Grinding noise

lycanthrope

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1999 C200
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.
 
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lycanthrope

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1999 C200
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Loose heat shield?
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?
 

LostKiwi

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'93 500SL-32, '01 W210 Estate E240 (RIP), 02 R230 SL500, 04 Smart Roadster Coupe, 11 R350CDi
Loose sparkplugs normally chuff before eventually departing at high speed.
 

LostKiwi

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

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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.

Thanks for your answers gents, how big a job is it?
 

LostKiwi

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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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lycanthrope

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And does it need doing or is it OK to leave it and just put up with the noise?
 

LostKiwi

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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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lycanthrope

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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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