Help with sound! - Page 2 - MBWorld.org Forums

Mar 30, 2023 | 08:18 AM

#26

vincheung

Super Member

Joined: Nov 2016

Posts: 609

Likes: 277

From: NYC

S63, GLE580, BV250

What brand and grade of oil are you currently using? If it's quieting down when things get to operating temp I would lean towards oil related.

Mar 30, 2023 | 09:01 AM

#27

Tylek Douglas

Thread Starter

Junior Member

Joined: Mar 2020

Posts: 23

Likes: 1

2014 Mercedes S550

Quote:

Originally Posted by vincheung

What brand and grade of oil are you currently using? If it's quieting down when things get to operating temp I would lean towards oil related.

mobile1. 0 w40 full synthetic not quiet but not as loud

Mar 30, 2023 | 09:08 AM

#28

jcat

Senior Member

Joined: Aug 2011

Posts: 356

Likes: 19

From: RI

2017 S550 4matic

that's the right oil, I wouldn't expect the ceratec to magically fix this issue but might help some.

Apr 2, 2023 | 03:59 PM

#29

Tylek Douglas

Thread Starter

Junior Member

Joined: Mar 2020

Posts: 23

Likes: 1

2014 Mercedes S550

Quote:

Originally Posted by Tylek Douglas

I haven’t tried this. I’ll try it today and report back. It definitely comes down a notch or two when it gets hot.

I removed the Vbelt and yes the sound is still there .

Apr 2, 2023 | 04:01 PM

#30

Tylek Douglas

Thread Starter

Junior Member

Joined: Mar 2020

Posts: 23

Likes: 1

2014 Mercedes S550

Quote:

Originally Posted by jcat

that's the right oil, I wouldn't expect the ceratec to magically fix this issue but might help some.

I put the two cans in and went on a road trip just got back home almost 600 miles later it’s still there. Smh I don’t even know what to do at this point.

Apr 2, 2023 | 04:09 PM

#31

VII

Super Member

Joined: May 2011

Posts: 978

Likes: 274

From: Fort Worth TX

2020 S560, 2014 SLK55 (Prev. 2016 S65, 2013 SLK350, 2008 CLS63, 2006 E350, 2006 CLS500, 2005 C230K)

With what you've described I would lean towards a bad lifter but would scope the bores to make sure there is no premature wear.
Too bad there are no cam covers anymore as a simple next move would been to remove and inspect.

Apr 3, 2023 | 09:02 AM

#32

Tylek Douglas

Thread Starter

Junior Member

Joined: Mar 2020

Posts: 23

Likes: 1

2014 Mercedes S550

Quote:

Originally Posted by VII

Thanks for your help. I’ll try a shop and have them to scope it to see what shows. If anything I’ll report back when I get an answer for anybody in the future. I’ve found nothing online about this issue.

Apr 3, 2023 | 10:20 AM

#33

cfmistry

MBWorld Fanatic!

Joined: Jan 2015

Posts: 1,019

Likes: 358

15 S550 4Matic, 86 560SL

Unfortunately that does not sound good.. I also believe it to be interference from the cams. I have heard about this issue on other M278s but it is very rare. Please let us know what you find!

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Apr 3, 2023 | 11:13 AM

#34

Tylek Douglas

Thread Starter

Junior Member

Joined: Mar 2020

Posts: 23

Likes: 1

2014 Mercedes S550

Quote:

Originally Posted by cfmistry

Unfortunately that does not sound good.. I also believe it to be interference from the cams. I have heard about this issue on other M278s but it is very rare. Please let us know what you find!

Thanks I definitely will.

Apr 3, 2023 | 03:41 PM

#35

Tylek Douglas

Thread Starter

Junior Member

Joined: Mar 2020

Posts: 23

Likes: 1

2014 Mercedes S550

Quote:

Originally Posted by cfmistry

Unfortunately that does not sound good.. I also believe it to be interference from the cams. I have heard about this issue on other M278s but it is very rare. Please let us know what you find!

Is there a way to check the valves with just taking the valve covers off ? I’m leaning towards a valve issue

Apr 3, 2023 | 04:00 PM

#36

VII

Super Member

Joined: May 2011

Posts: 978

Likes: 274

From: Fort Worth TX

2020 S560, 2014 SLK55 (Prev. 2016 S65, 2013 SLK350, 2008 CLS63, 2006 E350, 2006 CLS500, 2005 C230K)

IIRC the 278 does not have a valve cover, at least not a traditional you can just take off and put back on.

Edit: Yes with the integrated cam journals the "cover" is more comprehensive and will require the removal of the front cover and ancillaries at the rear on top of the DFI injectors, so a couple of hours extra per side.

Last edited by VII; Apr 3, 2023 at 04:10 PM.

Apr 3, 2023 | 04:12 PM

#37

VII

Super Member

Joined: May 2011

Posts: 978

Likes: 274

From: Fort Worth TX

2020 S560, 2014 SLK55 (Prev. 2016 S65, 2013 SLK350, 2008 CLS63, 2006 E350, 2006 CLS500, 2005 C230K)

You can get a preliminary view of the valvetrain from just the cover but to be able to really check things you'll need to remove the cams.

Apr 3, 2023 | 05:21 PM

#38

DaveW68

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Joined: Nov 2014

Posts: 4,242

Likes: 629

From: Chicago burbs

2015 S550

That noise "could be" the hydraulic chain tensioners. This is a known issue with the 2014's. It is rectified by adding a check valve to the tensioners. MB TSB #LI05.10-P-056435. You should have your local dealer or MB mechanic diagnose it to see if this could potentially be the problem.