190Efan

FYI, MB outsells BMW, Audi and Porsche in Germany. You're not an engineer and you don't have a clue. Time to move on from your personal axe grinding. You're such a boring broken record.

chassis

Failing to address the substance of the post again, hmm?

Post reported as a personal attack.

190Efan

I responded directly to your latest broken record post that continues to attack MB on every post you make solely because of a bad personal experience you once had years ago with MB. Your posts make it obvious that you're not an engineer so you aren't able to post anything constructive to help this thread along. I have every right to continue to point this out. You're the one who continually personally attacks me for calling out your bad behavior.

cetialpha5

I'm sure you're familiar with balance shaft problem in the M272 engine. That pretty much affected all 2006 E350's and some 2007 E350's along with many other M272 engines in other cars. But there are many of them out there that didn't have the issue and the estimates range from 10-30% of the cars were affected. Judging just by the number of complaints of bad engines so far, it seems like it's even less than 10% so if it was a bad design, I think it would be affecting a lot more cars. Probably some variable quality control problem which is a common issue in manufacturing. But as usual MB isn't talking so it's really all speculation at this point without any data to back it up. But as with the balance shaft issue, nothing was really done about it, there was some small settlement but it expired and people continue to run into bad engines. In this case, an engine dying suddenly can be said to affect safety so maybe filing a complaint with the NHTSA will cause them to push MB to do something. Nothing happened with the balance shaft as the safety case wasn't really made.

am.gene

@chassis leave that weak **** & negative energy outside these forums, if you don’t like or can’t afford a mercedes take yourself to the buick forums.

190Efan

I think your estimate on the likely number of W205s having the cracked piston problem is a solid estimate. I also agree with you that the issue is a quality control problem. I agree that if it was a design flaw, many more cars would be affected. I also agree that MB isn't doing enough to help the W205 owners who are having the problem.

190Efan

Well said. Thanks for your support.

Moeboss

Hello, here’s my report o the C300 I drive, it’s a year 2015, 4Matic, Sport with AMG wheels, car looks like new, cosmetics and paint is near perfect. till this thing happened while driving, the car loses pressure and started to shake and vibrate violently, luckily I was off the freeway, this could definitely have resulted in an accident.
I took it to a local Mercedes dealership, they kept it for 2 days, and that’s when the surprise estimate repair comes, around $17k repair cost, the whole car is worth 18k. the service advisor said that there’s a broken piston after the technician did some pressure test and confirmed that cylinder 1 has about 85% leakage. I learned afterwards that this is a very common issue on this year and model and Mercedes don’t want to be responsible for it. This is all due to a defective design. So after reading this blog, I’m definitely down to join and have this class action lawsuit signed. Let me know what the next step is. I’m ready!

chassis

Sorry to hear, as you mentioned this is widely known.

The M274 2.0 four cylinder cannot be trusted.

Cosworth2000

Looks like there is a Law Action about this now.

https://www.autoevolution.com/news/f...ue-199411.html

megb

Is this pin wrist issue affects only the 2015 c300 in the US and Canada? What about other countries, like England, Australia?

W205C43PFL

Never heard a single report of it being an issue in anywhere outside of North America, if it was an issue it would had be part of a recall in the countries you mentioned.

megb

ok, I am safe then, I have a C250 German built here in Australia, so far it has 98K and no problems. Thanks for your reply.

juanmor40

The issue is worldwide since the TSB list several models sold nearly everywhere. It does NOT differentiate manufacturing location only engine number sequence.

https://www.tsbsearch.com/Mercedes-B...03-10-P-060916

Has it happened outside of the US? What about this one:
UK:
https://forums.mercedesclub.org.uk/i...e-m274.181862/
https://forums.mercedesclub.org.uk/i...piston.189126/
Taiwan:
https://mbworld.org/forums/c-class-w...ml#post7700229

W205C43PFL

Ouch, I stand corrected, sorry for the bad news forum member megb, that forum member juanmor40 posted, I just went and browsed those posts and it seems like the vehicles were made in the USA (although forum member juanmor40 stated it does not distinguish country but the majority bad batches seems to be coming from the USA), so I guess in that case is if you are in the USA or outside the USA, as long as your vehicle is made in the USA you are vulnerable and more vulnerable than other countries.

juanmor40

The M274 is made in 3 different plants: Europe (likely Stuttgart), China, and the USA (likely the Infiniti/Nissan plant since they share the engine)

https://www.wardsauto.com/2017/merce...verything-well

I doubt Europe is using USA-made engines even for the same brand unless to refill the supply chain in case of backlog.

For interested ones:

megb

Thanks guys for the info I really appreciate it.
I did a VIN search on my car and it shows as Mercedes-Benz AG (GER) but still I'll keep an eye on it you never know with these cars.

W205C43PFL

Best of luck and hopefully nothing bad happens and that everything remains well.

davidijames

Took a while (3 months) but MB finally agreed to repair their 2018 M274 C300 engine (Cylinder 1 failure at 13,000 km) at their expense approx. 12 hrs after I called head office in Germany and after ghosting my local dealership in Australia for weeks on end. Fortunately I did not need a car. Note, I never received a reply from Germany.



Shortly after agreeing to repair my car they advised they needed to replace the engine (also at their expense). A courtesy car was included the same day as they began their works (2 months). Not a sorry or anything of the kind when I picked it up, it did not even get the standard car wash.



