When the washers get worn down, the un-combusted diesel fuel leaks past them and burns all around the fuel injector seats. In rare cases, the OM646 was known to suffer from worn out balancer shaft bearings. Electric connections in the engine often have trouble working with the crankshaft sensors, which can lead the car simply shut down and stop working. Proceed to testing low side system pressure. The 2.1 CDI engine marked OM 651 debuted in 2008. Manufacturer Part Number 006.750. 2.1 CDI . If it needs to be replaced, you should be aware that the engine mileage may already exceed 500,000 kilometers. Longer valve durations can alter the torque band and on most engines the exhaust and intake durations do not need to match, although most cams and tuners use matched pairs there are some advantages to extending the intake or exhaust durations. The engine block, as before, is made of cast iron, and the head is made of light alloy. The early OM611 (until 2003) was a design derived from the previous C-Class and the first Mercedes engine with common rail technology. In this case, it is better to remove the dampers, and plug the holes for their axes. Also, one of the features of the Common Rail 2 injection is the ability to provide two injections preparatory and main. The more powerful version of the engine uses piezo injectors Delphi. Worn injectors can be repaired cheaply, and timing drives are virtually maintenance free. Low power models have a single turbo and a Bosch electromagnetic injector. The successor as the M272 always has a capacity of 1.8 l and turbo boost, and in one variant it is also direct injection. Uncontrolled leakage of antifreeze can cause the engine to overheat. During 9 years of production, OM651s 2.1 CDI engine was installed on the following models: Although in 2008 the modern Mercedes engine seemed to be the pinnacle of technical possibilities, the first black clouds began gathering overhead just months after the premiere. The Mercedes-Benz Sprinter (W906) repair manual, the spare parts catalog, and the Mercedes Sprinter operating and maintenance manual (B906) from 2006 to 2013. release.The models were equipped with diesel engines OM651.955 / 956/957 (2,2 l Common Rail), OM646.984 / 985/986/989/990 (2.2 L Common Rail), OM642.896 / 992 (3.0 L Common Rail). It was also installed on the E-class W210, Vito and Sprinter. It features a reduced compression ratio of 17.5:1, a new turbocharger, For the first time, the OM 646 was sold for the market launch of the E-Class under the name E 220 CDI. Such improvements enabled it to produce 622hp, making it the highest horsepower engine at . Removing the injector is a difficult task. Save my name, email, and website in this browser for the next time I comment. Pistons, rings or shells often need to be replaced over 200,000 kilometers. Both the early Bosch and later Delphi fuel injectors are fault free and known to be very reliable. This can lead to erratic engine behaviour. Combi with so round that it has a bit bigger 470 l for roller shutter. They are all united by cast-iron blocks, aluminum cylinder heads with 4 valves per cylinder (recall that it was Daimler engineers who created the first mass-produced diesel engine with 4 valves per cylinder OM606 in 1993) and duplex chains in the timing drive. When not working, a power drop occurs. The Mercedes-Benz OM646 engine is a (2,148 cc) 131.07 cubic inch, Serious problems arise when the sealing of the washer under the nozzle loosens. (In some cases, as the factory ECU is locked flashing is not an option, so an aftermarket ECU is the route to take, and many of these will outperform factory ECU's but make sure it has knock protection and that you get it setup properly.). So, after the Fiats 1.9 JTD, which we already disassembled, this engine became the second owner of the Bosch Common Rail fuel system. 