Mercedes M157 Engine Noise
Thread Starter
Member
Joined: Dec 2009
Posts: 126
Likes: 8
GLC Coupe, S63L W222
Mercedes M157 Engine Noise
UPDATE: Issues resolved at the Main dealer. Issue 1 was pulley, issue 2 was water pump/thermostat
Hi Guys,
I haven't had any luck on the W222 forum so I am trying my luck here. I have a Mercedes S63L W222 with the M157 engine. (2016 model year.)
As most M157 engines are the similar/same I would like to get your opinion on this noise in case anyone here has had that on their E63 with the M157 engine.
Took it to Mercedes dealer and they couldn't hear the noise or source the problem. Sadly not many experts on the M157 here in the UK at main dealers. Technician says rarely get M157 engines here. Things I have done so far:
I would be grateful if someone could shed some light
Hi Guys,
I haven't had any luck on the W222 forum so I am trying my luck here. I have a Mercedes S63L W222 with the M157 engine. (2016 model year.)
As most M157 engines are the similar/same I would like to get your opinion on this noise in case anyone here has had that on their E63 with the M157 engine.
Took it to Mercedes dealer and they couldn't hear the noise or source the problem. Sadly not many experts on the M157 here in the UK at main dealers. Technician says rarely get M157 engines here. Things I have done so far:
- Noise seems apparent around the Water pump were the pulleys are.
- I did 3 Compression tests using Xentry with 12 rpm difference (1 test had 25rpm difference). No issues here
- Starts first time, no rough idling or misfires.
- Power is there and quick.
I would be grateful if someone could shed some light
Last edited by sambam2006; Sep 18, 2021 at 07:48 PM.
Senior Member
Joined: Apr 2010
Posts: 394
Likes: 155
2013 E63 P30, 2010 GL550
It is rather hard to diagnose remotely. You probably looked into some of the same places I suggest. Rattling and whistling likely relates to something spinning. See if the noise character changes with revvs. Take the serpentine belt off, examine wear, cracks, oil contamination. Inspect all pulleys for integrity, free rotation where possible. M157 belt drives 3 devices only: alternator, water pump, and A/C compressor. The other pulleys are idler. I replaced my OEM pulleys and belt at 58K miles, and bearings still had life in them for another 20-30K. Best of luck to you.
Thread Starter
Member
Joined: Dec 2009
Posts: 126
Likes: 8
GLC Coupe, S63L W222
It is rather hard to diagnose remotely. You probably looked into some of the same places I suggest. Rattling and whistling likely relates to something spinning. See if the noise character changes with revvs. Take the serpentine belt off, examine wear, cracks, oil contamination. Inspect all pulleys for integrity, free rotation where possible. M157 belt drives 3 devices only: alternator, water pump, and A/C compressor. The other pulleys are idler. I replaced my OEM pulleys and belt at 58K miles, and bearings still had life in them for another 20-30K. Best of luck to you.
Senior Member
Joined: Oct 2018
Posts: 497
Likes: 416
From: NYC
AMG
The digital electronic test is no longer used in later versions of xentry on the M157 any longer.
can you take a picture of your water pump pulley? I would like to see where your belt is on the pulley
can you take a picture of your water pump pulley? I would like to see where your belt is on the pulley
Member
Joined: Jan 2016
Posts: 235
Likes: 69
From: Was, Cali, 95XXX, now Bavaria 91XXX
993 cab, 2014 E63 AMG 4matic T
How many miles on the motor? Have you checked the pulleys when engine off? Any play when you try to wiggle them? I can totally hear what you're trying to describe but nothing else comes to mind.
Have you had an impact on the bottom panels up front? Fender liner loose?
Is the belt tensioner jumping around? Idle sounds solid.
Interesting to find out what it is.
Have you had an impact on the bottom panels up front? Fender liner loose?
Is the belt tensioner jumping around? Idle sounds solid.
Interesting to find out what it is.
