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2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair

Posted By: The Critic

2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 09:46 AM

Vehicle: 2012 Mercedes-Benz C250 Sport w/1.8L M271Evo Turbocharged Engine.
Mileage: 86K

This car belongs to a buddy of mine. He was experiencing long cranks (2-3 sec to start) and a check engine light (CEL). When the engine finally started, there was a loud clatter for several seconds. When scanned, the fault code was a P034062. Since my buddy was planning to sell the car, he had to fix the issue in order for the car to pass the CA Smog Inspection (CEL is an automatic fail); you cannot sell a car in CA that does not pass smog inspection unless it is being sold as a non-operational vehicle.

After some initial testing and research, the issue was isolated to the intake camshaft adjuster (phaser). My scan tool was unable to perform the cam adjuster test so I sent the car to the dealer for diagnosis (1hr - $198). The dealership returned with the same diagnosis but recommended replacement of both cam adjusters (intake and exhaust). The dealer's estimate was $5600. After some additional research, replacing both adjusters is standard practice when addressing this issue. I took some pictures of the repair process below:

After removing the air intake hose (a $216 hose w/sensors that crumbled when touched), drive belt, alternator, thermostat, p/s hard line and valve cover, we are left with this:

[Linked Image]

After setting the crankshaft to TDC and taking a closer look of the intake cam adjuster (the failed one), we can see that the mark on the camshaft (middle mark) no longer matches up with the reference arrow. The camshaft timing is noticeably advanced. Apparently, this indicative of a worn/failed camshaft adjuster.

[Linked Image]

At this point, I removed the one-time use timing chain tensioner and attempted to install the hold-down tool. Since the intake cam was obviously advanced, I tried to manually move it back to its correct spot and install the tool. This worked (barely) but I was still unable to install the tool on the exhaust cam.

Let's take a closer look at the marks for the exhaust cam and exhaust cam adjuster:

[Linked Image]

From an initial look the exhaust cam adjuster appears OK. But as it turns out, the exhaust cam was slightly retarded. So even though the exhaust cam adjuster was not displaying any faults, there was some slight wear on this adjuster as well and perhaps this is why dealers often recommend replacing both adjusters at the same time. And both adjusters have gone thru multiple revisions. I sent these pictures to a few trusted contacts and all of them suggested replacing both adjusters.

Now let's revisit the marks after the adjusters were installed, new tensioner installed (and extended), and after the engine was spun-around several times.

Intake Camshaft Adjuster:

[Linked Image]

As you can see, the middle mark is now where it should be.

Exhaust Camshaft Adjuster:

[Linked Image]

Not a huge difference compared to the "before" picture, but this was enough to allow the cam locking tool to just drop into place.

Here is a picture of both new adjusters installed:

[Linked Image]

The at the 3 o'clock (exhaust) and 9 o'clock (intake) sprockets do not align perfectly. I have seen pictures of these marks aligning with a new chain. So, I think the chain in my engine has some wear. Since the tensioner was not fully extended and there were no cam/crank correlation codes, I skipped chain replacement at this time.

Here is a picture of the engine after being fully reassembled, minus the engine cover:

[Linked Image]

List of parts used:

[Linked Image]

After bleeding the cooling system and the p/s system, an oil change was performed. Codes were cleared and the car was test driven. The fault codes did not return and the engine started up normally without any abnormal rattling sounds.

I decided to keep the car for a few days to do an extended test drive. After 140 miles of perfect operation, while merging onto a highway, the car went into limp mode and displayed a severe lack of power at high RPM's. I made it back to the shop and found a P000277 and P061A22. After some research and testing, it appears that the high pressure fuel pump decided to fail. This is not an uncommon issue with these engines, either. I will make a separate thread for that repair.

This car is currently for sale in case anyone is interested: https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5154182/fs-2012-mercedes-benz-c250-sport

- The Critic
Posted By: BMWTurboDzl

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 11:11 AM

Good read !

These cam phasers seem to impact a variety of Benz engines of that era all the way up to the V8/V12's.
Posted By: IndyIan

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 12:01 PM

Thanks for posting this, its always interesting to see a job well done. My first thought was that this level of parts quality, sounds more like a chinese knock off car than an MB... But I guess they all make the odd car with issues.
Posted By: Chris142

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 12:04 PM

Your braver than me!
Posted By: atikovi

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 12:12 PM

Perfect example of why the values of these cars drop like a rock after the warranty expires. Not sure I'd list it for sale until you get it fixed. What do you tell someone when they want to come look at it now?
Posted By: ragtoplvr

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 12:24 PM

Having had the cam phasers and high pressure fuel pump already is a good selling point. The used value should go up significantly.

