The Complete M272 Engine Thread

[Deleted member 2227]

Following on from my Complete M271 Engine thread please feel free to add resources to this thread for the M272 Engine.

Mercedes-Benz M272 engine
Mainly from Wikipedia, the free encyclopedia but added to:

Technical brief: 76 pages!
http://www.mercedestechstore.com/pdfs/287_R171/287 HO 03 M272 (FAH) 08-05-04.pdf

The Mercedes-Benz M272 engine is a V6 automobile piston engine family used in the 2000s (decade). Introduced in 2004, it is based on the M112 V6 introduced in 1998.
All M272 engines have aluminum engine blocks with a 90° vee angle with silicon/aluminum lined cylinders. The aluminum DOHC cylinder heads have 4 valves per cylinder. Direct injection is used in a limited fashion on the 3.5 L V6, whereas others use conventional port fuel injection. All have forged steel connecting rods, one-piece cast camshafts, iron-coated aluminum pistons and a magnesium intake manifold. Like the M112, a balancer shaft is installed in the engine block between the cylinder banks to deal with vibrations in the 90 degree V6 design. This essentially eliminates first and second order moments. A dual-length Variable Length Intake Manifold is fitted to optimise engine flexibility.
Continuous VVT was adopted for the first time. Featured on both the intake and exhaust camshafts, each can be varied through a range of 40 degrees. The twin spark plug system was replaced by a regular single spark plug per cylinder. New electronic coolant flow control has replaced the mechanical thermostat for improved engine warm-up and optimum control of engine temperature. Also tumble flaps are used to improve output at low engine speeds.

E25
The E25 is a 2.5 L (2496 cc) version. Bore dimension is 88 mm and stroke is 68.4 mm. Output is 204 PS (201 hp/150 kW) at 6100 rpm with 181 ft•lbf (245 N•m) of torque at 2900-5500 rpm.
Applications:
• 2005–present C230 (renamed C250 in 2010)
• 2005–2009 E230
• 2008–present CLC230
E30
The E30 is a 3.0 L (2996 cc) version. Bore is 88 mm and stroke is up to 82 mm. Output is 231 PS (228 hp/170 kW) at 6000 rpm with 221 ft•lbf (300 N•m) of torque at 2500-5000 rpm.
Applications:
• 2004–present SLK280
• 2005–present CLS280
• 2005–present CLK280
• 2005–present C280 (C300 in 2008)
• 2005–present E280 (E300 in 2007)
• 2005–present SL280
• 2006–present R280
• 2007–present S280
E35
The E35 is a 3.5 L (3498 cc) version. Bore dimension is 92.6 mm and stroke is 86 mm. Output is 272 PS (268 hp/200 kW) at 6000 rpm with 258 ft•lbf (350 N•m) of torque at 3500 rpm. A direct injected variant debuted in 2006 under the name Stratified-Charged Gasoline Injection (CGI). First fitted to the CLS350 CGI, it produces 292 PS (288 hp/215 kW) and 269 ft•lbf (365 N•m) of torque while lowering fuel consumption. In 2008, the non-CGI engine was uprated to 316 PS (232 kW) at 6500 rpm and 265 ft•lbf (360 N•m) of torque at 4900 rpm. This was achieved by raising the rev-limit to 7200 rpm, increasing the compression ratio and other modifications to the valvetrain.
Applications:
• 2004–present SLK350
• 2004–present CLS350
• 2005–present CLK350
• 2005–present C350
• 2005–present E350
• 2005–present S350
• 2005–present SL350
• 2006–present R350
• 2006–present ML350
• 2005–present Viano
• 2006–present Sprinter
• 2008–present CLC350
• 2008–present GLK350

The M272 Engine, ulike the M271, is highly tuneable and a huge array of tuning options exist. these include:

4.0 litre bore out

Brabus - Tuning for Mercedes-Benz

Plus 60bhp

Brabus B7 kit

http://www.brabus.com/en/deliver.php?id=6138&filename=W204 B7.EN.pdf

Change Cats and Exhaust for 15bhp….

Kleemann - Tuning for the 350 (M272) V6 engine.

Kit 1 ECU 305bhp
Kit 2 K1 plus headers and downpipes 320bhp
Kit 3 K1 + K2 plus Camshafts = 340bhp

http://www.avl-schrick.com/dat/MK/Schrick 2011 E.pdf

Schrick Camshafts

MKB - Products

MKB ECU tune =306bhp
Plus cams and manifold =330bhp


http://carlsson.de/b2b/index.php?autoload=0&func=browse&mfid=1&tid=40&vid=-1&cat=18

295bhp from changing exhaust and airfilter and ecu…..


VATH Performance Kit V35RS for Mercedes Benz C350 and C350 (w204) - FierceSpeed

Vath 321bhp for $8100

PLEASE ADD RESOURCES AND COMMENTS BUT ONLY ABOUT THE M272!

 

[Deleted member 2227]

There has been much written about the Balancer Shaft issue on this engine.
This bulletin explains much.

http://mbworld.org/wiki/images/0/0b/Mercedes_M272_balance_shaft_service_bulletin.pdf


engines up to #2729..30 468933 -- this when the gear is the problem

engines up to #2729..30 759427 -- this when the adjustment solenoids are the problem

engines up to #2729..30 895140 -- this when the adjustment solenoids leak oil

The first two scenarios cause "check engine light", the third is just an oil leak.

 

[clk208]

^ Very useful, thanks!

I'm beyond the first category being 30 512... but supplying MB dealer in diagnosis said I had the gear problem (but weren't keen on fixing it under warranty, once they realised I bought it from them and it was still under AU warranty). Subsequent diagnosis plus visit to another dealer said cam sensors faulty so hopefully they were just wrong first time round.