What now annoys me is that what I thought was a "New Engine" is in fact just a "Long Block (in which the entire crank assembly including the cylinder head, valves, injection and much more have been completely overhauled and installed using only MB Genuine Parts), compared to a New Engine or New Basic Engine or Basic Engine or Long Block Plus. In short Long Block replacements are a “remanufactured engine” that does not get tested on the manufactures test stand before been sent to the dealership. You can learn more about that at b2bconnect.mercedes-benz.com/gb/products/remanufactured-parts/cars/engines/basic-engine



Even more annoying is that the this Long Block from the "new engine number” 454,306 provided appears to have been produced 86,479 before my failed engine “540,758" OR approx. 47,704 after MB modified their faulty wrist pins that were installed as of engines in 2015 engine number 274 920 30 406 602 on which leads me to believe this engine may have been produced in 2016-2017 ??



Someone please correct me if my understanding about the engine number is incorrect.



Anyway its now been 5 months and with 2,002 km on the engine and is already more noisey on cold starts that the original engine. Transmission also notably louder. I don’t know what to do, I just know I don’t trust this engine, or MB and I will never buy another MB again. Is it all in my head or should I flick it.


If you are interested in what a new m274 long block sounds like with 2,002 km you can download my videos at recorded on a iPhone 101a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov
https://www.icloud.com/iclouddrive/0...40_deg_celsius

1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip
https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO

1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip
https://www.icloud.com/iclouddrive/0...g_celsius_4-10

No warranty was offered on the new long block as it was done under warranty.MB also returned it with a broken PVC line (crank case vent line) and a torn aftermarket pod air filter. Fortunately as soon as I drove it the 2k drive home I inspected their workmanship. Had I not caught this vent line it would not have been too long before I was back for another engine replacement.

juanmor40

Congratulations you got your car back in one working piece. I listened to the audio, and I have driven the M274 a few times (loaner vehicles) but I am not very familiar with the M274 sound (drive M272/M276 vehicles at the moment), but the sound is very reasonable for a 4-cylinder engine. Once warmed up, the sound I would say is very good. Keep in mind you are recording next to it and capturing all kinds of stuff in it: high-pressure fuel pump, injectors, etc

If worried, I would record it every few miles, say 1000 or 2000, and compare recordings until you feel settled on the issue. One thing though, assume severe driving conditions and service the vehicle more often, and use the premium gas as specified. Also, I would not red-line that engine ( I do not do that to any engine anyways ). You can always drive fast if that is your motto without red-lining it, just be patient with it (it is a sec or 2 at most)

davidijames

In Australia our fuel is rather high quality and I only run 98+. I drive aggressively but not before at operating temp and that is way I choose the c300 over the c200.

Cars are made to be driven not baby'ied around and per the MB marketing materials it is advertised as a sports car, that said all gear changes are done manually via the paddleshifts at 4800- 4900 rpm sometimes 5200 rpm if pulling 3rd, 4th and 5th gears. This engine does not make much power over 4900 rpm so pointless to shift any higher.

Engine is always cooled down correctly too (driven between 3000-2000 rpm for a period of time before engine shut off and let to idel bit too, that is if I have been driving hard. In short it is not a driver issue, or poor maintenance issue its a engine issue

juanmor40

I am sorry if I came across wrongly. I agree with you cars are to be driven, and I do drive mine aggressively for some people, but rather tame for others. I do not redline engine perhaps because I am an engineer and I understand the process and its quirks and do not like pay for someone else's compromises.

I meant just be careful it does not fail on you again. I am not here to protect MB by any means of the imagination.

Happy driving

davidijames

Hi Juanmor40 no offence taken at all. I do feel that with the wrist pin issue (potentially sub-par pistons) and many owners not understanding / expecting that this engine takes so long to get to 96 degrees (i.e it is not a car you can jump in and drive hard even after 3 mins), some may be unknowingly pushing their car too much before the engine metals have expanded correctly resulting in damage.

Maybe I will look for some forged pistons, maybe this is the solution if I want to keep this car, or just accept this car cannot be driven. I really do like the c300 but every time I want to go for a long drive or tinder date I always think is this engine going to get me home and this feeling sucks.

BTW I updated my posts with some better recordings from Top and Bottom of engine, hopefully quick to d/l too. 1a M274 2018 Cold Start 3m 30sec - 37-40 deg celsius.mov

https://www.icloud.com/iclouddrive/0...40_deg_celsius



1b M274 2018 Cold Start 35 secs - Bottom Engine Bay + SLOWMO.zip

https://www.icloud.com/iclouddrive/0...e_Bay_+_SLOWMO



1c M274 2018 Cold Start 10 secs at 50 70 80 95 96 deg celsius 4-10.zip

https://www.icloud.com/iclouddrive/0...g_celsius_4-10

W205C43PFL

What a happy ending and agree, engine sounds healthy!

davidijames

So I am considering swapping in some forged pistons. Will contact wossner as I think this listing should read M264 2019 -2021 not M274 2019 - 2021

https://wossnerpistons.com/products/9530

If anyone is interested below are MB part numbers for OEM pistons for the M274 and M264

M274920 Piston Part No : 274920 2740300900
Bore 83.0 mm
Stroke is 92.0 mm
Compression ratio 9.8:1
https://www.motorreviewer.com/engine.php?engine_id=176M264920 Piston Part No : Variant One - 2640302100 AND Variant Two 2640302200 (yep two versions)
Bore 83.0mm
Stroke is 92.0 mm
Compression ratio 10.5:1
https://www.motorreviewer.com/engine.php?engine_id=177