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Turbo Seal Failure - Common Problem ? Warranty ?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Rodger, Jan 6, 2013.

  1. Rodger

    Rodger Guest

    Hi Everyone, new to the forum so briefly let me introduce myself. I'm 51, live in N.Z. and bought a S320 Cdi in 2007 new.

    Early on I had a lot of problems with fuel getting into the oil and the oil level rising due to a partially blocked DPF and at several stages the diesel ingress was so bad I believe it got to approximtaly a 20 % fuel oil ratio in the crankcase and the engine was over-full with oil on a reasonably frequent basis in its first two years of its life.

    Back in 2007 this problem didn't seem to be as well known in N.Z. as it is now and eventually we came to a settlement with M Benz that invloved the removal of the DPF, deemed unsuitable for constant short journey city trips and what i thought was an unconditional and full engine and turbo warranty for a considerable distance, (not sure if I should disclose the distance so better not) and its irrespective of time owned.

    No problems for the last 3 1/2 years but the other day the car refused to accept more than about 25% throttle without going into a fairly abrupt shut down, which seemed like a fuel delivery starvation issue, (subsequently diagnosed as a turbo seal failure). Not sure if its the inlet seal or outlet but there's oil coming out of the seal failure ?

    This raises a few questions.
    1. Is seal failure on the diesel turbo a common problem ? Car is 5 1/2 years old done 44,000 km's = 27,000 miles.
    2. Is the turbo seal exposed on a constant basis to the engine oil ? Seems it must be if there's oil leaking out of there now that the seal has failed ?
    3. Given that we are supposed to have an extended guarantee on this engine due to its signifcant early fuel / oil ingress problems and this seal would have been exposed to excess pressure from an over-full crankcase and contaminated oil with diesel fuel to a ratio of 20%, surely they must cover this with the warranty ? (Service manager didn't sound hopeful in his e.mail on Friday just gone).

    Any assistance and similar experiences greatly appreciated. Sorry for the long first post. Other than these issues the gearbox hasn't exactly been first rate by any stretch of the imagination although the recent gearbox and fluid change has improved the smootheness considerably. Very good car apart from issues noted above.
     
  2. st4

    st4 Banned

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    Seal failure is common, oil leaks from the turbo onto the motor than controls the swirl flaps. They close rendering the car very reduced power. Very common faulyt.
     
  3. oigle

    oigle Senior Member

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    Not too sure what you mean here. Where is the oil leaking from? Remember that the PCV puts a fair bit of oil vapour into the inlet system and any loose clamps or split hoses etc on the boost side of the turbo will leak oil from this source. Swirl flap spindles can also leak when worn and often drip oil onto parts that can cause limp mode to happen.
     
  4. malcolm210

    malcolm210 Senior Member

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    Read the following thread which discusses Turbo and IPS motor problems. It will help you understand the induction system and associated faults.

    http://forums.mercedesclub.org.uk/showthread.php?t=99549&highlight=ips&page=4

    Many owners with the 642 engine have the turbo seals checked/replaced at each service to avoid oil loss from the turbo seal induction side finding its way onto the Inlet Port Shut-off Motor.
     
    Last edited: Jan 6, 2013
  5. OP
    Rodger

    Rodger Guest

    Its just as ST4 has described it. Oil is leaking out the front end of the turbo onto the motor. Dealer says fine to drive as it is until its fixed. I'm a bit sceptical on that one so its parked up in the garage at present. I'll hopefully find out tomorrow if they'll cover it under the extended warranty, (not holding my breath).

    If they're replacing the outlet seal and telling me it'll take circa 6 hours labour, (seems like a lot), might i just as well replace the inlet turbo seal at the same time ?
     
  6. oigle

    oigle Senior Member

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    Ok. Understood. My 270 motor has different issues but the oil mentioned comes from the same source - PCV. As I said, any bad seal, loose clamp or split hose on the pressure side of the turbo will spit out oil from this source. The seal on the inlet side is not subject to pressure and thus much less chance of leaking.
    I don't know the plumbing on your motor but sure seems a lot of time to replace a seal.
     
  7. BAZZER1

    BAZZER1 Senior Member

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    As Oigle said, seems a lot of labour time to relace the Seal, I would get another quote from a Specialist Indie.
    Welcome to the Forum
    BAZZER1
     
  8. BAZZER1

    BAZZER1 Senior Member

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    Sorry Roger, last post should have read Replace the Seal and not Relace, Got a bit of Finger Trouble with the Keyboard today.
    Best Regards
    BAZZER1
     
  9. OP
    Rodger

    Rodger Guest

    Thanks Gents and thanks for the welcome BAZZER1. There's not enough of these S 320 Cdi's in New Zealand to get useful feedback, but I know they're very popular in the U.K. so that's why I joined this forum.

    It seems like a fair few people have trouble with their Mercedes-benz, I guess the more complicated a machine is the more there is to go wrong with it.

    P.S. Just had the call that M Benz are doing this work under the terms of the extended warranty so that's a relief as I spent just on $3,000 N.Z. dollars on new tyres and full service and gearbox service just before Christmas and didn't need another big bill straight after Christmas. Very happy :)
     
    Last edited by a moderator: Jan 7, 2013
  10. st4

    st4 Banned

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    It is ok to drive it. It will go upto 2k rpm and 60mph (100kmph) to issue at all. I wouldn't drive it far and it will snatch gears but its ok.

    Common fault, easy fix.
     
  11. oigle

    oigle Senior Member

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    Good news. Nice to have a win sometimes.
     
  12. OP
    Rodger

    Rodger Guest

    All sorted today under the terms of the extended warranty, loan car provided even though all their regular serevice loan cars had already been booked, my car was returned late this afternoon immaculatly groomed as it always is after every other normal service, super friendly service and a complimentary M Benz TaylorMade Golf cap for good measure along with good humour, "guaranteed to improve your golf swing Rodge", don't know about that :)

    Top result, doesn't get any better than that... unless of course their pretty young receptionist wanted to take me to lunch... oh well, I suppose a middle aged chap like me can always dream :)
     
    Last edited by a moderator: Jan 9, 2013

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