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Engine sound in 2014 E350, M276 engine

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Old Mar 18, 2021 | 02:32 AM
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2014 E350 station wagon gasoline
Engine sound in 2014 E350, M276 engine

Hi all,

MY 2014 E350 station wagon with about 60K miles on it. Regular oil changes at around 6k miles, always used BEVO approved Castrol Edge 5W-40 A3/B4 synthetic oil.
The engine is loud at idle, engine fully warmed up, the rattle goes away at increased rpm. I heard another M276 engine on youtube, it sounded exactly the same as mine so I am just wondering if this is the normal sound for this engine.
Please have a listen:
Attached Files
File Type: avi
M276-engine-sound-CONVERTED.avi (14.63 MB, 195 views)
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Old Mar 18, 2021 | 07:59 AM
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S212 E350 Estate
Sounds like a normal direct injection engine at cold start.
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Old Mar 18, 2021 | 08:20 AM
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2017 GLE350 4MATIC
The M276 is fairly loud, I believe it is the high pressure fuel pump, mounted at the rear of the right (passenger side LHD) cylinder head.
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Old Mar 18, 2021 | 08:25 PM
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2014 E350 station wagon gasoline
Originally Posted by chassis
The M276 is fairly loud, I believe it is the high pressure fuel pump, mounted at the rear of the right (passenger side LHD) cylinder head.
Thanks chassis, I will take a closer listen as to where the sound is really coming from.
Fliplegend, the engine was fully warmed up when i took the video..
I don't have the start up rattle, the engine has the optimized tensioners installed already, although not the check valves, nevertheless start up sound is normal.
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Old Mar 18, 2021 | 10:14 PM
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2016 E350 Sedan
I recently changed the spark plugs on my 2016. (followed Sr.Leigh's tutorial)
When I started the engine with the hood open and in my garage I really thought i had done something incorrect in the plug job. It was making a racket ! It sounded somewhere between a coffee grinder and a ModelT.
Engine idled down, closed the hood sound went back to normal.
We have sound insulated hoods and inner fenders, as well as a belly pan.
Also,I think direct injection and the 60 degree V of the 276 adds to the noise.
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Old Mar 19, 2021 | 01:58 AM
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2014 E350 station wagon gasoline
Originally Posted by Alandf
I recently changed the spark plugs on my 2016. (followed Sr.Leigh's tutorial)
When I started the engine with the hood open and in my garage I really thought i had done something incorrect in the plug job. It was making a racket ! It sounded somewhere between a coffee grinder and a ModelT.
Engine idled down, closed the hood sound went back to normal.
We have sound insulated hoods and inner fenders, as well as a belly pan.
Also,I think direct injection and the 60 degree V of the 276 adds to the noise.
It sounds like it is a normally "loud" engine then.
I tried to find that guide, (Sr.Leigh's tutorial), but couldn't.
Is it on this board?
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Old Mar 20, 2021 | 10:36 PM
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Originally Posted by dacia
It sounds like it is a normally "loud" engine then.
I tried to find that guide, (Sr.Leigh's tutorial), but couldn't.
Is it on this board?
I think this is it

https://mbworld.org/forums/e-class-w...ovid-19-a.html
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Old Mar 21, 2021 | 09:19 PM
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2014 E350 station wagon gasoline
Got it, thanks. That guy has some good videos of W212 maintenance.
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