Balance shaft sprocket M272/M273 (Stickied) - Mercedes Benz SLK Forum
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#1 Old 11-23-2013
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Balance shaft sprocket M272/M273 (Stickied)

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-...-m273-engines/

**********************************
Do the video test to see if you have the issue, posts 106 and 117


**********************************
Check your engine number in your free datacard:

FREE!! How to get a free datacard!
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Here is a sister thread on this issue:
Balance Shaft Sprocket

more balanceshaft questions for the pros!

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 https://eclaim.kccllc.net/caclaimforms/mse/docs.aspx
************************************

Attached Files
File Type: pdf MSE_NOT.pdf (61.7 KB, 95 views)
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#2 Old 12-08-2013
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My engine (272963 30 003441) seems to fall within the range. If I were to encounter balance shaft issues what would the symptoms be, and what could I do to be proactive against it?
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#3 Old 12-08-2013
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Originally Posted by Akonion View Post
My engine (272963 30 003441) seems to fall within the range. If I were to encounter balance shaft issues what would the symptoms be, and what could I do to be proactive against it?
Often there are no major symptoms until the CEL comes on. If you have STAR, you can periodically check for codes relating to cam bank timing issues. Other than that there is the visual inspection technique for checking the cam bank timing marks are still aligned (search on here for link to video).

Not much you can do to be proactive about it - if it's going to happen, it's going to happen.

Cheers,
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#4 Old 12-08-2013
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Quote:
Originally Posted by bac View Post
Often there are no major symptoms until the CEL comes on. If you have STAR, you can periodically check for codes relating to cam bank timing issues. Other than that there is the visual inspection technique for checking the cam bank timing marks are still aligned (search on here for link to video).

Not much you can do to be proactive about it - if it's going to happen, it's going to happen.

Cheers,
Brian
Damn.. I know that the sprockets are not too expensive, but is the labour on them killer? If this may be an issue I want to budget for it.
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#5 Old 12-08-2013
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Damn.. I know that the sprockets are not too expensive, but is the labour on them killer? If this may be an issue I want to budget for it.
Engine must be removed from car and I think other parts are also required to be changed while it is out. At some point Mercedes actually put together a kit of parts needed to address the issue. Google and you should find it.

I believe the labour component of the job is north of 50 hours. Total cost figures I have seen reported vary between $4K-$10K.

Cheers,
Brian

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#6 Old 12-10-2013
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My invoice shows the balance shaft kit at $465 USD. Motor mounts, head gaskets, intake gasket, tensioner, breather cover, cam sensors, cam actuators, and fluids brings the parts tally up significantly though -- to about $1400.
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#7 Old 12-23-2013
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Quote:
Originally Posted by jbanks15 View Post
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.

Courtesy Efair
Hi, since what model year could we say this issue was resolved? I am looking to buy a used one and it would be easier for my search.
Thanks!
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#8 Old 12-23-2013
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see the reply by Woolly in your other post. Oil was usually 2005 and sprocket 2006-8


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#9 Old 01-26-2014
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Found this amateur video showing exactly what a worn balance shaft looks like and its location within the engine. Also gives tips on repairing the job yourselves... yeah, good luck.




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#10 Old 05-14-2014
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SLK 280 Balance Shaft Problem

Are there any other people on here in the UK that has had this issue?

I have recently purchased an SLK 280 and have now been told that balance shaft needs replacing at a cost of £5000+

Car is 2007 and only 22,000 miles

Repair represents almost half the cost of the car :-(

Rob
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#11 Old 05-14-2014
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Very sorry to hear it! Would have thought it quite unlucky to strike this problem on a 2007 car...

Have you tried approaching Mercedes directly for a goodwill gesture given the very low mileage and the fact that it's a well known problem?

Hope things eventually turn out OK.

Cheers,
Brian
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#12 Old 05-14-2014
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Originally Posted by RobHufton View Post
Are there any other people on here in the UK that has had this issue?

I have recently purchased an SLK 280 and have now been told that balance shaft needs replacing at a cost of £5000+

Car is 2007 and only 22,000 miles

Repair represents almost half the cost of the car :-(

Rob
Seems like very low mileage for this to be showing up. What are the symptoms and what has been done to confirm the problem? Is a second opinion warranted? Since you just recently purchased the car does the seller share any obligation here?
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#13 Old 05-15-2014
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Originally Posted by bac View Post
Very sorry to hear it! Would have thought it quite unlucky to strike this problem on a 2007 car...

Have you tried approaching Mercedes directly for a goodwill gesture given the very low mileage and the fact that it's a well known problem?

Hope things eventually turn out OK.

Cheers,
Brian
Thanks very much Brian,

I have asked my local MB service manager to ask MB if there is a possibility of contribution towards this known problem, but he does not hold out much hope as car is more than 6 years old :-(

Regards,

Rob
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#14 Old 05-15-2014
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Seems like very low mileage for this to be showing up. What are the symptoms and what has been done to confirm the problem? Is a second opinion warranted? Since you just recently purchased the car does the seller share any obligation here?
Hi there,

Car has fault codes 1200 & 1208 (P0017 & P0017) which are usual indicators, plus cog fragments found in my engine are pretty conclusive...

I purchased car with 3 months seller warranty which has now expired

Regards,

Rob
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Different Part Number for improved part?

Wife drove home today from running an errand, describing the rough running and CEL that came on - I fear the sprocket issue is saying, "Hello!" Our SLK350 has about 41,000+ miles.We'll be taking it in tomorrow.

Didn't have luck searching but I apologize if this is answered already...what I'm curious about is did Mercedes come out with an improved sprocket to replace the problematic one? Is there a part number revision from the old part number that confirms there is a change? Just would like to know if this is going to become a "regular replacement part" to be aware of, or the fix is a long term/permanent solution.
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#16 Old 07-06-2014
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per efair's post above:

My invoice shows the balance shaft kit at $465 USD. Motor mounts, head gaskets, intake gasket, tensioner, breather cover, cam sensors, cam actuators, and fluids brings the parts tally up significantly though -- to about $1400.


so i think it would be the parts kit n not just the sprocket.

i checked epc and there is no new 'shaft/sprocket' replacement number i can find


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#17 Old 07-06-2014
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Ooo man, that doesn't give me the warm fuzzies. I'll give up thinking about it until tomorrow - no sense in wasting the last hours of a long holiday weekend dwelling on it. Jeff - your powers of replying to all these posts - amazing! Thanks!
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Don't panic -- the balance shaft symptoms aren't "sudden onset" like this; plus there are specific codes for the problem. Have your codes read and cleared for free -- most parts places offer this service (just be sure you write them down before they're cleared). Let us know what they are.
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Originally Posted by Sandtoes View Post
Just would like to know if this is going to become a "regular replacement part" to be aware of, or the fix is a long term/permanent solution.
It seems only Mercedes knows the statistics on this sprocket failure. The teeth wear occurrence is sporatic; I've found the mileage range to be from 20k-120k. How are some cars having this issue at only 20k miles?

My trusty mechanic says if you use a good oil (not Mobil 1), and change your oil every 5k miles, you will not see this sprocket wear problem. The main goal for engine oil is to prevent wear of the internal metal parts. There is a reason why Mercedes updated the oil change interval from 12k miles to 5-6k miles.
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Quote:
Originally Posted by RobHufton View Post
Hi there,

Car has fault codes 1200 & 1208 (P0017 & P0017) which are usual indicators, plus cog fragments found in my engine are pretty conclusive...

I purchased car with 3 months seller warranty which has now expired

Regards,

Rob
If the car was purchased less than 6 months ago you would still have have the a
Sale Of Goods Act.
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