Second Engine Rebuild... Piston
Thread Starter
Junior Member
Joined: Nov 2019
Posts: 40
Likes: 6
2017 c300 coupe
Second Engine Rebuild C300.. Piston
Doing my second engine rebuild on a car with just 20k on the dash. Can anyone just tell me straight up if there’s an improved oem pistons because clearly the first batch crack and break. Yes or no?
Last edited by hks; Mar 21, 2021 at 07:41 AM.
Out Of Control!!
Joined: Sep 2018
Posts: 14,655
Likes: 4,560
From: unbegrenzt
2017 GLE350 4MATIC
@hks you are working on the 2.0L M274 4 cylinder, correct?
I have seen no posts on pistons that are known to not fail/be good.
A questions is - do the newer M264 pistons interchange with M274? The M264 uses the same crankshaft and connecting rod, and has the same displacement as the M274. This means the stroke is the same, and it is an assumption that the bore is the same.
So far I have not seen M264 piston cracking posted on this site, but it’s still early days for this engine.
I have seen no posts on pistons that are known to not fail/be good.
A questions is - do the newer M264 pistons interchange with M274? The M264 uses the same crankshaft and connecting rod, and has the same displacement as the M274. This means the stroke is the same, and it is an assumption that the bore is the same.
So far I have not seen M264 piston cracking posted on this site, but it’s still early days for this engine.
Thread Starter
Junior Member
Joined: Nov 2019
Posts: 40
Likes: 6
2017 c300 coupe
@hks you are working on the 2.0L M274 4 cylinder, correct?
I have seen no posts on pistons that are known to not fail/be good.
A questions is - do the newer M264 pistons interchange with M274? The M264 uses the same crankshaft and connecting rod, and has the same displacement as the M274. This means the stroke is the same, and it is an assumption that the bore is the same.
So far I have not seen M264 piston cracking posted on this site, but it’s still early days for this engine.
I have seen no posts on pistons that are known to not fail/be good.
A questions is - do the newer M264 pistons interchange with M274? The M264 uses the same crankshaft and connecting rod, and has the same displacement as the M274. This means the stroke is the same, and it is an assumption that the bore is the same.
So far I have not seen M264 piston cracking posted on this site, but it’s still early days for this engine.
to be honest I have no info on the new ones but here’s what I’m trying to get. If you go genuine it’s gonna be the same issue so I figured I will try these out
Out Of Control!!
Joined: Sep 2018
Posts: 14,655
Likes: 4,560
From: unbegrenzt
2017 GLE350 4MATIC
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2012 GL450
I operate a specialty shop in Kansas City (Royal Autowerks) and just bought a 2016 C300 with 68K on it from a client with the loss of compression on cylinder #1 and will perform the detailed teardown (and rebuild ultimately). My client has registered for this class action lawsuit. I recommend that anyone that has had the same concern, reach out to the CA law firm that is pursuing the class-action suit.
https://www.classaction.org/news/mer...ng-m274-engine
I am a former Ford engineer and MIT mechanical engineering graduate (Masters and Bachelors). I have also been a mechanic for 39 years. I have engaged the law firm and will likely end up being the engineering and mechanical expert on this case.
I encourage you to get registered for the suit if you have suffered a loss. Do this before you dispose of the vehicle.
- Jason
https://www.classaction.org/news/mer...ng-m274-engine
I am a former Ford engineer and MIT mechanical engineering graduate (Masters and Bachelors). I have also been a mechanic for 39 years. I have engaged the law firm and will likely end up being the engineering and mechanical expert on this case.
I encourage you to get registered for the suit if you have suffered a loss. Do this before you dispose of the vehicle.
- Jason