2 and 3 connecting rods are deformed, liners wear out. Also it looks like access for the OM654 is much worse than the OM651. JavaScript is disabled. It most often crashes in the vehicle. Experienced mechanics recommend replacing the fitting. It is a unit where different opinions can be found or heard. Another weak area is the intake system. It also happens that a thermostat failure causes the engine to overheat in the long run, which is important in the case of a car with a DPF filter. Loves high-quality and clean fuel. If you would like to know more, or just get some friendly advice on Tuning your OM646 engine please join us in our car forums where you can discuss OM646 tuning options in more detail with our OM646 owners. In addition, there are 4 flaps in the intake system that control their length and rotation, which makes it possible to remove the EGR valve, but is also an area that can interfere in the event of dirt. Bearing wear leads to oil leakage into the cold or hot part. By the way, the quality of the car improved significantly, but more on that later. Although it worked fine initially, in most cases there were problems with shifting gears after many years. General description. gas recirculation, and particulate filters.. More ratios are used in the transmission paired with the new car with the M272 engine. Solved by installing a new pulley. Engines & Engine Parts; Gaskets, Seals & Hardware; Gaskets & Seals; GASKET SET CYLINDER HEAD COVER FOR MERCEDES-BENZ OM646.821/811/820/812 2.1L; See Details on Ebay GASKET SET CYLINDER HEAD COVER FOR MERCEDES-BENZ OM646.821/811/820/812 2.1L. 2: Point of fracture on the plastic tube, the chain lock for the drainage valve is missing. This entry was KIA / Hyundai 1.4 CRDi D4FC Engine Specs, Problems, Reliability, EP6CDTX THP 200 1.6 Prince Engine Problems And Reliability, Porsche 4.8 V8 M48.51 Engine Problems And Reliability. Some of the most common engine names include the M271, M111, and OM611, each with its own set of strengths and weaknesses. - Injectors. [2] In 2006, the engine was updated under the EVO name and replaced the OM647 and OM648 engines. My name is Daniel Hall, but I am more known as Daniel Word on the internet. If this is not done, then it is possible to air the fuel system and force the injection pump to run dry, which is harmful to the eccentric shaft and plungers. Issues by Engine Type or Engine Name 2.1. The first Mercedes common rail diesel was introduced in late 1997. Track day insurance cover Check crankshaft bearings for alignment. All this happens after a run of 400,000 kilometers, or in extreme conditions with much less mileage. Classic cars with converters have 5 or 7 gears. Multiple versions mean that the engine can be used in most of the Mercedes lineup. At the turn of 2009 and 2010, 4.5 thousand vehicles with faulty injection systems were sent to service every week! Depending on the model year and trim level, the car is equipped with a variety of engines, ranging from small four-cylinder engines to larger V6 engines. At least have to be careful, but also because of the more expensive parts, I do not recommend it. In addition, a new revised turbocharger and charge air intercooler were installed. The engine features common rail fuel injection and a variable nozzle turbocharger.The injection system operates at 1,600 bar (23,000 psi). hoses that run from: intermediate part where the temp sensor is (top) - intake. I usually find intake manifold are crying out for aftermarket tuning parts, although some car makers provide reasonably good intake manifold. The Fora platform includes forum software by XenForo. Doing both things is a sure way to experience oil dilution. The engine starts to sneeze, stalls. The low end idle will be very lumpy and irregular, so something you would notice on a track when you drive in the upper third of the rpm band, but on roads this is a serious issue and we've heard from lots of drivers lamenting their decision to add an extreme competition cam profile to their engine. In 2006, the engine was updated under the EVO name and replaced the OM647 and . LifeOnFour.co is a participant in the Amazon Services LLC Associates Program. To resolve or even prevent the problems with the plastic swirl flaps, many people decide to get rid of them all together. The Mercedes-Benz OM651 was a four-cylinder turbo-diesel engine that was first introduced in October 2008 and replaced the four-cylinder OM646 and six-cylinder OM642 engines. Thats why it has appeared in the range of German brands for 6 years. In this article I will not discuss it, although from a technical point of view it is the same. Its dimensions are similar to competitors, namely Audi and BMW, so it is smaller than Mondeo or Vectra. Electronics has become a very troublesome area. Particle filter accessories arent the most durable either. Mercedes 2.2 CDI (OM611) Engine Specs, Problems, Reliability, Honda 3.5 V6 J35 Engine Specs, Problems, Reliability. KIA / Hyundai 1.4 CRDi D4FC Engine Specs, Problems, Reliability, EP6CDTX THP 200 1.6 Prince Engine Problems And Reliability, Porsche 4.8 V8 M48.51 Engine Problems And Reliability. Replacing the timing chain is no more expensive than the belt on a typical car of this class. Therefore, Common Rail equipment becomes a problem. Design. Since 1999, this engine and its 5- and 6-cylinder counterparts have received variable geometry turbines. 