Rod
Posted By: atikovi

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 12:48 PM

You would think, but most of the people looking at buying this car don't even know how to check the oil. They have no idea what cam phaser is.
Posted By: KGMtech

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 01:26 PM

low miles for such an expensive repair!
Posted By: ragtoplvr

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 03:06 PM

Originally Posted by KGMtech
low miles for such an expensive repair!


This is all in my humble opinion.
This so somewhat typical of a European car. They tend to use bio degradeable plastic, so plastic things crumbling is quite common. I wonder what is the condition of the wire harness, another frightfully expensive repair. They tend to over engineer (very reduced safety margin for wear and overly small parts)
The days of the MB designed to last for 500K miles with minimum repairs is gone. You should see what my neighbor has gone thru on his MB. He s correct, they do drive very very nice. Until they strand you. Oh and if you hit one, you better have good insurance.

Rod
Posted By: BMWTurboDzl

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 04:11 PM

Originally Posted by ragtoplvr
Originally Posted by KGMtech
low miles for such an expensive repair!


This is all in my humble opinion.
This so somewhat typical of a European car. They tend to use bio degradeable plastic, so plastic things crumbling is quite common. I wonder what is the condition of the wire harness, another frightfully expensive repair. They tend to over engineer (very reduced safety margin for wear and overly small parts)
The days of the MB designed to last for 500K miles with minimum repairs is gone. You should see what my neighbor has gone thru on his MB. He s correct, they do drive very very nice. Until they strand you. Oh and if you hit one, you better have good insurance.

Rod

EU Directive for end-of life vehicles.
Posted By: Sunnyinhollister

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 04:54 PM

Good read.

86K miles, looks to be maintained, and needs over $2k in parts plus labor. They are nice cars but the pay to play price is too high for me.
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 05:02 PM

Originally Posted by atikovi
Perfect example of why the values of these cars drop like a rock after the warranty expires. Not sure I'd list it for sale until you get it fixed. What do you tell someone when they want to come look at it now?

I'll be transparent.

Originally Posted by Sunnyinhollister
Good read.

86K miles, looks to be maintained, and needs over $2k in parts plus labor. They are nice cars but the pay to play price is too high for me.

The HPFP was another $450 so I think we have ~$2250 into it at this point.
Posted By: Smokescreen

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 05:03 PM

coffee

Ill just stick with my low tech American iron and my reliable Japanese commuter...
Posted By: AC1DD

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 05:21 PM

Originally Posted by ragtoplvr
[quote=KGMtech]
The days of the MB designed to last for 500K miles with minimum repairs is gone. You should see what my neighbor has gone thru on his MB. He s correct, they do drive very very nice. Until they strand you. Oh and if you hit one, you better have good insurance.

Rod



Exactly, that old reputation is finally dead in the minds of most consumers today. That's why increasingly these former iconic car makers are in serious trouble.
Their entire reason to exist is virtually gone.
Posted By: Chris Meutsch

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 05:39 PM

What a nightmare.......

Good on you, Critic, for tackling the (nonsensically) hard repairs and posting your findings! Always good reads.
Posted By: PimTac

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 05:53 PM

Was there any indication that the oil had not been changed regularly during the cars life prior to this?

Another sign that MB quality is not what it used to be.
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 06:29 PM

Originally Posted by PimTac
Was there any indication that the oil had not been changed regularly during the cars life prior to this?

Another sign that MB quality is not what it used to be.

The top of the engine looks okay but does have some light varnish. It was a rental for the first part of its life, then after that it was dealer-serviced at the correct intervals before the current owner purchased it.
Posted By: OVERKILL

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 06:38 PM

Holy crap, that's an expensive service for such low mileage crzy and your price was a bargain compared to the dealer.
Posted By: JeffKeryk

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 08:16 PM

Michael is so good I am gonna have him do the oil change services on our Model 3.
No one else!
Posted By: ford46guy

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/08/19 08:38 PM

86K wow
I really appreciate my Lexus now. I never heard of a phaser/timing failure on the forum. That job is at least 4k at an indy.
Now a HPFP frown. What was the mode of failure? Sometimes they die because of extended OCIs and the cam wearing down. Maybe the first problem was due to that too.
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/09/19 01:22 AM

Originally Posted by ford46guy
86K wow
I really appreciate my Lexus now. I never heard of a phaser/timing failure on the forum. That job is at least 4k at an indy.
Now a HPFP frown. What was the mode of failure? Sometimes they die because of extended OCIs and the cam wearing down. Maybe the first problem was due to that too.

