2010 C350 blue efficiency rattle on cold start

clarkey2311

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Hi guys and apologies if this has been asked several times before but my search didn’t really return anything, on cold start I get a rattle under the bonnet for about 3 seconds then it’s gone ... only happens from cold never from warm ... any ideas ??
 
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clarkey2311

clarkey2311

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Nobody ???
 

Wighty

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Hi guys and apologies if this has been asked several times before but my search didn’t really return anything, on cold start I get a rattle under the bonnet for about 3 seconds then it’s gone ... only happens from cold never from warm ... any ideas ??
Maybe timing chain ? , not sure if your model has a weakness in this area ?
 

bembo449

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id go for timing chain tensioner , any other car ive heard that noise , its always been the tensioner that's at fault
 

Avnt

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Hi guys and apologies if this has been asked several times before but my search didn’t really return anything, on cold start I get a rattle under the bonnet for about 3 seconds then it’s gone ... only happens from cold never from warm ... any ideas ??

Does it do it every time? Mine sometimes does it when weathers really cold seems to behave when weathers mild and a couple of goes in the glowplugs


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Avnt

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clarkey2311

clarkey2311

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Does it do it every time? Mine sometimes does it when weathers really cold seems to behave when weathers mild and a couple of goes in the glowplugs


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No not every time, only when it’s really cold ... it doesn’t sound as bad as the one in the clip you attached but it does sound similar
 

Avnt

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No not every time, only when it’s really cold ... it doesn’t sound as bad as the one in the clip you attached but it does sound similar

Do you give it a couple of goes on the glowplugs or just once?


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clarkey2311

clarkey2311

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Only ever once but will give it two goes tomorrow morning and let you know if it’s still happening ... cheers for the tip Avnt
 

Avnt

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Only ever once but will give it two goes tomorrow morning and let you know if it’s still happening ... cheers for the tip Avnt

Mine fired smooth this morning


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clarkey2311

clarkey2311

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As did mine to be fair ... I’ve really only noticed it when it’s say below 5 degrees ... strange
 

alexanderfoti

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Lots of them do it for 1-2 seconds, its relatively normal.

Thicker oil helps but I would stay inside MB spec.

If it rattles for as long as that video, then there is a problem.
 
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clarkey2311

clarkey2311

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Lots of them do it for 1-2 seconds, its relatively normal.

Thicker oil helps but I would stay inside MB spec.

If it rattles for as long as that video, then there is a problem.
Good to know, thanks Alexanderfoti

It did it this morning at 6 degrees even after a double dose of glow plugs but as stated previously it’s two or three seconds then it’s gone
 

alexanderfoti

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Good to know, thanks Alexanderfoti

It did it this morning at 6 degrees even after a double dose of glow plugs but as stated previously it’s two or three seconds then it’s gone

It's because the tensioner is oil pressure driven. Thinner oil drains down quicker overnight.
 
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Pathfinder

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What difference would longer go on the glowplugs have?
 

Avnt

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If its only happening when really cold worth a try


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