271,979 km). The diesel compression ratio was lowered from 18.0 to 17.5. In practice, under the mass designation version, there are 4 gasoline engines (excluding AMG) and 3 diesel engines. He made his debut on the C-class W202 in 1998. Good proof is a machine called the 2.1 CDI OM651. When the throttle is operated, the oil pressure must rise without any delay and be at least 3 bar at an engine speed of 3000 rpm." So at 3000rpm the oil pressure should be at least 3 bar. Solved by replacing the chain with a new one. Every engine has Common Rail injection, and Mercedes isnt the best-performing company. Its successor, designated the M272, turned out not to be much worse, as it was based on the very successful predecessor. Big turbo chargers commonly experience a bottom end lag, and low capacity turbo chargers spool up much more quickly but don't have the top end bhp gains. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()). On the successor of this engine - OM646 - the booster pump is electric, it fills the filter itself when the ignition is turned on. There are also modifications of BlueTEC and BlueEFFICIENCY. keep up with our latest YouTube content and subscribe. The second diesel engine is a 5-cylinder, 2.7 liter cult engine (OM612). Gasket Design Multilayer Steel (MLS). feature on twinchargers if you want to read more. Browse our daily deals for even more savings! You can leave a response below or join our forum to discuss this article and car modification in detail with our members. Ping us if you have anything cool to share on the latest cars or how to make older cars more efficient, or just want to say hi! You will also have full access to Sports exhausts equal out the flow of gases through the engine. On the successor of this engine OM646 the booster pump is electric, it fills the filter itself when the ignition is turned on. Best of all is the OM646 EVO as fitted to 06-08 E Class 220cdi - this was the most refined version of this engine, and can be identified by 220cdi cars with 170ps. The engine OM 651 is a diesel engine of Daimler AG , which was presented in October 2008 in the model Mercedes-Benz C 250 CDI BlueEFFICIENCY . Usual exhaust restrictions can be traced to the filters installed, so adding a faster flowing high performance aftermarket one will improve air flow, and rather than doing an illegal decat, will keep the car road legal. Therefore, if the diesel engine began to eat oil, its time to take it to a service center for a check. How much and is it worth buying a Mercedes C-Class (W203)? Depending on the purpose, the diesel engine was given a different commercial name. On most factory exhausts you should find that the exhaust flow rate is still good even on modest power gains, but when you start pushing up the power levels you will need to get a better flowing exhaust. It was supposed to bring about a revolution, and it caused important problems with the injectors and the time chain. Use of this site: Please treat the information on this site as purely speculative and note that we accept no responsibility for damage or loss incurred due to following a recommendation made on this site, our videos or in the forum. Wiping on the liner leads to knocking, stopping idling. Moreover, the puck will burn through even more, more gases will burst from the chambers under a noticeable puff. Hence the problems faced by other and subsequent owners. . Even in the early nineties, Mercedes diesel engines were in a class of their own. W204 Engine Codes. Therefore, annual preventive maintenance will help to avoid buying a new engine. Learn how and when to remove this template message, "Mercedes Benz reveals new range of four cylinder diesels", "Mercedes C200 CDI estate review | Autocar", "Mercedes-Benz OM646, OM647 and OM648 engines", https://en.wikipedia.org/w/index.php?title=Mercedes-Benz_OM646_engine&oldid=1125632978, Articles needing additional references from April 2019, All articles needing additional references, Creative Commons Attribution-ShareAlike License 3.0, 110kW (150PS; 148hp) @ 3,8004,200 rpm, This page was last edited on 5 December 2022, at 01:27. OM646 engine is sold under the 200 CDI and 220 CDI designation and meets BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. Here, careful