The Mercedes Benz OM651: Is it a good engine?
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- čas přidán 27. 07. 2024
- Seen a 2012+ Mercedes Benz 4cyl Diesel for sale, but are curious about the reliability of the engine? I hope this explains it!
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One of the best engines I've ever owned and still own. The OM651 is definitely capable of achieving 500,000kms to 1,000,000kms.
500000 kms is not very much.
@@DolphinDivingChamp ...Haha. you're hilarious. It says 500,000kms to 1,000,000kms. Plenty of taxi examples in Europe have covered this distance. If you don't think 500k KMs to 1 million KMs (300k miles to 600k miles) is a lot of mileage, you've got problems. That distance rivals the very best other reliable brands, like Toyota make.
Many Mercedes Diesels have lasted the test of time for years. 1 million KMs not enough? Try a 1976 Mercedes taxi that has 4.6 million KMs, gifted to the Mercedes Museum.
Absolutely agreed this motor is quite good and very efficient too🎉
My sprinter om651 in england i use for courier work has 591,000 thousand miles. i believe that's over 1 million kilometres for you americans
Still nothing compared to the OM646 and 647
Best OM 651 information video of all time!!!!💪
Dude you just cleared to me everything about OM 651 a thank you is worth saying for the effort❤
Thanks for the great video! I just purchased a 2021 Sprinter with the OM651 so will be excited to see your future videos. I have two relatives with W212 E250’s that seem mostly trouble free so I opted for this OM651 over the OM642.
Of course now with just 15K miles I got a CEL code P20EE so it’s at the dealer barely still under warranty. We’ll see. Best wishes on your GLK!
Thanks for the new mb diesel content!
Fantastic episode -- very helpful. Re super-fast warm air coming from the vents on cold days, I noticed the same thing about my 0m642 engine (2012 E class) but always assumed there was some electrical heating element.
You are right, there is an electric heater. These engines take round about 20km to get warm.
Best om651 vid ive seen. Especially timing chain tensioner part. Only advice i would add is use ina tensioner 4 hole feed update version. Prime it in fresh oil first by standing it nut side down press tensioner till it hydraulic locks. Then fit it. Set timing to tdc easier. Screw it in job done.
By the way, this was an awesome video! Very informative
It was also put in my 2017 Infinity Q50 with the Mercedes 7-speed gearbox. Great engine, 215bhp, 368 f/p torque.
I've gone through a few cars with the OM 651 at work over the last 10 years and had no problems to speak of! If you get the Euro 5 emissions OM 651 you don't have to deal with DEF and all these sensors. And except for a leaky waterpump or some other minor wear items no major issues. The highest mileage I had was 741000km or 460k miles and it still ran just fine. They got a really bad reputation due to problems with the injectors when they where first released, however, MB fixed that issue under warranty and switched to different injectors for later models which have been working fine ever since. I'm surprised this unit has piezo injectors, I have actually only seen them with solenoid valve injectors so far.
Great video !! and a nice efficient engine. On my GLK (rear drive, 200CDI, no adblue) - only had 2 problems: intercooler air hose (black one) - typical crack and eventual burst takes place typically after 70k miles and is easy to replace, the other one is Mass Air Flow Sensor (MAF) mulfunction - and I will attepmt to clean it myself using MAF cleaner - hopefully I'll get itback to normal operation, otherise - need to replace.
Tuned out all of the garbage and swapped in straight pipe for DPF. She runs like a champ and have driven it all over the country. One of the VERY few modern diesels I would recommend assuming you delete everything. Also have an om648 with 312k+ miles so far.
Very good video, I bought a GLK250 with 180k miles back in march. Now it has 187k miles I have replaced the intercooler hose along with the boost elbow, and the intake pipe.
my 2007 E320 bluetec had both the turbo hoses blown out shortly after i bought it loo. the rubber goes bad over time due to oil exposure.
I have a 2014 GLK250 with OM651 since new. All the issues you mentioned can be taken care of if you do the following:
1. Timing chain rattling - Change the oil with MB approved 229.31/51 oil, and change every 5K miles.
2. Water pump - Change the coolant (MB blue) every 2 years.
3. Front axle - I removed the drain plug and installed a drain valve so that I can drain and refill every 2 years. There is no fill plug there.
