2004 W211 E320 CDI engine rattle (straight 6)

matthewins

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W211 E320
I was looking for a rattle under the bonnet yesterday and I can see one of the pulleys the serpentine belt runs round has lots of play in it. By process of elimination it is not the PS pump, alternator, water pump, AC pump or crank so what does that leave? It's one of the larger pulleys, right in the middle of the engine. If somebody has belt routing diagram for a straight 6 W211 E320 CDI then I would be grateful. Many thanks.
 

Frontstep

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T210 320cdi
The tensioner ?
 

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Frontstep

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T210 320cdi
Belt route
 

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matthewins

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W211 E320
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Suspisions confirmed...oil pump. Thanks chaps. Is it painful?
 

Frontstep

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T210 320cdi
Have to wait for someone else or search on here never changed one.
 
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matthewins

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W211 E320
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Think I'm the first one ever! Suspected it was the oil pump straight away and started searching for info. However, since I was getting nowhere, I questioned whether it was the oil pump after all, hence my request for a diagram to confirm. Fingers crossed somebody can help. I'm hoping once the rad and fan are out, a la water pump, it shouldn't be too bad.....
 

alexanderfoti

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W221 S65 AMG - W204 C63 AMG + Various other MB's
On that engine (OM648) im pretty sure the oil pump is chain driven, see printout from WIS:

U5Yiv24.png
 

toby1

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1998 CL420 C140
+1

Not heard of an oil pump driven by the aux belt but maybe there are some
 

Frontstep

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T210 320cdi
I don't think its an oil pump, a guide or tensioner ?
Sorry I think that image is wrong.
 

ROBGOSTY

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2008 219 CLS 320
Think this one is correct, belt does not drive oil pump, likely to be the big tensioner attached to waterpump

 

Alex Crow

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W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
My guess is water pump, not unusual on these to fail.
 

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