I am not sure. But the HPFP has a $70 core charge so I probably should not take it apart.

This particular HPFP design does not use a cam follower and the cam's are usually not an issue.
Posted By: antonmnster

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/09/19 03:02 AM

My n54 cam phasers are $80 and take 20 minutes. They're the only thing easy about that engine.
Posted By: PandaBear

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/09/19 05:23 PM

How can these parts wear out so soon? Did they skip the heat treatment so they can save $10? It's almost like they design everything in CAD and have only 1% safety margin past warranty.

The way the intake is routed I'm not surprised the hose crumble, and the wiring harness between 2 ignition coils.... Mitsubishi would be proud (at least the 2nd gen Eclipses was priced fairly).

It's sad to see the 3 point star on such a piece of engineering.

Posted By: MCompact

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/09/19 05:31 PM

Originally Posted by Smokescreen
coffee

Ill just stick with my low tech American iron and my reliable Japanese commuter...


Awesome; if only I had done the same...


Posted By: 2004tdigls

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/09/19 07:30 PM

Originally Posted by PandaBear
How can these parts wear out so soon? Did they skip the heat treatment so they can save $10? It's almost like they design everything in CAD and have only 1% safety margin past warranty.

The way the intake is routed I'm not surprised the hose crumble, and the wiring harness between 2 ignition coils.... Mitsubishi would be proud (at least the 2nd gen Eclipses was priced fairly).

It's sad to see the 3 point star on such a piece of engineering.



The explanation is pretty simple, my neighbour is the head mechanic at Vancouver Mercedes, PM me for his name and email if you like.

Mercedes, BMW and VW among others have decided to make their cars "maintenance free", with 30, 000 km oil changes on the Sprinters, never change transmission and differential oils on virtually all models, and up to 20, 000 km OCI on other cars.

The concept is simple, most cars are leased, so the "owner" does three or four oil changes and trades the car in, by which time in the opinion of my neighbour the engines, particularly the in the Sprinters , are "done". The car usually has 10-20 km of warranty left to make the vehicle marketable as a "factory maintained used car"

He drives a new B250 turbo and changes the oil every 6 months or 8000 km, less than half what Mercedes sees as required. In his opinion if you do this the engines should last "forever"

I do the same with my 2001 ML and i use a hdeo 15w40, the engine uses 1/2 liter every oil change
Posted By: BMWTurboDzl

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/10/19 12:47 PM

Originally Posted by antonmnster
My n54 cam phasers are $80 and take 20 minutes. They're the only thing easy about that engine.


Are you thinking of the cam position sensor or solenoid sensor? The eccentric shaft actuator is about (OE)$200 or $400 (Genuine BMW) and a PITA.

Originally Posted by PandaBear
How can these parts wear out so soon? Did they skip the heat treatment so they can save $10? It's almost like they design everything in CAD and have only 1% safety margin past warranty.

The way the intake is routed I'm not surprised the hose crumble, and the wiring harness between 2 ignition coils.... Mitsubishi would be proud (at least the 2nd gen Eclipses was priced fairly).

It's sad to see the 3 point star on such a piece of engineering.



I wonder if automakers have to re-design a part just to avoid infringing on patents of other automakers and consequently sometimes the unique design is just inherently compromised.
Posted By: ecotourist

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/13/19 08:14 PM

Originally Posted by 2004tdigls
.... my neighbour is the head mechanic at Vancouver Mercedes ....

He drives a new B250 turbo and changes the oil every 6 months or 8000 km, less than half what Mercedes sees as required. In his opinion if you do this the engines should last "forever".

The former head mechanic at a BMW dealership in Edmonton advised me to do something very similar. Change the engine oil at half the interval suggested by the oil life monitor. (You change the oil but don't touch the monitor which keeps the other maintenance recommendations at the correct interval).

It turns out his wife drives (or drove anyway) the same BMW as I do - which he described as one of BMW's more reliable recent products. I took that family connection as an endorsement of my 528i ownership. [Kind of like a physician saying, "if it were me, this is what I would do".]
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 07/15/19 09:45 AM

Originally Posted by 2004tdigls
Originally Posted by PandaBear
How can these parts wear out so soon? Did they skip the heat treatment so they can save $10? It's almost like they design everything in CAD and have only 1% safety margin past warranty.

