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Grinding noise

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by lycanthrope, May 13, 2019.

  1. lycanthrope

    lycanthrope Member

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    Hi,
    My w202 c200 has a grinding noise at the beginning of the rev range then it goes as the revs go a bit higher, it sounds like it's coming from the top of the engine I've had a good listen and it doesn't sound like it's coming from any of the pulleys.
    Any ideas please?
    Thanks.
     
  2. LostKiwi

    LostKiwi Senior Member

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    Loose heat shield?
     
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  3. OP
    lycanthrope

    lycanthrope Member

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    Yeah, I was hoping for something like that. I didn't have time to look after work so I'll take a look tomorrow, do you think a loose spark plug could make that noise?
     
  4. LostKiwi

    LostKiwi Senior Member

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    Loose sparkplugs normally chuff before eventually departing at high speed.
     
  5. OP
    lycanthrope

    lycanthrope Member

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    It's definitely not a chuff, I'll take a look after work, thanks!
     
  6. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    The camshaft timing variators and magnets are very common for noise on the 111 engine.
     
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  7. LostKiwi

    LostKiwi Senior Member

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    Good call. There's an internal spring that breaks in the variator. Usual story to fix... Several hours to labour to fit a 50p part.
    My old C180 had that problem. It can be left from what I recall.
     
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  8. OP
    lycanthrope

    lycanthrope Member

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    Thanks for your answers gents, how big a job is it?
     
  9. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Quite big. 4-5 hours work for an experienced hand.
     
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  10. LostKiwi

    LostKiwi Senior Member

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    From memory if you blip the throttle it rattles as it climbs past 1500-2000 rpm and again as it falls back through 1500-2000 rpm
     
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  11. OP
    lycanthrope

    lycanthrope Member

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    And does it need doing or is it OK to leave it and just put up with the noise?
     
  12. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    I have seen many run to many miles with this fault. But i wouldn't want to say that it would not cause a problem.
     
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  13. LostKiwi

    LostKiwi Senior Member

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    My old C180 had the same issue and although it ran fine it would occasionally pop an EML up for cam position.
    I ran it 12 months just resetting when required. Bought the spring but sold the car before fitting it.
     
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  14. OP
    lycanthrope

    lycanthrope Member

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    Thanks so much for your help guys, looks like I'm in for a little bit of work here
     

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