Thread Starter
Member
Joined: Dec 2009
Posts: 126
Likes: 8
GLC Coupe, S63L W222
The digital electronic test is no longer used in later versions of xentry on the M157 any longer.
can you take a picture of your water pump pulley? I would like to see where your belt is on the pulley
can you take a picture of your water pump pulley? I would like to see where your belt is on the pulley
And yes you are correct new version of Xentry doesn't allow you to do Compression Test electronically anymore.
Yeah no worries I will take a video and a picture shortly today :-)
Thank you
Thread Starter
Member
Joined: Dec 2009
Posts: 126
Likes: 8
GLC Coupe, S63L W222
How many miles on the motor? Have you checked the pulleys when engine off? Any play when you try to wiggle them? I can totally hear what you're trying to describe but nothing else comes to mind.
Have you had an impact on the bottom panels up front? Fender liner loose?
Is the belt tensioner jumping around? Idle sounds solid.
Interesting to find out what it is.
Have you had an impact on the bottom panels up front? Fender liner loose?
Is the belt tensioner jumping around? Idle sounds solid.
Interesting to find out what it is.
And not tuned either :-(
I wasn't confident loosening the belt so didn't check them for play.
I did visually check when car was running to investigate the noise, may be I think i will do a video for this too later today.
I checked pulleys when engine turned off, they seem solid but then I'm guessing the belt will keep them quite tight so movement will be limited.
Have you had an impact on the bottom panels up front? Fender liner loose?
Is the belt tensioner jumping around? Idle sounds solid
Is the belt tensioner jumping around? Idle sounds solid
The belt tensioner seemed fine but I may be wrong, think it's time I make a video of the engine bay area today lol
Trending Topics
Thread Starter
Member
Joined: Dec 2009
Posts: 126
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GLC Coupe, S63L W222
Top View of Engine Bay (M157):
https://www.youtube.com/
Engine Bay - Different Angles (Cold Start) - M157
https://www.youtube.com/
https://www.youtube.com/
Engine Bay - Different Angles (Cold Start) - M157
https://www.youtube.com/
Last edited by sambam2006; Sep 18, 2021 at 07:49 PM.
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Junior Member
Joined: Jun 2013
Posts: 43
Likes: 6
2008 c300
Are you talking about the diesel like sound or is there another rattling noise that I'm missing? I've always heard that the M157 is a noisy engine when warmed up, some of the noise you're hearing comes from the injectors.
Member
Joined: Jan 2016
Posts: 235
Likes: 69
From: Was, Cali, 95XXX, now Bavaria 91XXX
993 cab, 2014 E63 AMG 4matic T
Release the tension on the belt and check all pulleys. You might need a second person to hold the tensioner. Don't drop the belt though. Not fun to get it all back together.
Senior Member
Joined: Jul 2019
Posts: 488
Likes: 122
C63 Vert
check oil level, drive get the car to temp, then let it sit for 30 minutes should be between low or half. If it is cold full it is wrong in my experience, cold full should be about half an inch above max. If you check right after running it will be low. For my car at least. borescope cylinders.
Thread Starter
Member
Joined: Dec 2009
Posts: 126
Likes: 8
GLC Coupe, S63L W222
Update:
Okay so finally got my car back after waiting over a month for just the part.
Any ideas where to look so I can pin point and get he car in at Mercedes again.
I have the M157 engine, will attach pictures later
Okay so finally got my car back after waiting over a month for just the part.
- Rattle problem has been fixed (Belt Tensioner) BUT...
Any ideas where to look so I can pin point and get he car in at Mercedes again.
I have the M157 engine, will attach pictures later
Junior Member
Joined: Feb 2019
Posts: 27
Likes: 10
From: Pennsylvania
13 S550 4MATIC, 14 S63
Update:
Okay so finally got my car back after waiting over a month for just the part.
Any ideas where to look so I can pin point and get he car in at Mercedes again.
I have the M157 engine, will attach pictures later
Okay so finally got my car back after waiting over a month for just the part.
- Rattle problem has been fixed (Belt Tensioner) BUT...
Any ideas where to look so I can pin point and get he car in at Mercedes again.
I have the M157 engine, will attach pictures later
What did you end up figuring out for this?