4. Emission & DEF - Change the AdBlue (DEF) every 2 years. I mean to evacuate the old DEF and put in new DEF. I do not buy the DEF from auto parts stores or gas stations, and I cannot afford the genuine MB AdBlue either. So I always order the VW AdBlue from VW dealer which costs me 1/3 of the Mercedes one. Again use the MB approved 229.31/51 oil to maintain the emission system. I bought the 229.31/51 oil from Walmart which costs the same as my Camry oil.
5. AGAIN Emission & DEF. No this is not a typo. I will take my OM651 for a road trip (300 miles each way) once every year to regenerate. The vehicle all of a sudden will consume more diesel than normal and pooped out what was stored. This is what is called diesel scandal. Human beings do that too when they want to fart in a public place or somewhere else.
My overall experience of ownership till now is NEVER/EVER take it to the dealership in the US for service. They may know how to work on gas cars, but definitely have no clue of a German diesel. Secondly DO NOT respond to the dealers emission recall. The MB dealership called me 6 times a day and offered me FREE emission modification and offered me $4000 cash to go there. They called me in various languages and the calls lasted about 2-3 months. Finally they gave up. Meanwhile MB sent me 2 fancy speakers with MB logos to encourage me for the recall. I know there is NO free lunch. If I would go there to get their free lunch plus cash, my GLK250 would be in a junk yard now.
I have a 2014 GLK250 with 160K miles. It's an amazing engine. Unbelievable power for a small diesel, great fuel economy and 100% reliable.
Engine is great the emission system was a pain in the butt. Twice a year a trip to the dealer for NOx sensors. Finaly gave up and the DPF fell off. No more problems.
Thank you for your excellent video. I have the same Mercedes and agree a 100% with your prediction about the emission system. Here in Canada the DEF can freeze downing the system . It was deleted 6 months ago before the Mercedes class action law suit . It was a last resort, as I had paid $ 800 each for two nox sensors. I love the engine now that I know the check engine light will not be coming on the emissions system at least! Can I get your opinion about changing the oil to a more diesel friendly [zinc] since it will no longer effect the emission system. I do my own oil changes with Pennzoil 0-W30 at 6K intervals.
Well I hope based on how many views this video got. You make more om651 content
The UK W906 sprinter had the 646 from 2007, then the 651 from 2012. The low power 646's like the 311 last as long as the vans (half million miles? million?) but the similar hp 651's tend to go bang by 250. We're comparing a euro4 and euro 5 engine though. The injectors are different between those engines (fittings and connector swapped).
Ed: Also, super annoyingly, MB changed the engine mounts and bellhousing on the 651 era engine/gboxes so they are no longer bolt compatible with the old stuff, which is lego back to some point in the 80s....
What a really helpful and interesting video.
It has given me a great overall picture of the OM651 engine.
Sadly it didn’t help me to diagnose an issue that I’m having with mine. I’m hoping you may be able to shed some light on a loud “ticking” noise I’m getting from the front/top of my engine?
I’ve changed and serviced the injectors and replaced the hydraulic valve lifters. It still makes the same noise.
The engine has done 230,000 miles and still pulls fine.
I’m reluctant to use it till I can diagnose this issue.
Any ideas before I look to pulling out the engine?
Many thanks
Only problems with these engines are:
-the owner
-2 holes chain tensioner in early models needs to be replaced with 4 hole version
-oil pressure switch solenoid needs to be removed or plugged
They really only need clean oil and coolant
I have owned a GLK250 since 2014, brand new. Never had any problem because I do all maintenance by myself since day one, no matter what the free service dealer offered me. Change oil (229.31/229.51) every 5K miles, exchange Adblue (VW DEF, not PeaK) every 2 years and coolant (Zerex G48) every 4 years including ATF (134FE) and gear oil (Castrol 75W90) and you are good to go.
Recently Mercedes keeps calling (can you imagine they called me 4 times a day?) and emailing me about the new emission update free of charge with up to $4K cash bonus to me. Mercedes also sent me 2 free Mercedes fancy speakers so that I can bring my GLK250 Bluetec in for free emission updates. This sounds too good to be true. and I declined. I know if I get this free emission update plus $4K cash, I will have bills of $40K repairs down the road, waiting for me. I will never let the Mercedes dealer in the USA touch my Mercedes DIESEL.
great to see your back , very ,very good vids, keep up the good work . youtube needs more guys like you for us D I Y ers .