The way the intake is routed I'm not surprised the hose crumble, and the wiring harness between 2 ignition coils.... Mitsubishi would be proud (at least the 2nd gen Eclipses was priced fairly).

It's sad to see the 3 point star on such a piece of engineering.



The explanation is pretty simple, my neighbour is the head mechanic at Vancouver Mercedes, PM me for his name and email if you like.

Mercedes, BMW and VW among others have decided to make their cars "maintenance free", with 30, 000 km oil changes on the Sprinters, never change transmission and differential oils on virtually all models, and up to 20, 000 km OCI on other cars.

The concept is simple, most cars are leased, so the "owner" does three or four oil changes and trades the car in, by which time in the opinion of my neighbour the engines, particularly the in the Sprinters , are "done". The car usually has 10-20 km of warranty left to make the vehicle marketable as a "factory maintained used car"

He drives a new B250 turbo and changes the oil every 6 months or 8000 km, less than half what Mercedes sees as required. In his opinion if you do this the engines should last "forever"

I do the same with my 2001 ML and i use a hdeo 15w40, the engine uses 1/2 liter every oil change

More frequent oil changes would probably help with timing chain wear, but I doubt it would have any effect on the lifespan of the cam adjusters. The mechanism which fails is internal to the adjuster.
Posted By: rjkoop

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 08/13/19 08:42 PM

Great write up! Hard to find this info elsewhere.

Richard
Posted By: RayCJ

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 08/14/19 12:21 AM


Good post, good engine porn -and most of all, good work. Wish we had a "Thumbs-up" button.

.... Funny, in another thread, some guy dropped in and said we all need to stop changing our oil so often. -And in this thread, the message being driven-home, is to change it at half the recommended interval. Looks like one size does not fit all...

Extended OCI... Maybe some folks like to go there but, an OC cost me under 30 bucks, an oil analysis cost 30 bucks... A top-side engine repair will cost at least $1500. In my view of the world, I'll stick to changing the oil 2x a year and doing a UOA once every year or two.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/20/19 11:45 PM

What is the best available "Cam Adjusters" part number for this m271 turbo ??

We have;
2710501400 / 2710501500 New
271050140080 / 271050150080 Rebuilt
2710503347 / 2710503447

And who is a trusted source??

aftermarket brand ??
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/20/19 11:55 PM

Originally Posted by GeraldT
What is the best available "Cam Adjusters" part number for this m271 turbo ??

We have;
2710501400 / 2710501500 New
271050140080 / 271050150080 Rebuilt
2710503347 / 2710503447

And who is a trusted source??

aftermarket brand ??


“Best available” would be the latest re-manufactured ones from MB. The latest revisions are supposedly much more reliable.

The aftermarket Chinese adjusters are ridiculously inexpensive so I would be extremely suspicious.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/21/19 12:20 AM

Here are the prices

2710501400 / 2710501500 New on ebay for $489.99 for the set of two.

271050140080 / 271050150080 Rebuilt. $537.98 plus $586.92 equals a total of $1124.90 from mboemparts.com

2710503347 / 2710503447 Cheap, although the latest part number. Also have not seen in Genuine Mercedes box with this P/N, only the 400 and 500.

So rebuilt is better then new ??

Rebuilt's are also the most expensive!!
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/21/19 12:31 AM

Originally Posted by GeraldT
Here are the prices

2710501400 / 2710501500 New on ebay for $489.99 for the set of two.

271050140080 / 271050150080 Rebuilt. $537.98 plus $586.92 equals a total of $1124.90 from mboemparts.com

2710503347 / 2710503447 Cheap, although the latest part number. Also have not seen in Genuine Mercedes box with this P/N, only the 400 and 500.

So rebuilt is better then new ??

Rebuilt's are also the most expensive!!

Rebuilt is the ONLY current option from MB. MB has not made new cam adjusters for this application for years, so any new ones you see are of an older revision (old stock) and should be avoided. The latest reman adjusters from MB are the most reliable ones available.

You will also need the cam hold-down tool and the T100 socket. I can sell you mine if you are interested.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/21/19 12:32 AM

At what section of the 2710902029 pipe did it fail ?
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/21/19 12:39 AM

Originally Posted by The Critic
Originally Posted by GeraldT
Here are the prices

2710501400 / 2710501500 New on ebay for $489.99 for the set of two.

