kevm14

Yes but if we are talking about M278s, there are barely any E550 coupes with the cast iron liners. Probably barely any S550s. And really maybe mostly later X166 GLS550s. It's a small sample set.

thtguy

I would say most 2016 GL550 fall after the engine number listed at the top of the thread, which also means all 2017-2019 GLS550 would also..

kevm14

Yes and those are not that old with not a lot of miles on many cases. When our 12-14 M157s were that age we thought the M157 had no issues at all.

thtguy

Very true.... though I have heard of M157s with the issue in the 30k mile range, but only a few.

wheatswake

I have a 2013 E550 coupe (M278), engine went bad at 45k miles in 2019. Mercedes replaced block and right head ($3k under Goodwill Assistance with 3yr/36k warranty), I took it. I am thinking the old block was silitec and hoping new block is nanoslide. New block currently at 50k miles. Any part # to ref on old vs new block?

MBNUT1

Define "went bad"

wheatswake

Right bank started smoking out exhaust under load off the line, Indy stated washed cylinder from injector stuck open, dealership stated scored cylinder.

MBNUT1

Thanks for the reply.

MBNUT1

Which brings up a point is the issue the cylinder wall material or the fuel injection system?

kevm14

An injector carboning up (reduced flow) is also noted to cause increased cylinder/piston temps, which can also score the cylinder. So yeah, the fuel system seems culpable here.

JettaRed

iTrader: (1)

Wondering why an injector would carbon up since it is continuously washing the tip with fuel. I'm not saying it doesn't since all the fuel additive companies say their stuff "cleans fuel injectors", just wondering why it does. If you are experiencing increased temps because of obstructed injectors, it's because you are running lean.

kevm14

It's something I've read on here. Haven't seen it personally.

wheatswake

I wish the injectors were designed to fail close upon full open position vs pulsating. I would think this would protect the cylinder from being washed.

Xavier Smith II

Cylinder scoring in the M156 is pretty much unheard of, same with the M276 TT which uses Nanoslide as well.

Nanoslide is by far the best lining available.

anderson123

I have a s550 and the engine code is 278929 30 282755. I wanted to know is this still a siltec produced m278? It’s a 2016 s550 coupe vin WDDXJ8FB6GA012621. Thanks in advance!

juanmor40

Here id you datacard, latest engine revisión AFAIK
number higher than 30 266xxxx

Tynee

Not to hijack a thread, but for the 6cyl M276 engine, I'm trying to figure out when they switched back to cast iron.
Is there an engine code cutoff number for that engine that anyone knows?
In using that decoder, here is the engine code of a GL I am looking at, curious if it has cast iron liners: Engine 642826 41 765960

juanmor40

It is my understanding that M276 has always been cast iron liners. I think even the 3.0L TT uses the same block design.

MBNUT1

From what this says the M276 started out with cast iron liners and transitioned to a nanoslide coated aluminum block.

https://www.motorreviewer.com/engine.php?engine_id=173

juanmor40

I guess there is conflicting information out there, below from March 2022:

https://automotivetechinfo.com/wp-co...and-Tricks.pdf

MBNUT1

Nanoslide might have been introduced with turbocharged M276 (M276.8).


Attachment courtesy our favorite W212 forum member.

zenderV8

good day


It's fascinating to consider the technology introduced to assemble an aluminum block with cast iron barrels, as those are very different materials and high tech we can see with Silitec and Nanoslide. Could it be as simple as a sleeve? and if so the renewal should be very simple. Has anyone come across some details?

DeanMassy

I missed the iron by a few months... Something to keep in mind if I buy another one.

kevm14

Iron liners can score, because it has happened since day 1 of the internal combustion engine. The question is, are later M278s (or even M157s) somehow, fundamentally, better and longer lasting? Do we really have data on this? We know early timing chain systems are problematic, sure. But that's only the start of the potential list of issues.

MBNUT1

This guy has gotten 330K miles out of his M278 with cast iron liners.
https://mbworld.org/forums/s-class-w...ing-boost.html