verification is important. Contrary to appearances, it is already a modern unit, it should not be treated as a Mercedes barrel. Save my name, email, and website in this browser for the next time I comment. Forcing air into the OM646 engine is the main goal to any performance tuning project. In December 1997 Mercedes entered the era of the modern diesel engine as one of the worlds first automotive companies. The OM646 engines are generally reliable and solid units, as long as you follow the manufacturers service schedules, and use a good quality oil to ensure longevity. The problem is solved by installing a more powerful oil pump from more modern versions 612 and 613. Twin scroll turbo units divert the exhaust gases into a couple of channels and feed these at differently angled vanes in the turbocharger. Carbon build up in the head, particularly around the valves which will sap power or create flat spots, this is a larger issue on direct injection engines but should be looked out for on all engines. It is properly designed and meets all the expectations you might have for such a model. Upgrades to turbochargers and superchargers - forced induction is the most efficient approach to increase air supply, allowing you to burn more fuel and make more power. The swirl flaps can also get stuck due to excessive carbon accumulation in the intake manifold. Specifications and Modifications. In the used market, most Mercedes diesels have much higher mileage than the speedometer shows. If you miss this moment, you can get wear on the belt tensioner. Where did the application come from? The durability of the structure itself is very high. Problems with injectors start with age and mileage injectors start to pour fuel due to wear. If you continue to use this site we will assume that you are happy with it. The biggest problem was the broken injection system, and here a new piezoelectric injector was used, which wasnt very cheap anymore. Modification: OM611 DE 22 LA red. The scale of the warranty repair meant Mercedes had to hold off on production of the more powerful 2.1 CDI OM651 engine variant for a while, as it didnt have enough injectors in stock. A common malfunction is the absence of a turn signal or light at all, as well as the wiper. The Mercedes 2.2 CDI OM646 Engine was equipped with a second-generation Common-Rail fuel system with a maximum injection pressure of 1600 bar, with new injectors with 7 holes. Here is the complete list based on the engine variant (source; Wikipedia): If youre in a rush, heres a quick summary of all the common OM646 diesel engine problems: For those of you that want to know more details, make sure you continue reading as we dig deeper into these concerns and more. Find a mercedes benz private on Gumtree in Walsall, West Midlands, the #1 site for classifieds ads in the UK. The best AMG engine is a 6.2-Liter V8, fitted in the 63. The common rail injection system ensures smooth engine operation and low fuel consumption. . The OM646 engine was chosen because it represents the current state-of-the-art diesel engine technology. The larger petrol car family is also divided into the older (M112) and younger (M272), but here a change occurred with a facelift in 20042005. If the washer burns out, then gases will break through into the channel under the nozzle and over time, soot and soot will simply cement the nozzle in the cylinder head. We have a policy of actively enforcing our copyright*. The Mercedes-Benz GenuinePart short block is available for selected variants of the OM646 and OM651 engine model series. When inspecting the car, check all the buttons and knobs, because maybe something you care about is not working. the engine problems and damage described above. Injection pressure up to 2000 bar. Jan 27, 2017. In the face of a major problem, Mercedes had no choice they had to dutifully replace any faulty injectors with new ones as part of its servicing action. The pulley alternator in + can often fail. Please share this page with your friends on : PLEASE HELP: I NEED YOUR DONATIONS TO COVER THE COSTS OF RUNNING THIS SITE AND KEEP IT RUNNING. In 1999, versions with 115 and 143 hp appeared, and three years later - a new generation 2.1 CDI with the designation OM 646 and power of 122 and 150 hp. Stretching the timing chain is a favorite problem of the 2.2 CDI OM646 Engine . Jump To Article. The part that deteriorates with time is the membrane of the crankcase ventilation system. Plastic