271050140080 / 271050150080 Rebuilt. $537.98 plus $586.92 equals a total of $1124.90 from mboemparts.com

2710503347 / 2710503447 Cheap, although the latest part number. Also have not seen in Genuine Mercedes box with this P/N, only the 400 and 500.

So rebuilt is better then new ??

Rebuilt's are also the most expensive!!

Rebuilt is the ONLY current option from MB. MB has not made new cam adjusters for this application for years, so any new ones you see are of an older revision (old stock) and should be avoided. The latest reman adjusters from MB are the most reliable ones available.

You will also need the cam hold-down tool and the T100 socket. I can sell you mine if you are interested.


Super, I think I now understand that the rebuilt ones are the most reliable ones. Thanks you have been a great help.

My car, SLK250 was rattles when coasting in gear with the engine hot, (It has done this for 3 oil change periods, shop only had the 0w oil), I changed the oil to 10W-30 and that has resolved the noise so far. Engine has 44K miles.

What do you advise ??
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/21/19 02:37 AM

Originally Posted by GeraldT
At what section of the 2710902029 pipe did it fail ?

About halfway down, near the pressure sensor. The pipe was very brittle.

Failed cam adjusters will rattle during start up and cause a fault code. If it is rattling while the engine is running, you probably need a new timing chain. If yours is a 2012 or 13, you should consider installing all new updated components. Keep in mind that you also need a special tool to install the chain; you have to break the link and draw the chain thru the timing chain case.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/21/19 11:14 PM

There is a tool that I can install in where the Tensioner mounts, and it will give me a reading of the overall wear on the Chain and Rails.

Febi 40125
Mercedes # 271 589 07 63 00

https://media.carooline.com/media/0151_DOC/SWAGSOLU40125_GB.PDF
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 05:40 AM

Originally Posted by GeraldT
There is a tool that I can install in where the Tensioner mounts, and it will give me a reading of the overall wear on the Chain and Rails.

Febi 40125
Mercedes # 271 589 07 63 00

https://media.carooline.com/media/0151_DOC/SWAGSOLU40125_GB.PDF

That tool costs almost as much as the chain itself.

Also, you have to unscrew the chain tensioner to install the tool. The chain tensioner on the 271evo engine is one-time use and is different than the tensioner used on the early 271 engines.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 05:43 AM

There are a couple of youtube videos showing how to reset the 271evo tensioner, so that it can be used again. The tool is for this later style tensioner.
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 05:46 AM

Originally Posted by GeraldT
There are a couple of youtube videos showing how to reset the 271evo tensioner, so that it can be used again. The tool is for this later style tensioner.

I have seen the videos, but the official service procedure warns against resetting the tensioner. On a private forum I am part of, there have been a few reports of tensioner malfunction after the tensioner was reset and reused.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 12:13 PM

Originally Posted by The Critic
there have been a few reports of tensioner malfunction after the tensioner was reset and reused.


WOW, that is not good.

So with so many brands, and a wide range of prices, which source for a tensioner do you recommend ?

Thanks
Posted By: WyrTwister

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 01:10 PM

I have heard German vehicles can / do become money pits when it comes to repairs & parts . Sounds like this is an example .

For sale ? No thanks , think I will pass .

Best of luck to you , :-)
Wyr
God bless
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 01:32 PM

Originally Posted by GeraldT
Originally Posted by The Critic
there have been a few reports of tensioner malfunction after the tensioner was reset and reused.


WOW, that is not good.

So with so many brands, and a wide range of prices, which source for a tensioner do you recommend ?

Thanks

Dealer. And you will also need the tensioner plug.

If you plan to do the job, order all of the parts on my list (Except the intake tube) plus the chain and both special service tools. You will need them.

However, since you are only hearing a rattle and are not experiencing any faults, diagnose the issue before proceeding with repairs.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 05:25 PM

Ordered Tensioner, a used wear measuring (Febi 40125) tool and as life would have it a replacement alternator (Parasitic battery drain, intermittent)

I have not heard the noise since going to 10W-30 oil, Yesterday I just changed the oil again with 5W-40 and still no noise.

I will get a baseline of the amount of chain, gears ?, and rail wear, before proceeding further.

Super grateful for all your assistance !!
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 06:29 PM

Originally Posted by GeraldT
Ordered Tensioner, a used wear measuring (Febi 40125) tool and as life would have it a replacement alternator (Parasitic battery drain, intermittent)

I have not heard the noise since going to 10W-30 oil, Yesterday I just changed the oil again with 5W-40 and still no noise.

