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. These are the most common oil leaks locations of the OM648 engine: However, Its important to note that the OM648 engine does not suffer from the same oil cooler leak like the V6 OM642 engine. Equipment failure is caused by mileage and wear. There are many guys spending a fortune on turbocharger upgrades on the OM612 only to suffer the humiliation of seeing the engine block explode just after it's completed. Engine Mercedes OM612 The Mercedes Benz OM612 engine is a 5-cylinder diesel engine with 2 overhead camshafts that drive 20 valves through pushrods. The difference cuts in at motorway speeds where the mid range punch starts to show. Another problem and on a large scale is corrosion. This includes fuel injector failure, turbocharger failure, high-pressure diesel pump failure and numerous seals deteriorating and creating both oil and fuel leaks. Heres more about the actual engine. Another weak area is the intake system. How would we describe the OM612 engine reliability? Cookies are used to track visitor behaviour enabling us to monitor and optimise the effectiveness of our content via Google Analytics, and to remember your preferences and settings on this site. He made his debut on the C-class W202 in 1998. The common rail can store diesel which is pressurised by the high-pressure fuel pump and supply it to the fuel injectors at the time of fuel injection. It is a unit where different opinions can be found or heard. LifeOnFour.co is a participant in the Amazon Services LLC Associates Program. It wasn't even a hot summer. This excess oil in the system eventually hits the EGR, it completely overflows it and you get leaks. Diesels. Your Constructive comments on this article, I really want to improve this article with your help and suggestions. DPF cleaning The OM646 is an extension of this engine with a thoroughly modernized cylinder head, but generally the same engine. Low Fuel Economy? How to reset assyst plus in Mercedes Benz? Crankcase position sensor. It is one of the most costly upgrades but provides the best gains. Please use our forums if you wish to ask a tuning question, and please note we do not sell parts or services, we are just an online magazine. It now has 40k miles. I just started the process of opening a case with MB. Mercedes Benz OM612.963 (270CDi) engine (2.7, 120 kW) This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". Modification OM 612 DE 30 LA: 5-cylinder, 2950 cm3, bore and stroke 88 and 97 mm, respectively, generation CDI II generation. Mercedes Benz OM 612 was even capable of running on biodiesel or vegetable oil without any major modifications. The biggest problem was the broken injection system, and here a new piezoelectric injector was used, which wasnt very cheap anymore. Manifolds clog with EGR deposits. You can read our full review of the OM642 engine to get a better feeling for all its problems and difficult repairs. High mileage OM648 engine problems. OM612 has two versions, one was the 2.7 litre that produced 160 horsepower and 370 NM of torque. A new EGR valve will cost you upwards of $300 so keeping an eye out on the state of the EGR and resolving any related issues early is a smart move. Please help us improve these tips by sending us your feedback in the comments box below. Problems with injectors start with age and mileage injectors start to pour fuel due to wear. Worn injectors can be repaired cheaply, and timing drives are virtually maintenance free. Why word? Carbon deposits lodge on and around the swirl flaps until they eventually block their movement completely. Save my name, email, and website in this browser for the next time I comment. Therefore, Mercedes Benz diesel engines are the best engines. A failed glow plug will cause a diagnostic trouble code to pup up, making it easy to know which glow plug needs replacement. However, I dont think its worth buying this model for as low as $1500-$2500. You must log in or register to reply here. It seems like it would be pretty straight forward being that it is replacing a 2.5 diesel I-5 with a 2.7 diesel I-5. Keep in mind that despite being some of the best diesel engines ever, they are now at least 17 years old. The issue is, these swirl flaps are plastic, and this plastic gets brittle with age. The internal components of the EGR, including its electronic brain, are prone to failure, and weve seen this happen on the OM648 engine numerous times. There were two modifications of the crankshaft, because the working volume of some versions is different. As this happens, the black dried diesel gunk bakes the fuel injectors in their seating, making them very hard to remove. Replacing the timing chain is no more expensive than the belt on a typical car of this class. Yes, as above, they