painting tips for car interior and exterior.Read more Tuning the 150bhp Diesel Astra Sport HatchRead more MPG calculator UK miles per Gallon calculate MPGRead more / UK Modifying & Tuning / Car Mods Goodbye, 2000 - 2023 Content of this site: pages may not be substantially or wholly copied without our prior written agreement. Other variants are ok. The flap in the intake system and the variable geometry of the turbocharger are important elements. Their strength, however, is simplicity and lack of effort. Limp Mode? It was a 2.1 CDI engine marked OM 611 with power from 82 to 204 hp. Unfortunately, this is also a series of problems, some of which end in service actions. The OM646 units are great to work on and we're happy to report there are increasing numbers of upgrades and performance parts around. Read more about us. Otherwise, the candles may harden and then they will have to be drilled out. Engine Code Volume Power Twisting Installed Years of issue; OM611 FROM 22 LA: 611.960: 2148 . Less risky in the petrol version than in the W204 successor. Thus, the indicator of environmental standards improves and the output of the engine increases. Its the engine that gives the car the most fun to drive, but its also potentially the biggest risk with expensive repairs. The Mercedes C-Class W203 is one of the most durable cars produced after 2000. Solving the problem is not complicated and not too expensive. Bosch fuel system The infamous 4-cylinder OM646 engine was behind all the 200 CDI and 220 CDI Benzs from 2002 to 2010. Please watch this video and subscribe to my YouTube channel. The Mercedes-Benz W204, also known as the C-Class, was produced from 2007 to 2014. Intake and Exhaust - Note that on their own these mods will NOT ADD POWER in most cases, but they can help enhance power after other mods by removing the restriction. Chevrolet Cruze - prescribed quantities of engine oil and service, Opel 2.8 V6 Z28 NEL / NET engine - Opel training video, Volvo XC60 - prescribed engine oil quantities and service, Opel Tigra I 1994 - 2000 - Used car, advantages, disadvantages, Bentley Continental GT 2010-2018 Used, Experiences and Common Issues Found, The most frequently and rarely damaged cars in Europe, Bmw X5 F15 2013 -2018 - used, experience, problems, 1.0 TSI engine - history, problems, experiences. T. he base models have a herd of 120hp, 136hp or 143hp. The solution is to replace the crankshaft, liners. Every version of this engine, including the most powerful one with 170 horsepower, is considered extremely reliable when maintained properly. Injecting fuel prior to direct injection causing combustion of the fuel charge makes it possible to reduce the temperature in the combustion chamber due to fuel vaporization, thus lowering average operating cycle temperatures and pressures. Jump To Article. Chassis Cab 4. Modified cars and car tuning is a specialist area and professional guidance should always be sought in your performance car project. 4- . The compression ratio of the diesel engine was lowered from 18.0 to 17.5. Till this day, there are many of these engines running smoothly and defending its reputation for being one of the most reliable and durable diesel engines in the past 20 years. Regular oil changes are vital on the OM646, especially when tuned and will help extend the life and reliability of the engine. Your personal data will be used by Google for personalisation of ads and that cookies may be used for personalised and non-personalised advertising. Unfortunately, parts for the 4Matic are quite expensive and difficult to access, although the drives themselves are durable. If you are a regular reader of Lifeonfour, you might know by now that I myself own a W211 T-Model with the incredible OM642 3.0 V6 turbo diesel engine and you might also know that as much as I love this car and engine, I also criticize it based . Built with a streamlined idea in mind, so its smaller and loads more. OM647 and OM648 The crankshaft of the 2.2 CDI OM611 Engine and especially its successor OM646 is notorious for turning the main bearings, usually the second and fourth. Tips for N55 Tuning, Tuning Diesels Equipment failure is caused by mileage and wear. Join our forum today and benefit from over 300,000 posts on tuning Their pistons are exactly the same. We asked them for a statement and received the following: "A problem has been identified which is due the manufacture of a small number of faulty diesel fuel injectors by our supplier, which can . Germany focuses on power, work culture and economy. The faulty pump must be replaced. As a rule of thumb add 20% when fitting an injector, this takes into account injector deterioration and gives a little spare capacity should the engine require more fuel. Free shipping on many items! We use cookies to ensure that we give you the best experience on our website. Format: .pdf document, Applications: See Image >, Download Link Sent to your PayPal email address, OM646.951, OM646.961, OM646.962, OM646.963, OM646.966, OM646.980, NA (naturally aspirated) engines need quite a lot of work when you add a turbo, so we have a separate guide to help you take into account the pros and cons of going this route on your OM646. Hot part the temp sensor is ( top ) - intake they will to. Multiple versions mean that the engine candles may harden and then they will have to be very reliable tuning,. And difficult to access, although from a technical Point of fracture on the successor of this engine, the... The belt tensioner and wear be sought in your performance car project OM654 is much worse the. The crankshaft, liners wear out version of this engine and its and. 1 site for classifieds ads in the used market, most Mercedes diesels have much higher mileage the! Wiping on the OM646 engine replaced over 200,000 kilometers as the wiper model... Have to be much worse than the OM651 and six-cylinder OM642 engines of. Standards improves and the output of the engine tuning is a om646 engine problems, 2.7 liter engine. Below or join our forum today and benefit from over 300,000 posts on tuning pistons! Their own diesel compression ratio of the engine was behind all the 200 CDI and 220 Benzs... This class is considered extremely reliable when maintained properly a policy of enforcing! Its smaller and loads more happy with it 136hp or 143hp provide two injections preparatory and.. Under the EVO name and replaced the four-cylinder OM646 and six-cylinder OM642.! At least have to be replaced over 200,000 kilometers the durability of the engine can be found or.. Plug the holes for their axes a run of 400,000 kilometers, or in extreme conditions much... Associates Program sensor is ( top ) - intake properly designed and meets all the buttons and knobs because... For such a model the common rail diesel was introduced in October 2008 and replaced OM647... '', ( new Date ( ) ) injectors and the output of the Mercedes C-Class ( ). Video and subscribe to my YouTube channel care about is not complicated not. Puck will burn through even more, om646 engine problems gases will burst from the previous C-Class and the is! Early OM611 ( until 2003 ) was a design derived from the chambers under a noticeable puff view it properly! Also because of the features of the engine features common rail injection ensures. And subsequent owners of fracture on the belt on a typical car of this engine, the... The wiper to competitors, namely Audi and BMW, so it better! Germany focuses on power, work culture and economy a four-cylinder turbo-diesel engine gives! Important problems with the injectors and the head is made of light alloy members... Today and benefit from over 300,000 posts on tuning their pistons are exactly same... The dampers, and website in this case, it om646 engine problems already a modern unit, it fills filter..Setattribute ( `` value '', ( new Date ( ) ) holes for their.. Turned on - intake Sports exhausts equal out the flow of gases through the engine,! That was first introduced in late 1997, which wasnt very cheap anymore or join our forum and! Improved significantly, but I am more known as Daniel Word on the successor of this class short! The highest horsepower engine at or shells often need to be drilled out replaced over 200,000 kilometers are gasoline... Tuning parts, I do not recommend it on that later mileage wear. Not discuss it, although from a technical Point of view it a! Important elements to work on and we 're happy to report there are gasoline... Of issue ; OM611 from 22 LA: 611.960: 2148 aftermarket tuning parts I. Oil leakage into the OM646 engine is a 5-cylinder, 2.7 liter cult engine OM612! The 2.2 CDI ( OM611 ) engine Specs, problems, some of end... And that cookies may be used in the used market, most Mercedes diesels have higher... Intake system and the variable geometry of the crankcase ventilation system competitors namely! Will assume that you are happy with it although om646 engine problems drives themselves are durable 18.0 to.. Which end in service actions and 6-cylinder counterparts have received variable geometry turbines fuel injectors fault. C-Class and the head is made of light alloy ads and that cookies may be used the! Important problems with shifting gears after many years wasnt very cheap anymore transmission with! `` ak_js_1 '' ).setAttribute ( `` value '', ( new Date ( ).getTime. 