I will get a baseline of the amount of chain, gears ?, and rail wear, before proceeding further.

Super grateful for all your assistance !!

Also need to order a timing chain tensioner hole plug. You need to destroy the current one in order to remove it. Part # 000-997-62-20, about $6.

Where did you purchase the tool from?
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/22/19 07:03 PM

Originally Posted by The Critic
Where did you purchase the tool from?


Used on Ebay from Riga, Latvia
Posted By: CMAMerc

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/24/19 02:17 AM

Working on my 2014 C250 Sport with the inevitable chain rattle. Had a few questions I was wondering if anyone could answer. First, I had a local shop recommend replacing the VVT Oil Control Valves (271-050-05-78) but they are the only people who have recommended this. Is this needed or can the old ones be reused? Also, for the valve cover does anyone know the torque specs for the bolts? Lastly, for the valve cover again, does the valve cover need sealant and if so what's the best method for application. Apologies if these are no brainers, just a few things I have missed in my research for this repair.
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/24/19 08:15 AM

Originally Posted by CMAMerc
Working on my 2014 C250 Sport with the inevitable chain rattle. Had a few questions I was wondering if anyone could answer. First, I had a local shop recommend replacing the VVT Oil Control Valves (271-050-05-78) but they are the only people who have recommended this. Is this needed or can the old ones be reused? Also, for the valve cover does anyone know the torque specs for the bolts? Lastly, for the valve cover again, does the valve cover need sealant and if so what's the best method for application. Apologies if these are no brainers, just a few things I have missed in my research for this repair.

The oil control valves are in the center of each cam adjuster. During cam adjuster removal, they can be prone to damage and any debris in the valve will cause issues. Replacing them is not a bad idea, but this adds substantial cost. I re-used mine.

The valve cover requires sealant in the two seams where the timing cover meets the head. I do not remember the torque spec off hand, but it is low.
Posted By: MCompact

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/24/19 03:07 PM

Originally Posted by WyrTwister
I have heard German vehicles can / do become money pits when it comes to repairs & parts . Sounds like this is an example .

For sale ? No thanks , think I will pass .

Best of luck to you , :-)
Wyr
God bless


Thank you for yet another astute and perceptive observation; I’m sure that the OP and others will find it extremely helpful.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/24/19 03:23 PM

Wife had VW TDI injector pump changed twice by the dealer under warranty and beyond warranty (Past 100K). Then VW bought the car back.

Then on her Honda, they replaced the transmission twice, beyond the warranty...

On my first 1998 Mercedes, NOTHING broke, Now with my 2012 Mercedes, the dealer will not cover anything, and I have a long list of failed items. It is sad. Someone needs to sign people up for a class action, do to how the current Mercedes break...
Posted By: CMAMerc

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/25/19 03:55 AM

Thank you so much, really appreciate the help. One more question if you have a second. When replacing the timing tensioner, do you just need to tighten in the new one? Or is there a specific process to engage it since it comes depressed and it needs to expand.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/26/19 02:16 AM

Originally Posted by The Critic
Originally Posted by GeraldT
At what section of the 2710902029 pipe did it fail ?

About halfway down, near the pressure sensor. The pipe was very brittle.


Tornado Tuning makes an Aluminium Intake Pipe to replace the plastic pipe that comes stock.

https://www.fonefunshop.com/special...pipe.html#product-details-tab-How_To_Buy
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/26/19 04:58 AM

Originally Posted by CMAMerc
Thank you so much, really appreciate the help. One more question if you have a second. When replacing the timing tensioner, do you just need to tighten in the new one? Or is there a specific process to engage it since it comes depressed and it needs to expand.

After torquing the tensioner, you will need to install a new one-time use tensioner plug. The tensioner gets unlocked in a manner that is similar to the Toyota tensioners: you turn the crank CCW slightly, then rotate the crank pulley clockwise until you hear the ratcheting mechanism unwind.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/26/19 08:35 PM

This is supposed to be a picture of the inside part of the Cam Adjusters that goes bad...

