Mercedes 208D auto-trail diesel leak

Discussion in 'Tech/Mech General' started by Dan The motorhome man, Nov 10, 2015.

  1. Dan The motorhome man

    Dan The motorhome man

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    Afternoon folks,
    I've noticed i have a diesel leak and after hunting around underneath checking the fuel lines and wiping the crud off i found nothing. I took out the centre console in the cab to access the engine and it seem that diesel is wicking through the inlet manifold gasket down the side of the engine, its a very slow leak but has reduced my MPG to 10.
    Im not 100% sure if it is the inlet manifold gasket but thats where if seems to be.
    I've booked into a motorhome stop in spain and im hoping to (if i can) get parts delivered and repair my self.
    If pictures or a video would help im more than happy to upload.

    what are your thoughts?

    Many Thanks
    Dan
     
  2. TheBig1

    TheBig1 Funster Life Member

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  3. Dan The motorhome man

    Dan The motorhome man

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    Cheers for that, i just downloaded it on my phone through the scribd app and was wondering how to get it on the PC
     
  4. TheBig1

    TheBig1 Funster Life Member

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    download again direct to the pc or transfer the file by wifi or bluetooth from the phone
     
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  5. Dan The motorhome man

    Dan The motorhome man

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    A pic from inside the cab. Has anyone seen this problem before from a gasket failure? or is it possible the diesel is coming from else where? its wet all alone the gasket line . 20151110_172625.jpg
     
  6. jonandshell

    jonandshell Funster

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    Are you sure it isn't that perished injector leak off hose?
    Inlet manifolds don't leak diesel!
     
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  7. Dan The motorhome man

    Dan The motorhome man

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    Thank you, im not familiar with diesel engines at all. But will assume its the braided hose coming from the injector. i will keep scouring the net for info but again thank you for pointing me in a direction!
     
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  8. gus-lopez

    gus-lopez Funster

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    Yes as said that braided hose is leak off pipe & will loop from one injector to the next & then either return to tank , filter or even pump. The first injector will have a short piece of hose with a blank plug in it same as your photo. looking at that I'd think that the best way is to start the engine & see whether it is spraying out from somewhere. Be it the leak off pipe ,loose injector nut, even an injector pipe with a perforation in it.
    When checking with it runinng DON'T use your hand/fingers as the high pressure can easily puncture skin . Use a piece of paper ,card , rag ,etc.

    It is highly unlikely to be a fault with the inlet manifold gasket as basically it is only air coming in through the inlet manifold. The diesel would only be leaking from the injectors when it was running ,unless an injector nut was loose.
    That leak off pipe you can obtain from any commercial repair garage here. Cheapest place normally . I pay 6€/metre.
    Hope this helps.
    P,S, Whereabouts are you in Spain.
     
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  9. mitzimad

    mitzimad Funster

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    PROBABLY THE EASIEST WAY TO FIND IT IS GET THE ENGINE STEAM CLEANED FIRST
     
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  10. Dan The motorhome man

    Dan The motorhome man

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    sounds like a positive outcome! and thank you for the advice, i'd say this forum membership had already paid for itself.
    im currently just outside Almayate, véléz-Málaga. On a great little motorhome site.
     
  11. Dan The motorhome man

    Dan The motorhome man

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    I know, its filthy! but im on a money saving adventure :) i shall definitely give it some elbow grease though
     
  12. gus-lopez

    gus-lopez Funster

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    Another place that you can always obtain spares like leak off pipe , water & oil pipe & elbows ,etc is any tractor dealers. They are normally dotted about all over & keep an aladdins cave of parts that can be modified to suit older vehicles.
     
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  13. Peter A Forbes

    Peter A Forbes Funster

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    Volkswagen and many others use that same braided flexible leak-off pipe.

    If that is some kind of screw jammed in the final short piece then diesel will run up the threads and leak out.

    It is all push-fit stuff so buy a metre or so and renew it all, it's an hours job, nothing more.

    The other thing to remember is that on a good injector there isn't much spill at all, it's only when the nozzle gets worn that it gets significant leak-off flow.

    A bit of leak-off shouldn't affect your MPG hardly at all, so look for a bad injector pipe union somewhere that is leaking when running.

    Peter
     
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  14. Jaws

    Jaws Funster Life Member

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    A leaky manifold gasket would cause a pretty nasty misfire !
     
  15. tonyidle

    tonyidle Funster

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    Don't think bling was the point. It's easier to find a leak when the area isn't covered in whatever is leaking :D.
     
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  16. Dan The motorhome man

    Dan The motorhome man

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    Ran the engine this morning and I could see the diesel almost pulsing out of the braiding of the hoses, as I was removing them almost all of them snapped in my hand, extremely brittle.
    Had a trundle into town and managed to get a meters worth of hose for 3 euro. Once fitted, I ran the engine for 10min and it seems to have fixed it. After reading the comments on here, I now believe there may be an underlying problem, I have noticed a lack in power but put it down to the leak. so could injectors be next on the agenda?

    Again thank you everyone for your help.
    20151111_181556[1].jpg
     
  17. Peter A Forbes

    Peter A Forbes Funster

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    The leak-off fluid wouldn't affect your performance unless it was introducing combustion gases into the fuel on the inlet to the injection pump.

    I'd suggest getting the injectors tested though, new nozzles are about 25-30 euros each plus fitting and testing.

    The better fuel consumption would pay for the work pretty quickly, assuming that worn nozzles are the issue.

    If you PM me your VIN number I'll check on the Mercedes and Bosch part numbers tomorrow.

    Peter
     
  18. hiho

    hiho Read Only Funster

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    Thank you TheBig1 for the manual. I've been looking for one for along time.Cheers
     
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  19. funflair

    funflair Funster Life Member

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    You should know if you have an injector off it will knock like a bag of hammers when you start it from cold but settle down when hot.

    If the pipe you have on the injector leak off is not the proper stuff just keep an eye on it when it warms up and make sure it's up to the job.

    Martin
     
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