My car has 210k miles. Yearly serviced since 2014. It died in a flood but I am going to rebuild it.
I would agree with the info in this video. What he can't tell you is... if you get it tuned. All you emission problem goes away. Oem has a really bad throttle lag. It can be scary sometimes. The tune will solve all those problem. Just shut off emissions. Lol. Fuel economy is amazing in my sprinter van. Unbelievable mpg
No VVT turbo on OM651 is a huge advantage to begin with in addition to the stellar fuel efficiency
I had a problem with the chain ,I changed the tensioner ,works is by hydraulic pressure and I replaced the chain guides plastics because they were broken # I advise if you have rattling noise be careful with the chain guide to prevent te damage to engine my car was about 160000 miles 🎉 I put new chain ,new tensioner guides plastic things new oil ,filter 2k was the parts and the job itself 😅
I own a 2010 sprinter with 315,000 miles on OM651
I average over 30mpg too
Hell yea, those updated return line fittings are 100 times bettter, never break when taking off, new 642s have the updated return line too.
Change engine oil and filter in every 10k mile or about 15.000 and keep the tensioners from clogging from bad lubricants.
15000 km:s
Sprinter euro 5 a651 motor tamiri yapildiktan sonra 2000 3000 rpm arasinda titreme var. Sebebi nedir ?
My OM651 has 198 000 km on it. I have done two things on it except regular maintenance. 1) Tightened the 12 (?) bolts on the valve cover. It's made of plastic an without metal inserts for the bolts. So how long will they keep the tension....it leaked quite a lot. 2) Changed the DPF diff pressure sensor. Very easy to do. I love the 2010 C-class, but of course don't like to think about all the plastic parts in there. I can only hope for the best, and keep changing the oil every 8000 km. I plan to change the transmission oil this summer. It was last changed at 60 000km. 😮😮😮
9nm ?
The timing chain at the back of the engine! What hell? I need something so simple I can easily fix myself!
After doing a couple timing chain jobs on older benz's that have the chain on the front..... I'm dropping the engine out on every other timing chain Job I'm doing. So much easier lol
@MBDieselFreak I read a few comments and if it's reliable as they some say and you have tools to deal with the problems when they arise, maybe it is not bad!
If guides break then engine needs to come out. If guides are fine some people do the chain and the tensioner from the top of engine which is much easier.
@@MBDieselFreak older benz's have normal strong chains in front that do NOT need to be replaced like these 651 chains from bicycle...
Basically 651 engine is complicated and poorly designed comparing to older generation engines
I have a 2014 E250 bluetec im gonna help some family with, we have the code that shows the switch over valve, the controller for the water pump vacuum control thing, we just ordered the special change over valve 002 540 14 97 part number, but no idea how to get to it. I have seen it done on some mercedes sprinter vans and even smart cars have this exact valve but theres some other tubes and pipes in the way. Im thinking of just loosening the clamps that hold those other tubes so i dont have to remove the ones above and around it just to get to it... If you can think of any videos showing this being done please let me know
I own a c220d 2015 with this engine and on the start in the morning I hear a rattling noise but n not every day. It happens once a week or more. I asked the guys in the shop where I do my car service and they saying is not timing chain. What could it be? Im a bit concerned
Check my channel for a video of the issue you describe. I believe the noise you are describing is the same as the one I have.
If your noise is the same, to reassure you that it’s nothing serious, I got my rocker cover removed and the gasket replaced. When this work was done the chain was checked for stretch and hardly any existed. More than likely due to me disabling start stop all the time.
The noise on mine is more than likely the hydraulic lifters and should be nothing to worry about for many 1000 more miles.
I am on 118,000 and counting, always disable start / stop as this will stretch the chain from what I heard.
Did you fix it @andyx7488?
@@legancki_vlog no. It stopped now that the weather got warmer. On the service they told it’s not timing chain. They told me to do an engine flush.
