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Tensioner pulley on M278

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Old 07-27-2022, 09:12 PM
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2012 E550 4MATIC
Tensioner pulley on M278
I have a 2012 E550 with the M278 engine. I can't figure out how to release tension on the belt. I know usually there is a 17mm nut to push and put a pin in, but there is none around the tensioner pulley. Looking all around there isn't anything I can put a socket wrench on. I tried looking online but no examples were of the same engine.
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Old 07-27-2022, 11:14 PM
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MY'14 W212 M276 3.5NA @55kMi
uncommon tensioner
Go ahead take a good picture of the tensioner in your car facing the front side (not the top ) so we can point out things to help.

It's an excellent idea to replace the trouble making belt tensioner ✌️
Last edited by CaliBenzDriver; 07-28-2022 at 02:36 PM.
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Old 08-01-2022, 04:53 AM
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2012 E550 4MATIC
I actually got it figured out. Didn't know pulley bolts are reversed. On this engine it's in the center of the tensioner pulley and it's a 14mm.
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