rarely give problems with the chains etc, even when abused. The OM 612 was based on OM611 which was a smaller inline 4 cylinder engine. When inspecting the car, check all the buttons and knobs, because maybe something you care about is not working. Perhaps these vehicles are being properly serviced by the garage-not all the oil is being drained off and it is being changed while the oil is still cold, like 7 liters instead of the 10 L it really holds. Thats why I compiled the list above in this way. Would be interesting to get more info about these cars. As they appeared dry and not having the skill, patience or time, I ignored them. As it fails, the engine will light up a check engine warning light or even go into limp mode. Many of these engines are being killed by owners who go into austerity mode, which means using the cheapest oil and consumables. feature on twinchargers if you want to read more. If they get stuck in a closed position, they severely impact the operation of the engine. The reason for this malfunction is seen as insufficient performance of the oil pump against the background of a high load on the crankshaft, especially when constantly driving in tightness in high gears on a loaded minibus. Unlucky people struggled with cracked heads or intake manifold flap failure, as well as injection system failure, but most users have good memories of this engine. Their pistons are exactly the same. Generally speaking, diagnosing the issues is fairly simple with Mercedes Star diagnostic tools. Which is better, the newer V6 OM642 engine or the older l6 OM648 engine? Here is a full breakdown. Glow plugs need to be unscrewed at least once every 50,000 km, changed and put on thermal paste. Basically, the engine has no typical faults, but the typical consequences of years of use and neglect (leaks, dirt, less frequently stretched timing chains) are encountered. While the turbocharger used by Mercedes on the 2.1 CDI OM651 engine was extremely durable, on the more powerful model with the Twin Turbo system, the airflow control malfunction occurred. Tips for N55 Tuning, Diesel tuning While this is a highly reliable engine, it is not immune to the normal mechanic wear and tear. Please consider converting them to full citations to ensure the article remains verifiable and maintains a consistent citation style. We strive to provide the internet with information that will ease your purchase of a new or a used car. This is a great machine for long distance driving and for cooperating with LPG. Sign up now!!! After purchase, it is worth taking care of this area. A very distinguishable aspect of the OM647 from the very similar OM612 predecessor is its intake manifold, and the lack of a diesel fuel feed pump. #6. talkinghorse43 said: In my opinion, the 647 is a little better considering the EGR maintenance issue, glowplug access, high pressure pump durability, and a little better fuel economy. The engine offers 160hp and 220Nm of torque and the only thing you need to do is change the spark plugs, replace the oil and the occasional filters. Glow plugs are prone to failure in this engine, however, it is possible that the controller itself fails or the wiring and connectors snap and cause issues. Each OM646, OM647 and OM648 engine had am 88.0 mm bore and 88.3 mm stroke, a cast iron block, alloy cylinder head, second-generation Bosch common-rail direct injection (operating at up to 1600 bar), variable geometry . However, the difference between the R4 and R5 is not big enough to release a more powerful variant. We do this through well-researched buyer guides and common car problems. 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. How much is a 2003 Mercedes Benz e320 worth? As the efficiency of the new generation engines was increased, there was not enough heat to heat the passenger compartment at low temperatures. This prevents the EGR from opening and closing properly, leaving the engine choked up and disrupting the engine operation. Mapping - remapping provides the most advantage in terms of cost savings, aftermarket ECUs, and piggyback ECUs are all alternatives. The OM 612 is like OM611 with one additional cylinder, a 6 cylinder OM613 was also manufactured after 2002. This keeps the car road legal and will flow much better due to it's higher internal surface area and design, so has the added benefit of keeping your car road legal. But, of course, the most terrible enemy of the fuel system is diesel fuel of unknown origin with incomprehensible impurities. Your personal data will be used by Google for personalisation of ads and that cookies may be used for personalised and non-personalised advertising. The blow by contains unburnt fuel and it mixes with the oil. Lets find out whos right! Extending exhaust or intake durations can alter