Mine was fixed by replace the tensioner only whith the upgrade one whith 4 holes , done before 5 months no more rattling , easy to replace , and not expensive.@@andyx7488
Hi I am from Sydney Australia, I have an ML250 & CLS250, both with the OM651, the CLS has done 118,000miles (no AdBlue). I have replaced the alternator, turbo hose & a DPF pressure switch, its has been an extremely reliable. Unfortunately the ML250 130,000 miles with AdBlue, has had numerous issues, 2 water pumps, Oil Cooler, transfer case chain. Nox Sensors DPF, & catalytic converter were replaced under warranty. Its finally running well, I think the old Nox Sensors (replaced under a recall at 80,000 miles) caused a lot of issues with the DPF.
Intake manifolds are prone to cracking at lower bolt and leaking. Since they are plastic.
You're completety wrong about the chain issues- It does wear out, so as the tensioner, the chain can stretch pretty much, also the guides can break into pieces. If you still not convinced- The cam gear breaks also. Please look it up yourself- there's a guy in Poland, he's on yt too - p.a.r.d.i. mercedes (try without the dots). Search for 651, see for yourself.
Found your comment! Looks like CZcams liked it this time lmao.
About the video you referenced, I just watched it! Don't speak the same language so can't understand what he's saying, but I did see the evidence of severe stretch. I did notice however the abnormal oil varnish discoloration on everything. You typically see that from gas engines running non-synthetic oil. My guess would be that engine was not running correct spec oil, or was suffering from oil starvation. I just saw a video last night of a om651 in a W212 with 330k km, the chain had virtually no stretch and the sprockets/chain looked considerably cleaner.
OM646 owner here. Highly doubting about upgrading to OM651.
The OM561 NOX sensors are prone to failure. I've seen sensors go bad in one year. There's two of them in the car.
About 800 euros per sensor. Only OEM sensors are a wise choice, since the aftermarket ones last 1-3 months. Have to be changed at the dealer or no warranty for the part.
Having an AdBlue system in your merc can potentially cost you 2000 euros or more per year.
and replacing those nox sensors is a hell of a job...
@@pauliuspaulius240 DPF delete. Problem solved.
@@kaito1412kiddo I have run one year now with AdBlue delete and the motor runs like new. I had to do the delete it because the NOX sensor broke down all the time. The NOX sensor prices feels like a scam.
Euro 5 engine/ variant and you won't have those issues only EGR and DPF because DEF/SCR was brought in for the euro 6 engine regs. The Euro 6 upstream sensors are easy enough to change however the down steam is always a b*stard due to the AdBlue corroding/ seizing the sensor in the port
hi you have great knowledge in this OM651 engine, can you show the location of the EGR please?
The EGR sits on top of the engine above the inlet manifold. It is mated to the cooler as a single unit when removing (at least on the sprinter vans, may be different on other model vehicles). Send me a message and I shall send pictures of it both on and off the engine.
I just had the check engine light on for the last 2 days and its the o2 sensor. Car has 68000kms
Around 360,000km in 14 years (not too much) - here is the list what was replaced on engine:
Malfunctioning parts:
- Water pump at 170.000km (leak)
- ESP/ABS electronics at 250.000km (dead)
- Few sensors (O2, NO2 - dead)
- Chain at 330.000km (rattling started)
- Battery (1st after 10 years, second after 4 years)
Preventive maintenance:
- One injector replaced at 310.000km (preventive maintenance) and other 3 cleaned
- Oil inter-cooler at 350.000km (preventive maintenance)
- inlet manifold (plastic part) replacement at 310.000km (preventive maintenance)
- Starter (working but noisy on start - preventive maintenance) at 330.000km
- Alternator refurbished at 350.000km (preventive maintenance)
What's the deal with the ESP/ABS electronics at 250kkm? My ESP/ABS goes out if I accelerate very softly and drive around or go up hills. If I accelerate with a moderate strength and drive around in cruise control, usually no issues. Turning off the car and back on again fixes it, wondering if I'm gonna get the same thing soon
@@marvinwilliams7938 Had some sort of similar problem where occasionally ABS/ESP stopped working with warning on a screen and when I restarted the car it started to work ok (like it was self repaired). At the end it was found out that module's electronics was a problem and when they replaced it, never saw this again for the last 5 years.
Exactly the same problem I had (message miracleoisly dissapeared many times and return back) and after the replacement all good.
Спасибо вам 👍
First can is the DOC and the second one is the DPF
the chinese Elon impersonation was spot on xD
I have this engine in my Infiniti q30s (UK)
Huhh, that's complicated. For now I'm staying with my OM648. :)
OM651 C200 CDI here with oil leak issues.
