E-Class (W212) 2010 - 2016: E 350, E 550

m272 oil leak in water pump possible?

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Old 04-27-2022, 05:00 AM
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2010 W212 E350
m272 oil leak in water pump possible?

Hi, just have a visual check and found an oil leak in a bolt of the water pump. I understand that no oil should be passed thru the water pump. Any idea will be appreciated. Thanks.
Old 04-27-2022, 10:51 AM
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Interesting. The surrounding area is too clean for the leak to be the result of oil migrating down from the timing cover. I would clean it off and monitor it. I don't know for certain, but I wouldn't think there would be any oil galleries near that fastener. I have no idea from where that could source. No oil anywhere else on the surface of the water pump assembly?
Old 04-27-2022, 11:28 AM
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Old 04-29-2022, 04:26 AM
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Thanks. Other areas surrounding that oily bolt are clean. I don't have any idea. Anyway, will clean it, drive the car a few day and then see what will go on....
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Old 04-29-2022, 08:01 AM
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Definitely clean and inspect. Also look around at the timing covers. I have a sneaky suspicion that its coming from above and the cycling of the serpentine belt is forcing it to accumulate at that spot.

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