2003 is a time for change. The main areas that actually rotted included the sills, fenders, covers and doors, as well as chassis components. Your Constructive comments on this article, I really want to improve this article with your help and suggestions. The OM 646 is additionally equipped with a balance shaft and an electric fuel pump (instead of a mechanical one). Electronics has become a very troublesome area. Solved by installing a new pulley. By the way, the V8 used later was closely related to this design. Good oil service and replacement of the standard oil pump with a more efficient one, with two gears, helps to extend the life of the crankshaft of the OM611 engine. Also, the cylinder head camshaft drive often wears out. However, in general, the machine is highly rated for its good characteristics, smooth operation and good performance. If an engine is turbocharged, upgrades are going to net you a larger power gain and most turbocharged engines are built using more solid components. A complete set for over $770 is worth replacing when absolutely necessary. TorqueCars will review OM642 tuning and point out the premier mods that work. Be sure to keep up with our latest YouTube content and subscribe. It was available with a variety of petrol and diesel engines, including: 1.6-liter M274 I4 engine; 1.8-liter M271 I4 engine; 2.1-liter OM646 diesel I4 engine; 2.1-liter OM651 diesel I4 engine; 2.5-liter M272 V6 engine; 3.0-liter M272 V6 engine; 3.5-liter M276 V6 . Panel van 3.2. The 2.2-liter in-line diesel engine Mercedes OM611 was produced from 1997 to 2006 and was installed both on passenger models, such as W202 or W210, and on commercial minibuses. The 2.1 CDI OM651 Mercedes engine stands for work culture, economy and high power. If you want less trouble, look for the RWD variant. Some of you might have read my guide on oil dilution and my personal experience with oil dilution on the 6-cylinder Mercedes diesel engine. Answer: Well, that's the diesel engine all the MB techs here stateside want, if that tells you anything. To finally solve the problem, starting in 2011 on motorcycles designated 220 CDI, and starting in 2012 on 250 CDI motorbikes, Mercedes began installing electromagnetic injection devices. That's the OM646 engine in 150PS / 340Nm guise, prior to the 2006 EVO upgrade to 170PS / 400Nm. Unfortunately, this is also a series of problems, some of which end in service actions. The early OM611 (until 2003) was a design derived from the previous C-Class and the first Mercedes engine with common rail technology. The cylinder head has been redesigned to provide even more efficient engine cooling. This article will reveal all the common OM646 diesel engine problems based on our hands-on experience. I especially recommend this option for the more powerful and larger versions of the engine. It was a 2.1 CDI engine marked OM 611 with power from 82 to 204 hp. The first Mercedes common rail diesel was introduced in late 1997. Motorsport and race cams, boost the top end band but as a result the car will not idle smoothly and low end power nearly always suffers. You'll commonly see there's a restriction in the air flow sensor MAF/MAP on the OM646 when considerably more air is being drawn into the engine. New replacement costs at least $ 405. - Coolant leaks. Also it looks like access for the OM654 is much worse than the OM651. However, the compressor is a more complicated component and therefore a bit more emergency. The Mercedes-Benz OM646, OM647 and OM648 were a family of diesel engines with four, five and six cylinders, respectively, which replaced the OM611, OM612 and OM613 engines. I am interested in your opinion about the w211, 220cdi 170hp, means redesign, with a 646 engine, as they turned out, because I plan to buy it, and what to pay attention to when buying Until mid-2006, the OM646 was equipped with the Garrett GTA18V turbocharger, but Mercedes changed that after 2006 to incorporate the newer KKK turbo by BorgWarner. Something suitable for one model of car may be completely unsuitable for another - so we can only provide generic theory. Solving the problem is not complicated and not too expensive. In the late nineties the situation changed. This problem cannot be determined in garage conditions. Browse our daily deals for even more savings! It debuted shortly before the advent of this generation of C-Class. As long as everything works perfectly in the cooling and lubrication system. This article was written by me, Waynne Smith TorqueCars founder, and I appreciate your feedback and suggestions. "All you need to know about tuning the Mercedes OM646 engine!". It features a reduced compression ratio of 17.5:1, a new turbocharger, and ceramic glow plugs for improved engine starts.[3]. Read Also:Toyota 4.0 1GR-FE V6 VVT-i Engine Problems And Reliability. Weak spots, Issues & problem areas on the OM646. These Mercedes Engines Won't Last 100,000 Miles!Mercedes Benz are absolutely amazing luxury cars, but there are some engines that could cause you some pretty. It also has the same problem with oil leakage as the M111. The turbine and floating flywheel rarely manage to cover 150000 km. But, of course, the most terrible enemy of the fuel system is diesel fuel of unknown origin with incomprehensible impurities. The infamous 4-cylinder OM646 engine was behind all the 200 CDI and 220 CDI Benzs from 2002 to 2010. Wiping on the liner leads to knocking, stopping idling. The Mercedes OM646 are good project engines and with a few sensible performance enhancements like a remap, turbo kits and camshafts you will certainly maximize your driving fun. Replacement needed. I do not charge you to access this website and it saves most TorqueCars readers $100's each year - but we are NON PROFIT and not even covering our costs. Caution when purchasing, always use the catalog number - the thermostat has been modernized several times. We use cookies to ensure that we give you the best experience on our website. 