Fixed:
- valve cover gasket
- oil cap seal
- injector washers
- oil pan glued with a sealant
Possible leak sources:
- oil filter housing
- timing chain tensioner
I still have a visible oil leak dripping down from the passenger side, above the oil pan and the oil plug area. What would be the source? I doubt it's the tensioner, getting it replaced soon. Can the oil filter housing leak down from the passenger side?
Did you check the crank case vent valve?
yeah that's not leaking. Possible other leak sources could be:
- Exhaust manifold nuts
- under the turbine, oil return line from turbine to block
- somewhere around the oil dip stick location
@@MBDieselFreak
Oil Filter Housing is very common also
The Oil cooler is a very common failure, and leaks as you have described its cheap to buy a replacement but a few hours labour to change it.
Happened on My e250, make sure you replace the cooler itself and not just the seals as they can crack internally or so i was told
@@davidwhite9473 thanks for mentioning this! I haven't heard of oil cooler issues. One tip though, when I was looking up the part, you CAN buy a seal kit on eBay that includes all 9 seals that go between the block, coolant housing, oil cooler, and filter housing. Saves a bunch of money. I would go that route unless the plastic filter housing is busted.
What is that pulley for where power steering pump supposed to be?
Just an idler pulley for the belt. Doesn't drive anything.
@@MBDieselFreak thank you
My oilcap on my s205 250d is also leaking 😅
religious 10 k km oil changes and they will treat you well.
16:00 something went wrong with your catalyst😂?
Ive have the Infiniti Q50 with the OM651 engine single turbo not twin like this one( Or the GLC Twin turbo). regular oil changes (@15,000 Not 25k is better ....
No oil pressure and lubrication problems?
You can talk to any MB mechanic in Europe, and most of the time, when a OM651 is rattling (and waaaay before that example on startup), the cure is to replace the chain, tensioner, chain guides and often the sprockets, as all of it is worn out.
By replacing the tensioner only, you’re waiting for a disaster to happen, and they do happen.
The OM651 is one of the worst Mercedes diesel engines _ever_!
Btw, I had one, and when I first started to hear the timing chain (way quieter than that example), it took it to a MB dealer, and they replaced all those things that I mentioned.
The car had around 80k miles.
But you could find engines with the same mileage which had already broken the chain, with a new engine tab presented to the customer, in a car fully maintained by the dealer since day one.
I’m happy that I got rid of mine (I was happy to give it to May ex-wife 😉).
You're sure that the chain, sprockets, and guides are worn out as well by the time the tensioner needs replacement? Because I've seen numerous forum posts as well as CZcams videos demonstrating that the chain and sprockets were still good and didn't warrant replacement. Dealerships will ALWAYS replace complete assemblies in a repair, they will never just replace individual internal components for fear that other affected systems may fail in the future. This is why dealerships replace entire transmissions or engines rather than attempting to repair them. Nearly every single example I've seen of catastrophic engine failure on the om651 has been from user error, like running it out of oil or never changing the oil.
But then again, the only examples I've seen are from mechanics/owners that speak publicly about it.
Sounds like you got duped by the garage. Lol. The 651 is a stellar motor just don't do the idiotic 10k OCIs 🤣
Well it looks it ddnt like u,mine is like heaven on earth
what happened with the comment I left couple hours back? Did you remove it? It was about the chain problems.
Haven't removed anything! Did you leave it on another video possibly?
@@MBDieselFreak ok, I will write again.
@@MBDieselFreak Happened again- I mentioned about another channel as a reference- is this the reason why this comment has been removed ?
@@nico-toscani it's possible, I think there might be like some kind of anti spam filter with CZcams that prevents external links. PM me if it's a question
i live my life happy again after selling my mercedes with om651
👍🏻🇺🇸✌️🏴
Disaster worse to work on had. Nothing but problems
Try replacing the egr,what a silly design.
Vacum watter pump ? What a hell are youu talking about, nonsense
The biggest enemy are def
Junk.
Hardly 🙄🙄🙄
If an engine isn’t made in America it’s not worth your time…. Junk!
can I get an email for you please I have a lot questions ... mine has lost power and doesn't launch anymore