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M274 Engine

pcthrillrider2 said:
does it have timing chain problems? is it a double row chain?
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It's a double chain, and it's not a known source of problems.

BTW, the issue with the timing gear on the M271 engine, was not so much due to the single row chain, instead it was more to do with the camshaft sprocket wheels and with the hydraulic tensioner.

The most common problem with the M274 engine, BTW, is a failed thermostat, which is costly to repair (compared to thermostat replacement costs on other engines).
 
markjay said:
It's a double chain, and it's not a known source of problems.

BTW, the issue with the timing gear on the M271 engine, was not so much due to the single row chain, instead it was more to do with the camshaft sprocket wheels and with the hydraulic tensioner.

The most common problem with the M274 engine, BTW, is a failed thermostat, which is costly to repair (compared to thermostat replacement costs on other engines).
Click to expand...
electric on that engine isnt it? hence the high price
 
markjay said:
Yes, and also the location (almost) under the engine bloke means you have to pay for 3 hours work.
Click to expand...

Mercedes M274/M270 Engine Problems and Reliability​

The M274/M270 engine family has several weak components here and there. The first one is the camshaft actuators (solenoids). Usually, after 60-70k miles, these engines start producing some kind of noise while they cold. This is a sign of wear inside camshaft adjusters. In 2014, engines got modified actuators (part no. A2700501147) that hold a little bit longer.

The second problem refers to the rapid wear of the timing chain. Its lifespan is approximately 80k miles (plus or minus 20k). The next problem with which you may encounter on the exact the same mileage is turbocharger failure. The problem with the turbocharger is not very common, but it still has a place to be.

How reliable the M274/M270 will be over time depends on many factors. As usual, Mercedes things need care and proper maintenance, probably more often than the manufacturer requires on a schedule.

thats where i read the timing chain problems from
 
pcthrillrider2 said:

Mercedes M274/M270 Engine Problems and Reliability​

The M274/M270 engine family has several weak components here and there. The first one is the camshaft actuators (solenoids). Usually, after 60-70k miles, these engines start producing some kind of noise while they cold. This is a sign of wear inside camshaft adjusters. In 2014, engines got modified actuators (part no. A2700501147) that hold a little bit longer.

The second problem refers to the rapid wear of the timing chain. Its lifespan is approximately 80k miles (plus or minus 20k). The next problem with which you may encounter on the exact the same mileage is turbocharger failure. The problem with the turbocharger is not very common, but it still has a place to be.

How reliable the M274/M270 will be over time depends on many factors. As usual, Mercedes things need care and proper maintenance, probably more often than the manufacturer requires on a schedule.

thats where i read the timing chain problems from
Click to expand...

Not sure who wrote that, but having been a member of this forum for the past 16 years, I can say with a high degree of certainly that issues with the M274 engine (apart for the thermostat) are rare... I also had a car with the M274 engine for 5 years and the only issue was the thermostat, but that's a sample pool of one.

In short, apart from the thermostat, I don't expect any issues with the M274 engine.
 
markjay said:
Not sure who wrote that, but having been a member of this forum for the past 16 years, I can say with a high degree of certainly that issues with the M274 engine (apart for the thermostat) are rare... I also had a car with the M274 engine for 5 years and the only issue was the thermostat, but that's a sample pool of one.

In short, apart from the thermostat, I don't expect any issues with the M274 engine.
Click to expand...
ok thank you,hopefully the merc i buy the thermostat has already been done!
also took my car in today for thermostat merc indie PMW chelmsford quoted me £436 that seems a lot for only 3 bolts that hold it in it's east to get to aswell OM646 engine
 
pcthrillrider2 said:
ok thank you,hopefully the merc i buy the thermostat has already been done!
also took my car in today for thermostat merc indie PMW chelmsford quoted me £436 that seems a lot for only 3 bolts that hold it in it's east to get to aswell OM646 engine
Click to expand...

No idea about the cost of replacing the thermostat on the OM646 engine, but regarding the thermostat on the M274 engine, expect to pay around £350 at an indie (parts and labour), or double that at the dealer.
 
It was the valve in the waterpump that went on mine, but this fault can manifest as a failed thermostat. Check the movement of the waterpump valve actuator before diving in to the thermostat, otherwise you might end up with 2 expensive jobs. If the pump valve is sticky it is possible to bodge it open and remove the actuator lever so it never closes again. Sometimes the lever is broken anyway.
 
markjay said:
Not sure who wrote that, but having been a member of this forum for the past 16 years, I can say with a high degree of certainly that issues with the M274 engine (apart for the thermostat) are rare... I also had a car with the M274 engine for 5 years and the only issue was the thermostat, but that's a sample pool of one.

In short, apart from the thermostat, I don't expect any issues with the M274 engine.
Click to expand...
^This.
Likewise, I ran mine for 5 years (C180) with no engine - based issue other than the common thermostat problem and partial failure of the flexible line from the solid fuel feed to the HPFP; there's a modified part and clamps for that and it's also an awkward job with the HPFP being right up against the firewall.
 
From what I have heard, the M274 CGI has a special timing chain and stringent timing requirements.
At least some years ago, it was not uncommon to have the "Check Engine" indication turned on
as the timing went out of tolerance. This happends at ~15.000 km +/- a few thousand km.

If Mercedes has made some improvements on the engines before it was discontinued
I do not know. The chain is not expenceive but the tensioner needs to be replaced as,
according to my sources, it can not be reset to its initial value and the replacement is
"messy".
 
I'm looking to purchase a 2018 GLC 250 petrol which has the m274 engine

Does anyone know if the issues are still outstanding with this engine or have they been resolved with this model year?
 
ash1212002 said:
I'm looking to purchase a 2018 GLC 250 petrol which has the m274 engine

Does anyone know if the issues are still outstanding with this engine or have they been resolved with this model year?
Click to expand...
I wouldn't worry about the engine...I would check out the crabbing though.
 
The M274 engine is reasonably reliable - bit coarse mind. Bear in mind, it has 2 x NOX sensors. For what reason I do not know on a petrol but they're £600 each to replace, and seem to go very often
 
SpikyMikey said:
Would the M274 have been introduced at face-lift time of the 204?
Click to expand...
No, the first 2011 facelift cars still had the M271 engine. The M274 was introduced around a year later, in mid-2012.

All pre-facelift cars equipped with a 4-Cyl petrol engine will obviously have the M271 engine.
 
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