Second that... Is this a failure that is destined to affect all the engines built within the period or only some of those within the period. I am going to assume it is only a minority of the engines built during the period

 

since this bulletin was just issued they may not have known what it could be. I would take it back next chance you get so they can see if this applies to your car.

 

i called them today and it will go in next week...mine makes the knock interemitently though...i checed my engine number is 273971*30395748 and built date is 08/10...2011 e550 with 26000 miles
does this qualify?

 

It appears to since the build date is with range and the engine is before the cutoff of 2739xx 30441186.Be sure to mention the bulletin to them so they can check it against that themselves. LI03.10-P-052286

Post back and let us know what they say.

 

it appears bulletin dates back to 2011?

 

^I was going to say the same thing. This bulletin dates back to Fall of 2011.

 

You're correct. I don't know what I was thinking. The date is clearly there.

 

no problem...does not seem that there have been too many issues then?

 

Anytime a piston wall gets scored it's generally one of two things. Either the wrist pin bearings are worn out of spec or it's a heat issue. Heat issue causes the piston to expand beyond the clearance causing scuffing between piston and bore. Worn wrist pin bearing causes the piston to wobble in the bore which will sound like a rattle and a clatter that increases with rpm.

 

Got my car back last night. Complete reman engine was installed. Scary diagnosis if you see the writeup. All cylinder walls scratched and pitted ..... damn!!

It runs good. No major difference from before, engine is quieter and acceleration is a tad improved. Still waiting on "extras" from MBUSA.

 

Congrats on the new engine!

 

What kind of "extras" did they promise you or you will be expecting?

 

Dealer is shooting for either complimentary maintenance up to CPO warranty expiration OR a "deal" on a ML350BT that is in my to-buy list in the near future.

 

Good news, I trust your new engine will prove none the worse in comparison with your old one

 

took car in today..engine is a quiet as a mouse....lol
hope thay can replicate problem..

 

If engine is within range, does MB will replace under warranty the engine with a RM one? Even if car is out of warranty?

 

I don't think this is a recall, only a bulletin on how to repair if condition is present. If under warranty, the it's on MB's dime. If not, then I assume the customer would have to pay for repairs.

 

Wise choice, to the OP! Congrats... a brand new engine is a sweet deal when you think about it.

I bet the mechanics LOVE this type of work... beats your typical b.s. that they deal with all day...

MBUSA gave me $2k towards warranty, tire/wheel, and prepaid maintenance when I get a full refund for my '550.... they really come through if you're nice to them and be patient and play the game... I'm impressed with MBUSA all around. I wrote a letter of thanks to steve cannon and he wrote me back appreciating my appreciation of the company and my accolades to the service department that took care of me.

 

You a a100% right. Its some sort of "warranty bulletin", my engine is within range of possibly having the issue.

 

After hearing again my engine,I dont think mine has a knock or a rattle, I think I only can hear the direct injection sound. But anyway I will take the car to the dealer with the bulletin, so they can certify its ok and the issue is non existent. Any other comments by the OP's ?

 

your info shows you drive a 2009 C300. I don't think the C300's M272 3.0V6 has direct injection. So unless the listed vehicle is wrong, if you are hearing direct injection noises, then something is not right with that M272 engine.

 

The 2010 E350, I have had it only since last Thursday. I am planning on keeping my C300. I assume its a direct injection noise in my E350, but maybe I am wrong. Its for sure not a clanking, rattling or knocking type of noise. I am no expert, and am open to any OP suggestions.

 

2010 E350 also used the M272 engine without direct injection. DI came on the 2012 and newer M276 3.5 v6

 

Ok. Maybe a faulty belt tensioner or pulley?

 

I don't know what it could be, but if a non-DI engine is making DI noises, I'd have it looked at.