chpu54

Hi everyone,

I just recently purchased a 2012 MB e350 4matic with the m276 motor.
Great car so far but I had once concern, even at the time of purchase.
The vehicle was purchased from a Porsche dealership.
I thought the engine sounded like a diesel motor but was told by the dealer's technician that the direct injectors make this noise.

Still I searched the internet, including this forum, and found these engines have an issue with two timing chain tensioners and check valves.
This TSB is related to the issue: https://www.tsbsearch.com/Mercedes-B...05-10-P-056435
Per this TSB, my engine falls within range for install chain tensioners and check valves.

I am located in Canada.
I called MB Canada who advised I take the car to a MB dealer.
I printed out the TSB and showed it to the service advisor at my local MB dealer.
The dealer could not replicate the problem and stated I should "monitor it".

I made a video during a cold start-up:
Do you guys think I have the issue stated in the TSB or is this normal noise from a m276 motor?
Maybe I am being paranoid.

Appreciate any insight and thanks in advance!

juanmor40

You may want to read, and/or talk to the OP

https://mbworld.org/forums/e-class-w...haft-bolt.html

or an even older thread
https://mbworld.org/forums/e-class-c...up-rattle.html

From that thread, the following is worth watching,


A bit more formal description, w/o non-technical commentary, of the steps to change the chain tensioner only

CaliBenzDriver

I hear direct injectors but no tensioner rattle... do you? What kind of engine oil do you use...5W40, right?

Replacing your upper tensioners is a good idea to preserve the oil pressure that lubricates the cam lobe driving the HPF pump.

Fliplegend

Sounds pretty normal to me.

juanmor40

In any case, have you checked your datacard to see if the Engine is within the TSB?

Just today, another member was discussing his problem at

https://mbworld.org/forums/e-class-w...ml#post8422667

Time to post your VIN (best in that thread)

chpu54

I'm not sure what oil was used. The last oil change was done by the Porsche dealer and there is no indication in the service paperwork or dash sticker what oil was used.

chpu54

That's a great idea. Thank-you kindly!

CaliBenzDriver

While you're dealing with your timing chains maintenance... check for engine oil leaking from 4x camshaft position sensors and VVT actuators.

​​​​These parts benefit from regular inspection to minimize wiring harness contamination.

Senecat

Sounds like a normal clickity-clackity DI motor to me.

S-Prihadi

Yes...normal sound