the bhp 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 2.2 CDI OM611 Engine produces from 82 to 143 hp, while its older 6-cylinder brother develops up to 197 hp. My name is Daniel Hall, but I am more known as Daniel Word on the internet. The OM648 is a 3.2 Litre, straight or inline 6-cylinder engines with 4 valves per cylinder. To keep us running PLEASE Donate here. All engines are equipped with intercoolers. Due to the deterioration of the copper fuel injector washers, the pressurized and un-combusted diesel fuel is able to seep past the copper washers, creating a sticky, black mess around the fuel injectors. Many owners unknowingly did not change the refractory washers under the nozzles. Important in the description, because the capacity of the engine is less important than the type. The Ultimate Guide to Mercedes Engine Problems (Diesel & Gas), Fuel injector washer leaks (CDI Black Death). Diesel Remaps The Mercedes W203 is one model that is offered in a wide variety of engines, from small and economical units to large V6 engines both petrol and diesel. Remove your old filter and mount the new filter in the old filter's place. Read more about us. The BlueTec technology includes catalytic converters and diesel particulate filters to meet the exhaust emission requirements. Oil leaks. Most 2.2 CDI OM611 Engine management faults are perfectly diagnosed by a proprietary Mercedes scanner. 128,748 km) is the only solution. the problem of 5-cylinder diesels of the series is increased wear of the camshafts; the timing chain does not serve for long here, its resource is ~ 200-250 thousand km; electrical wiring often burns out injectors and boost pressure sensor; nozzles coke quickly if the refractory washers are not replaced during dismantling; other failures of this engine are related to Common Rail fuel equipment. The fuel isn't the issue, it never was. Which Mercedes Cars Have the OM612 Engine? This article uses bare URLs, which are uninformative and vulnerable to link rot. The petrol engine is the smallest M271 with a capacity of 1.8 liters on offer since 2002 and the slightly older M 111 Evo with a modernized 2.0 liter capacity, pulled quite early after the start of production of the C-Class. Kelley Blue Book identifies engine diagnostics and oil changes as among the most common areas for service. Fuel injector washer problems and "Black Death". Just like with the EGR valve, it is possible to remove the swirl flaps completely without causing a noticeable difference in terms of engine behaviour. Otherwise, the candles may harden and then they will have to be drilled out. There are common areas of failure for every engine, with some being very over engineered and some only able to handle stock power. there is no electrical connection to much or to little and all has fitted well. Its even worse when you have to replace the entire drive with a variable phase wheel. Find many great new & used options and get the best deals for Diesel Fuel Injector fits MERCEDES G270 W461 2.7D 03 to 07 OM612.966 Nozzle at the best online prices at eBay! If not, get ready for leaks galore. 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. However, as you can see in this OM612 Engine Harness Remove and Replace owners forum thread, it is sometimes the only possible solution to various engine issues. Yes, the OM648 inline 6-cylinder engine is amongst the most reliable Mercedes diesel engines ever produces. The third weak point is the variable geometry turbo regulator. Each engine responds better to extreme camshaft durations check your engine on a rolling road. The pre-glow system of the OM648 is in essence extremely simple and reliable. Rules for the operation and maintenance of headlights VW Passat B5 MERCEDES OM 612 DE LA [612.963] MOTOR IDENT-NR. In practice, under the mass designation version, there are 4 gasoline engines (excluding AMG) and 3 diesel engines. Well now you are posting things of a wider picture. The more air you can get into an engine, the more fuel it can burn and uprating the induction with a turbocharger upgrade makes massive power gains. The engine is relatively simple, very popular, so it is not a hassle in terms of service and repair. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Something suitable for one model of car may be completely unsuitable for another - so we can only provide generic theory. Very hard to remove the cheapest oil and consumables the car, check all the buttons and,... Plug needs replacement handle stock power forum is one of the most comprehensive of... Terrible enemy of the engine will light up a check engine warning light or even go into austerity mode which... Was increased, there are common areas for service produces from 82 to 143,! 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