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Applicable Models (Not Applicable to Model 164.156, 204 or 216.386): Equipped with M272 Engine Up to
Serial No. 2729..30 468993 or M273 Engine Up to Serial No. 2739..30 088611.
The material for the balance shaft sprocket and the timing chain guide wheel (idler) was modified on
engines past the serial numbers listed above.
the ... represents 'any number'
Courtesy Efair
Added by jbanks15:
Balance Shaft Gear Issues
M272 engines that were sold between 2004 and 2008 with engine serial numbers below 2729..30 468993 often show early wear of the balance shaft gears, requiring extensive repairs at a retail cost of over $4000. These complaints led to a class action lawsuit against Mercedes Benz (Greg Suddreth and Paul Dunton v. Mercedes-Benz USA, LLC), which alleged the M272 engines are equipped with defective balance shafts gears which "wear out prematurely, excessively and without warning, purportedly causing the vehicles to malfunction, the check engine light to illuminate and the vehicle to misfire and/or stop driving." The suit further alleged that Mercedes knew of this problem, sending out repair bulletins on how to address this issue and ultimately changing the balance shaft gears to avoid this problem. This suit was ultimately dismissed with the judge agreeing with Mercedes that because the gears fail at 60 -80K miles and outside of the warranty period, Mercedes is not legally responsible for these problems. A second class action lawsuit is being organized. [7]
7. "Mercedes Benz named in class action over safety issues related to its M272 or M273 engines". Retrieved Mar 12, 2013.
http://gotaclassaction.com/mercedes...y-issues-related-to-its-m272-or-m273-engines/
**
Do the video test to see if you have the issue, posts 106 and 117 and here
from Michael H.
Video: Check your Balance Shaft Sprocket in 10 minutes.
**
Easy Balance Shaft Check from Brad Wessels here:
Easy Balance Shaft Check Revisited
*
From Lil Don Slk
**
Check your engine number in your free datacard:
FREE!! How to get a free datacard!
**
Here are sister threads on this issue:
Balance Shaft Sprocket
more balanceshaft questions for the pros!
M272 Engine : Fast and Simple Detection of Balance Shaft Failure
Here is Notice of Pendency and Proposed Settlement of Class Action attached
see last pages of this thread for discussion
***
The Balance Shaft/Idle Sprocket settlement was approved by the court
post 156
Read the court document Class Action Settlement Claim Form - PreMail
****
Serial No. 2729..30 468993 or M273 Engine Up to Serial No. 2739..30 088611.
The material for the balance shaft sprocket and the timing chain guide wheel (idler) was modified on
engines past the serial numbers listed above.
the ... represents 'any number'
Courtesy Efair
Added by jbanks15:
Balance Shaft Gear Issues
M272 engines that were sold between 2004 and 2008 with engine serial numbers below 2729..30 468993 often show early wear of the balance shaft gears, requiring extensive repairs at a retail cost of over $4000. These complaints led to a class action lawsuit against Mercedes Benz (Greg Suddreth and Paul Dunton v. Mercedes-Benz USA, LLC), which alleged the M272 engines are equipped with defective balance shafts gears which "wear out prematurely, excessively and without warning, purportedly causing the vehicles to malfunction, the check engine light to illuminate and the vehicle to misfire and/or stop driving." The suit further alleged that Mercedes knew of this problem, sending out repair bulletins on how to address this issue and ultimately changing the balance shaft gears to avoid this problem. This suit was ultimately dismissed with the judge agreeing with Mercedes that because the gears fail at 60 -80K miles and outside of the warranty period, Mercedes is not legally responsible for these problems. A second class action lawsuit is being organized. [7]
7. "Mercedes Benz named in class action over safety issues related to its M272 or M273 engines". Retrieved Mar 12, 2013.
http://gotaclassaction.com/mercedes...y-issues-related-to-its-m272-or-m273-engines/
**
Do the video test to see if you have the issue, posts 106 and 117 and here
from Michael H.
Video: Check your Balance Shaft Sprocket in 10 minutes.
**
Easy Balance Shaft Check from Brad Wessels here:
Easy Balance Shaft Check Revisited
*
From Lil Don Slk
**
Check your engine number in your free datacard:
FREE!! How to get a free datacard!
**
Here are sister threads on this issue:
Balance Shaft Sprocket
more balanceshaft questions for the pros!
M272 Engine : Fast and Simple Detection of Balance Shaft Failure
Here is Notice of Pendency and Proposed Settlement of Class Action attached
see last pages of this thread for discussion
***
The Balance Shaft/Idle Sprocket settlement was approved by the court
post 156
Read the court document Class Action Settlement Claim Form - PreMail
****

FCPEuro is my first choice for on-line MB and Volvo parts. They just published this guide for common problems with the M272/273 engines and I thought everyone here would find it interesting. It is a nice summary of many topics that are covered here on slkworld.
The Definitive Guide To The Mercedes-Benz M272 And M273 Engines - Common Failure Symptoms and Diagnosis
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