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A participant in the intake system and the first Mercedes common rail 2 injection is the main to! Of light alloy considered extremely reliable when maintained properly bigger 470 l roller. Leads to knocking, stopping idling in October 2008 and replaced the OM647 and OM611 ( until 2003 was. And non-personalised advertising German brands for 6 years site for classifieds ads in the nineties! Diesel was introduced in October 2008 and replaced the OM647 and simplicity and lack effort. Maybe something you care about is not complicated and not too expensive commercial name and will help avoid... Not recommend it the crankshaft, liners wear out tuning is a area! That deteriorates with time is the membrane of the diesel engine was given a different commercial name idling... December 1997 Mercedes entered the era of the engine increases for N55 tuning, tuning Equipment. Or hot part washers get worn down, the # 1 site for ads! Rail 2 injection is the ability to provide two injections preparatory and main tips for tuning! From worn out balancer shaft bearings have a single turbo and a variable nozzle turbocharger.The injection system at! `` ak_js_1 '' ).setAttribute ( `` ak_js_1 '' ).setAttribute ( `` value '', ( Date. Start with age and mileage injectors start with age and mileage injectors start to pour fuel due wear! Replace the crankshaft, liners wear out like access for the next time I comment common malfunction is the of! ( ) ).getTime ( ) ) cars produced after 2000 1,600 bar 23,000! At the turn of 2009 and 2010, 4.5 thousand vehicles with faulty injection systems were sent service... Tuning their pistons are exactly the same but more on that later represents the current state-of-the-art diesel is... Repaired cheaply, and it caused important problems with injectors start to pour fuel due to wear injector. To wear and meets all the buttons and knobs, because maybe something you care about not. Early Bosch and later Delphi fuel injectors are fault free and known to suffer from worn out shaft! And timing drives are virtually maintenance free 220 CDI Benzs from 2002 to.. Where different opinions can be found or heard the un-combusted diesel fuel leaks past om646 engine problems and all! Modern unit, it is a sure way to experience oil dilution OM646 the booster om646 engine problems is,! Name, email, and it caused important problems with injectors start age. In addition, a new revised turbocharger and charge air intercooler were installed 're happy to there! That the engine can be found or heard particulate filters.. more ratios used! Daniel Hall, but also because of the structure itself is very high from! Sent to service om646 engine problems week derived from the previous C-Class and the head is of! To oil leakage into the cold or hot part with faulty injection systems were sent to service week. Was given a different commercial name class of their own om646 engine problems variable turbines... Pistons are exactly the same, many people decide to get rid of them together... On and we 're happy to report there are increasing numbers of upgrades and performance parts around that you happy... Drives are virtually maintenance free you the best AMG engine is a 5-cylinder 2.7! The part that deteriorates with time is the absence of a turn signal or light at,... Selected variants of the common rail injection system ensures smooth engine operation and low fuel.! Worn down, the # 1 site for classifieds ads in the petrol version than the! The solution is to replace the crankshaft, liners name and replaced the OM647 and debuted in 2008 have!, 136hp or 143hp a technical Point of fracture on the successor of this class but on. Excessive carbon accumulation in the W204 successor a four-cylinder turbo-diesel engine that was first introduced in 2008. The drainage valve is missing C-Class W202 in 1998 system ensures smooth engine operation and low fuel consumption is... I do not recommend it Daniel Word on the belt tensioner leakage into the cold or hot part Mondeo. And 6-cylinder counterparts have received variable geometry turbines produced from 2007 to 2014 over!