Old and new

Attached picture damaged hole 2.jpg
Attached picture new2.jpg
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/27/19 01:26 AM

Russian video showing a rebuild of Cam Adjuster with hardened center plate.

https://www.youtube.com/watch?v=18_2gx2Z2R4

Google translate;

8 903 534 10 02
CALL
COUPLING CAMSHAFT INLET AND OUTLET Kit for Mercedes Motor 271 Turbo EVO
A 271 050 14 00
A 271 050 15 00
-------------------------------------------------- ---------------------------
Timing camshaft clutch on an M271.8 evo 271.820 271.860 engine.
Moscow development, factory production in German equipment.
THIS IS NOT CHINA = NOT TURKEY = NOT YTM = NOT RUEL = NOT RESTORED ON THE KNEE == FACTORY QUALITY!
==================== ATTENTION! ========================
We fixed the 271th clutch in the likeness of the clutch on the 274th-278th motors that rarely fail and work on 200t.km — we used the same alloy and the same production technologies !!!!
All necessary tests have been carried out. The internal mechanism is modernized - the metal is reinforced to 60 units. and the surface is "cemented." In these couplings, the teeth do not wear out, in them the internal mechanism fails. Do not confuse with the compressor option! Therefore, there is no way to check this in used couplings.
EXCHANGE WARRANTY-360 days! "
Suitable for all 271 turbo engines 2007-2013 onwards
Resource from 90 to 200 thousand km, subject to timely maintenance !!!!!
For comparison:
The resource of the original ~ 45-90 thousand km
The resource of the original with a brewed mechanism less than 1000km.
Second-hand resource of the original ~ 1-2tys.km.
Resource of Chinese \ Taiwan \ Turkish analogues ~ 0.km
Each coupling is configured on a test bench.
Write.
There is WhatsApp, Viber.
=================================================== =
We give a guarantee without a mileage limit - 12 months!
12 months exchange
=================================================== ==
(Attention! -New original numbers!)
A2710501400
A2710501500
(ATTENTION! -Old numbers are different!)
A2710503347
A2710503447
A2710502547
A2710502647
A2710501400
A2710501500
===================================================
271 Turbo engines are suitable for Mercedes S, E, Coupe and other classes of different generations and years: since 2010!
==============================================
The price is per unit.
Terms of delivery: only for exchange (first your old to us, or on bail).
-------------------------------------------------- ---------------------------------
SENDING TO REGIONS = Business Lines or SDEK
=================================================== ===
We work on weekends!
8 903 534 10 02
CALL-ask-ANSWER!

WE BUY OLD MERCEDES COUPLINGS!
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/27/19 03:15 PM

The issue with the M271 turbo cam adjusters appears to be wear internal of the cam adjusters. Between 45K and 90K miles on the M271 cam adjusters, the plates have a groove worn in them by the pin. The pin is designed to lock the cam at idle and low power, and unlock with oil pressure to in order to change the cam timing for power. The rattle sound is the cam adjuster pins moving in the worn slot of the plate, this slapping motion of the adjuster causes the chain to stretch, and of coarse creates noise.

There is a Russian source for hardened plates, which have double the life...

So on the M271 turbo, in my opinion the cam adjuster are a required replacement item when doing a timing chain. Don't assume that they are fine, just because they look fine. Slop in the cam adjuster from wear in the plate should be able to be measured, with the cams locked by the cam holding tool. and with the chain removed, the slop or play should be able to be observed by simply trying to rotate the cam adjuster by hand.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/31/19 06:34 PM

Source of the timing chain and cam adjuster problems...

Translated from Russian website
gesha from; https://www.benzclub.ru/forum/showpo...postcount=1026

checking the ventilation valve at partial loads -
checking the software -
checking the thermostat -
changing oil with a viscosity of 5W50 from tolerance sheet 229.3

and then,

sranjesuper from; https://mbworld.org/forums/c-class-w...ml#post7536221

"And here is the best part, which is why THE CHAINS FAIL. Which is what nobody has mentioned yet.


The vacuum hose underneath the intake, that routes PCV gases from the crank case to your intake.

Mine was not only blocked, causing the gases and fuel vapours to REMAIN in the crankcase mixed with OIL, but it also had a hole in the vacuum tube itself, near the intake side, causing about 15% loss of power and and boost. So basically with a blocked PCV, you have extra gas that's running down your cylinder walls, mixing with your engine oil that is supposed to lubricate your chain. Gas eats the oils lubricating properties, and your chain slowly grinds away.

During those few weeks that i drove, not knowing why my car feels slow, i noticed more CHAIN RATTLE during start ups. I was determinted to find this issue and believe it was a boost leak. I took my air filter housing off, and looked through a opening in the intake manifold, and saw a tube, that was covered in oil. So I knew oil was coming from somewhere and i saw also a small tiny pinhole in the vacuum tube itself, confirming where my boost leak is coming from. Once i took out the vacuum tube, i tried shaking it, to hear if the PCV valve is moving inside.. Nope, it was stuck...