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. They are cheaper to maintain, but under more difficult conditions the 4Matic works just fine. They even covered one million kilometers without any mistakes. Typical stage 2 mods often include: induction kit, Ported and polished head, high flow fuel injectors, Fast road cam, fuel pump upgrades, Sports catalyst & performance exhaust. Don't dismiss the need increase the fuel delivery when you are increasing the power - it makes the car more thirsty. Another problem and on a large scale is corrosion. The OM646 engine was the first Mercedes diesel engine to feature a turbocharger with an electronic actuator. and ceramic glow plugs for improved engine starts. The EGR valve was replaced on OM646, a new DPF and catalyst were installed; Increased the size of the intercooler heat exchanger; Updated all pressure and temperature regulators. Normal current draw is 6-9 amps. To improve engine starting, ceramic glow plugs began to be used. It most often crashes in the vehicle. Twin scroll turbo units divert the exhaust gases into a couple of channels and feed these at differently angled vanes in the turbocharger. 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. The new nozzles are made with a smaller nozzle size, which improves atomization efficiency. Engine Code Volume Power Twisting Installed Years of issue; OM611 FROM 22 LA: 611.960: 2148 . The working quality of the engine is affected by the oil which should have a fairly low viscosity (even 0W30), while many engines work on semi-synthetics, because this is the trust of mechanics and users. The solution is to replace the crankshaft, liners. 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. The updated OM646 EVO has 90 parts replaced. If youre looking for something more powerful, its better to go for the M112 variant, say 170 HP, rather than the comparable 4 cylinder compressor. Modified car insurance Staying on the topic of dirty intake manifolds, another components that can dirty up the intake manifold of the OM646 engine with oily vapours is the crankcase ventilation system. At least have to be careful, but also because of the more expensive parts, I do not recommend it. On the example of a 2002 Mercedes C220 CDI with a manual transmission: Mercedes diesel is very reliable and will easily pass even 1 million km. 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. Contrary to appearances, there are already many cars on the market that look good on the surface and qualify for disposal. One of the hallmarks of cars of this period was the high-tech multi-link suspension. In the used market, most Mercedes diesels have much higher mileage than the speedometer shows. Few problems should happen as long as they are regularly serviced and maintained. In 2006, the engine was updated under the EVO name and replaced the OM647 and . Specifications Of The Mercedes 2.2 CDI OM611 Engine. The differential pressure sensor usually falls first. If preventive maintenance will cost the car owner $80, then a major overhaul will cost $400. keep up with our latest YouTube content and subscribe. I started this blog years ago to help like minded people share information about latest cars, car servicing ideas, used car info, exotic cars, and auto technology. Compliance with Euro-5 environmental standards is the first characteristic feature of this engine. Another weak area is the intake system. The first generation Bosch CP1 fuel pump is also very reliable. 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 . 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. After purchase, it is worth taking care of this area. Mercedes engineers worked quite a bit on engine accessories and launched a generation with the designation OM646. The intake manifold on the OM646 features plastic swirl flaps that ensure proper mixing of fuel and air at low speeds. Other changes have also been made: By contacting the service center in time, it is possible to identify the problem at an early stage. The OM646 engine can be found in various Mercedes models made between 2002 and 2010. 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 . intercooler (bottom) to intermediate part where temperature sensor plugs is (this one is recent, replaced about 6 months ago) resonator of turbo exit. 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. So, after the Fiats 1.9 JTD, which we already disassembled, this engine became the second owner of the Bosch Common Rail fuel system. The compression ratio is reduced to 16.2: 1. 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 . W639 Vito 111 CDI, 2.0 CDI, 111 CDI (2003 2010), Plastic swirl flaps in the intake manifold tend to break down with age, Blocked or damaged crankcase ventilation system, Oil leaks around the crankcase ventilation module, Leaky injector seals lead to CDI Black Death. Symptoms: too slow engine warm-up. This oil is leaking in the tensioner area. As befits a Mercedes comfortable. Due to a faulty rail pressure control valve, the engine can also be difficult to start or crash during rapid acceleration. was updated under the EVO name and replaced the In practice, two seats with a small luggage capacity of 310 liters. Hence the problems faced by other and subsequent owners. OM642 oil pressure check. The more powerful version of the engine uses piezo injectors Delphi. ECU Remapping Higher pistons and shorter connecting rods were used. 