Time will tell I guess but above is reassuring..

 

[Deleted member 2227]

Ooh that looks nice!

 

[oscarisapc]

This is a really good and useful thread so many thanks R2D2. I have been looking to buy a 3.5SL R230 until my wife objected to only two seats (really?) on the grounds that the rest of the family couldn't get in. So it is now a 3.5 W209CLK I am interested in instead. However, being completely non-mechanical, for which I compensate by paying those guys who do understand engines to do the work for me, where do I find the M272 engine serial number to check it? I assume it is not part of the VIN number.

 

[grober]

This is a really good and useful thread so many thanks R2D2. I have been looking to buy a 3.5SL R230 until my wife objected to only two seats (really?) on the grounds that the rest of the family couldn't get in. So it is now a 3.5 W209CLK I am interested in instead. However, being completely non-mechanical, for which I compensate by paying those guys who do understand engines to do the work for me, where do I find the M272 engine serial number to check it? I assume it is not part of the VIN number.

The engine number should be on the vehicle V5 registration document.

 

[grober]

Folks should also reference this thread by MATTYO http://www.mbclub.co.uk/forums/engine/124888-272-engine-balance-shaft-problems.html

and the BENZWorld USA mass action thread referenced:- M272 and 273 Engines: The Judge Has Spoken - Benzworld.org - Mercedes-Benz Discussion Forum

 

[Deleted member 2227]

Just thought I'd post a "British and Commonwealth" record for mpg from our beloved 3.5 V6s

PS. A minute later it went to 38.2mpg but I didn't get the proof!

 

[Deleted member 2227]

Goodwill Claim

There has been much written about the Balancer Shaft issue on this engine.
This bulletin explains much.

http://mbworld.org/wiki/images/0/0b/Mercedes_M272_balance_shaft_service_bulletin.pdf


engines up to #2729..30 468933 -- this when the gear is the problem

engines up to #2729..30 759427 -- this when the adjustment solenoids are the problem

engines up to #2729..30 895140 -- this when the adjustment solenoids leak oil

The first two scenarios cause "check engine light", the third is just an oil leak.

Just by way of an update on this most famous of MB engine issues. Issue 1 needs new balancer shafts and half a rebuild and is a costly job. Issue 2 involves replacing adjustment solenoids with modified ones which don't trip the EML light. Issue 3 requires the same part to be fitted but this time to update solenoids that otherwise leak oil.

Well my car has 40,000 miles on it and by its engine number I knew it would be an Issue 2 car if it developed a problem (which I was happy with.)

Well about the time of my last service my car had displayed the EML light a couple of times. So I was told it needed the new solenoid adjustment part which I paid for. Parts and Labour were about £90 all in. However what I didn't realise that the four different adjusters had varying amounts of labour required due to there location and that I had replaced "the easy one".

So all was well until a couple of weeks ago when the EML can on again to I run it to the dealer to capture the codes. Sure enough the other three adjusters were playing up. At this point I printed off the technical bulletin and had a discussion about a goodwill claim (my car is 5 years old and therefore out of warranty). MB came back with a 54% offer on the remaining three and so as we speak the remaining sensors are being done at a cost to me of £268 which I think is fantastic of Mercedes because the car is out of warranty. The good news is that because my car had the proper improved parts from the factory that would otherwise cause Scenario 1, the replacement of the adjusters under warranty should mean that my car is permanently fixed .....very glad for my FMBSH.

 

[clk208]

Nice result!

I'm also in the scenario 2 band with my car.

At 40k ish I had 2 sensors done. Not sure if any had been done under previous owner.

15k onwards and no issues since.

 

[Deleted member 2227]

Nice result!

I'm also in the scenario 2 band with my car.

At 40k ish I had 2 sensors done. Not sure if any had been done under previous owner.

15k onwards and no issues since.

The dealer might be able to call up the complete history and tell you if the other 2 have been done. My experience (sample of 1) would indicate that if they hadn't been done that they might have given trouble by now.

 

[clk208]

The dealer might be able to call up the complete history and tell you if the other 2 have been done. My experience (sample of 1) would indicate that if they hadn't been done that they might have given trouble by now.

You'd think so, wouldn't you?

However when the 2 were done under my ownership via tier 1 warranty they would not give me an invoice for my records. They said "of course we will" then after a couple of phone calls and 3 emails nothing appeared and I decided life was too short.

After the first sensor was replaced, the warning light was back on in a few hundred miles so when I took it for the "second" sensor they may even have replaced all 3, who knows.

I think they are reasonably accessible so one day I might have a look at the part numbers!

 

[leeV]

Hi Guys, could do with some help here,
the engine number on the car I'm about to buy is 272942 30256792

does this mean that this falls into the bracket above?

 

[Deleted member 2227]

Hi Guys, could do with some help here,
the engine number on the car I'm about to buy is 272942 30256792

does this mean that this falls into the bracket above?

Yes it's in the first category. How old is the car and how many miles has it done. Does it have a FMBSH?

 

[fortyfive]

I've just bought a 2006 SL350, engine is 272966 30 348398, so it is in the problem area. Can anyone advise whether all engines are affected, or just say 10%? Is there a UK specialist who you would recommend for early repairs before any check lights come on? Thanks 37K miles. FMBSH.

 

[Deleted member 2227]

I got mine sorted by MB 60% ish paid but I maintained my full FMBSH.

 

[fortyfive]

p.s. would a decent latest oil like Castrol Edge FST reduce the wear to increase longevity?

 

[BenzedUP]

I beat the record

 

[Deleted member 2227]

I beat the other record today. The cars going to the West End today, so high teens mpg??

 

[M271]

Great info