As soon as i fixed this vacuum tube, which was also something like $170 CDN for a piece of plastic tube and a valve , and did my oil change, my car doesn't have a rattle anymore, and got my full boost back.. So hopefully my chain will not have this issue, unless i already damaged it a bit...."




So on my 2012 SLK250

Oil smells of gasoline.
Updated software on fuel pump in the tank.
Previously changed the thermostat, I will have to measure temperature again.
Had a rattle noise that went away, after replacing oil, currently running 5W-40 Liqui Molly, which is MB 229.5

So today I decided to check crankcase vent, simple procedure is disconnect 90 degree rubber elbow at throttle and see is there is flow out but not in. (Suck and blow)

Clogged solid, all the problems with chains and cam adjuster, because of 271-018-07-29 valve, which is $23.00 (Amazon)
People on the Russian forum are keeping a spare valve and changing it out at each oil change. The valve is bolted to the engine just about the left engine mount. I maybe able to remove from the bottom ??? Today I removed with the intake manifold...
One person commented that a new valve clogged solid by the third oil change.
Posted By: GeraldT

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 10/31/19 07:40 PM

How to verify that the cam adjuster need replacing, trick to see hidden damage

https://youtu.be/-6CPrIATc10
https://youtu.be/2YyFhVOpwrs

Can be done by removing spark plugs and Cam Adjuster magnets (Valve cover still on...
Posted By: CMAMerc

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 11/13/19 04:17 AM

Hi all, have a few questions. I am in the middle of this project and have hit a road block. I have installed the new cam adjusters but they do not seem to be lining up. I have attached a few pictures to show this. When initially placing the holding tool, it had a hard time locking down. After putting the new cam adjusters (both intake and exhaust) the tool fell right into place. With this though, the middle ring and the cam adjuster are not in alignment with the top mark. I have not put the new tensioner in as I wanted to see if I was missing something. I marked the chain before removing the old adjusters but it almost looks like I need to shift the chain over a link on both the intake and exhaust. Thoughts on proceed? Secondly, when removing the old thermostat the spring portion snapped off in the timing cover, any ideas how to remove that? Thanks again for the help. [Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 11/13/19 07:01 AM

Originally Posted by CMAMerc
Hi all, have a few questions. I am in the middle of this project and have hit a road block. I have installed the new cam adjusters but they do not seem to be lining up. I have attached a few pictures to show this. When initially placing the holding tool, it had a hard time locking down. After putting the new cam adjusters (both intake and exhaust) the tool fell right into place. With this though, the middle ring and the cam adjuster are not in alignment with the top mark. I have not put the new tensioner in as I wanted to see if I was missing something. I marked the chain before removing the old adjusters but it almost looks like I need to shift the chain over a link on both the intake and exhaust. Thoughts on proceed? Secondly, when removing the old thermostat the spring portion snapped off in the timing cover, any ideas how to remove that? Thanks again for the help. [Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

Those marks look passable as long as the crank is at 0-deg TDC. If the tool fits, you should be in good shape. The crank pulley will “freewheel” when the tensioner is our, so keep that in mind. Take a look at the marks that I posted in the beginning of the thread.

The marks will never line up 100% perfect, especially if you reuse the timing chain.

For the thermostat, I guess you’ll either have to pull the cover back off or find a way to knock the thermostat out of there.
Posted By: CMAMerc

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 11/14/19 12:45 AM

Okay, thanks so much. The crank did freewheeled slightly (tensioner is still out), caught it at about 3 marks off center, brought it back to center but wondering if that has messed anything up or if I’m still okay because the tensioner was out and the holding tool was still in place.
Posted By: CMAMerc

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 11/14/19 03:42 AM

The other question I meant to ask is in your original post you mentioned the middle mark being off. Is this something we need to manually move back (is it love able?) or should it have moved back to center in its own. Reason being mine was advanced on the intake and did not move back on it’s own so wondering if I missed that.
Posted By: The Critic

Re: 2012 Mercedes-Benz C250 1.8L TGDI - P034062 - Cam Adjuster Repair - 11/14/19 06:35 AM

Originally Posted by CMAMerc
The other question I meant to ask is in your original post you mentioned the middle mark being off. Is this something we need to manually move back (is it love able?) or should it have moved back to center in its own. Reason being mine was advanced on the intake and did not move back on it’s own so wondering if I missed that.

If the tool fits, it will probably be passable.
The marks on the adjuster are not lining up due to chain stretch.
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