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C250 CDI timing chain noise?

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by Paul297, Oct 17, 2020 at 1:22 PM.

  1. Paul297

    Paul297 Member

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    Joined:
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    Your Mercedes:
    C250 Coupe
    Hello everyone,

    I've noticed since I bought my C Class a few months ago, the engine makes a strange noise than can be heard in the cabin. On start up, it's louder for a few seconds and then quietens down. Sometimes it's also accompanied by a grinding noise that last a couple of seconds.

    This is only on cold starts and it doesn't always make the grinding noise.

    I suspected the timing chain. The car has done 66k and has a full Mercedes service history.

    I managed to get a video toward the back of the engine. You can hear the chain, but I don't know if it is a normal noise or not... what do you think?



    I've got a 2 year warranty on the car. But I've got a feeling if I went back and said I think the chain and tensioner are going, they'd try and get out of changing it and out it down to wear and tear. So I'm on an information gathering mission.

    What do you think?

    Thanks

    Paul
     
  2. ajlsl600

    ajlsl600 Senior Member

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    Your Mercedes:
    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    U have the warranty get back to them see how that goes. Read all the small print.
    Failing that.me, I would try changing the tensioner,oil and filter. Cut open the old filter take a look for tiny metal bits,unlikely but check anyway.if that shuts it up disable stop start and plod on ,if not make a plan to change chain as well ,with look at any sprockets u can see. If still making a row after tensioner,filter oil ,it WONT ge getting any better and maybe a LOT worse.
     
  3. Dean Fletcher

    Dean Fletcher Senior Member

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    Your Mercedes:
    Mercedes E250 coupe
    Sounds normal to me another noisy diesel
     
  4. Dean Fletcher

    Dean Fletcher Senior Member

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    Your Mercedes:
    Mercedes E250 coupe
  5. OP
    Paul297

    Paul297 Member

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    Your Mercedes:
    C250 Coupe
    To be fair, the video I posted wasn't the best. Seem to hear it more in the cabin.

    Is it normal for the engine to sound louder/rough for a few seconds on a cold start?
     
  6. Dean Fletcher

    Dean Fletcher Senior Member

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    Your Mercedes:
    Mercedes E250 coupe
    Yeah mine does especially if its stood for a while.
     
    matthew k likes this.
  7. sonic

    sonic Senior Member

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    Your Mercedes:
    E350CDI, SLC250d, FJR 1300
    Take it in to MB get their opinion, its under warranty. If they say its normal & you have a problem later, its good evidence for a claim. Plus it puts your mind at rest.
     
  8. ajlsl600

    ajlsl600 Senior Member

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    Joined:
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    Location:
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    Your Mercedes:
    clk3202001,sl6002003 with everything regrettably sold ,A class 170cdi auto. NG/TF1800 ML250
    When mine stood .I dont let it catch the first few times ,ensures oil getting around.one hopes ?
     

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