taxii Senior Member

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    This is another reason why fix it days and finding out where nearest members are to each other. If one of our more knowlegeable types was near the op then a quick wander round for a cuppa and a gander so to speak might well shed some more light on the problem than the op is able to get across in just posts. I for one take being a member of these types of clubs and forums pretty seriously and if anyone near Knowle in Bristol who was a member needed a hand and I was able to help I would already be on my way with tool kit and trolly in the boot. It's what I feel the idea of these clubs is meant to be about and I'm pretty sure most if not all members of this club feel the same. :)
     
  20. OP
    chaso

    chaso New Member

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    ml cdI 270 2002
    Thank you to everyone for your advice and discussions. I have copied and pasted them onto A4 and intend discussing with my local garage today. I am keen to get a Merc specialist to comment so thank you for suggesting this. I will let you know the outcome.
     

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