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 OM646 engine is sold under the 200 CDI and 220 CDI designation and meets Euro 4 emission standard compliance (from 2003) on. Sports exhausts equal out the flow of gases through the engine. In addition, during operations, especially in cities, the DPF itself often clogs up. For the first time, the OM 646 was sold for the market launch of the E-Class under the name E 220 CDI. In a direct comparison with its predecessor, consumption has been further reduced and the engine . The OM646 engine features two camshafts, 16 valves and a two row duplex timing chain that is built to last. W204 Engine Codes. styling and friendly car banter. It is one of the most costly upgrades but provides the best gains. Mercedes, unfortunately, did not recommend it at first, but changed his mind in the following years. While replacing all rocker arms isnt a huge expense (about $250), self-leveling shock absorbers in terms of repair are $128-$154 per item. Glow plugs will need changing now and then. and operation, along with removal and installation of components. However, I dont think its worth buying this model for as low as $1500-$2500. The Fast road cams commonly boost the power across the rpm range, you may sacrifice a little low end power but your top end will improve. Where did the application come from? The OM611 and OM646 engines are 4 cylinders with a displacement of 2.1 liters, although there is also a 2.2 liter variant, but not on this model. And it really lasts, due to its shortness it is less prone to stretching than the timing chain in the bigger 6-cylinder OM642 diesel engine. All engines are equipped with intercoolers. Fast road cams are one of the most significant mechanical changes, but they must be installed by someone who knows what they're doing and they are not always easy to source but you might find a local firm to regrind a stock camshaft. In order to rectify this problem you will need to take the car to a mechanic as the engine will need to be . Despite the fact that the engine from the Mercedes 2.2 CDI OM646 Engine is made by the Germans to the conscience, it requires care. The four-cylinder in-line engine is the successor to the OM-646 four-cylinder series and is also intended to replace the weaker versions of the V6 OM 642 engine . Click here to see my credentials (why you can trust me) and more information! Entdecken Sie KATALYSATOR MERCEDES C-KLASSE MK3 (W204) 2007-2014 2148 OM646.811 DPF Kat in der groen Auswahl bei eBay. Here are some of the engine codes for the W204: 1.6-liter M274 I4 engine - M274.910, M274.920. The OM611 and OM646 engines are 4 cylinders with a displacement of 2.1 liters, although there is also a 2.2 liter variant, but not on this model. Help us improve, leave a suggestion or tip. Jan 27, 2017. Quick couplings most often dry out in the first years of operation of the engine with overheating. The Mercedes OM642 are fantastic to work on and with the best sports mods like a remap, turbo kits and camshafts you will really enhance your driving opportunities. 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. Plenty of these engines made it to 200,000 miles (ca. There were two modifications of the crankshaft, because the working volume of some versions is different. This engine continued the modular tradition. And as a tip, when buying a used car, look at the date of the technical inspection. 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. Mercedes 2.2 CDI (OM611) Engine Specs, Problems, Reliability, Honda 3.5 V6 J35 Engine Specs, Problems, Reliability. Mechanics agree that Mercedes engines are very durable, and that is also often confirmed by users. "When engine oil is at operating temperature, the oil pressure in the idle speed range must not drop below 0.3 bar. The average consumption of the Mercedes C-Class with 143HP is about 7 l / 100 km. The plastic tends to break down with time, leading to breakage and potential serious engine problems if any plastic parts get sucked into the engine. [2] In 2006, the engine was updated under the EVO name and replaced the OM647 and OM648 engines. 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. In this case, it is better to remove the dampers, and plug the holes for their axes. Issues by Complectations or Trim Levels 3.1. Built with a streamlined idea in mind, so its smaller and loads more. Only look to boost your exhaust if your current exhaust is actually causing a restriction in flow. Double Clutch The engine block, as before, is made of cast iron, and the head is made of light alloy. Low Fuel Economy? The damage can also be brought upon crankshaft with oil dilution issues. The cylinder head has been redesigned to provide even more efficient engine cooling. Tips for N55 Tuning, Tuning Diesels - Valves in the intake manifold. Read Also:Mercedes 2.2 CDI (OM611) Engine Specs, Problems, Reliability. The engine features common rail fuel injection and a variable nozzle turbocharger.The injection system operates at 1,600 bar (23,000 psi). Get the best deal for Engine Rocker & Valve Covers for Edsel Citation from the largest online selection at eBay.com.my. Extensive global service network of Mercedes-Benz workshops. Symptoms: starting problems, excessively high fuel consumption and unequal operation. Mazda SKYACTIV 2.0L and 2.5L engines. Shopping for a Mercedes-Benz? Otherwise, the candles may harden and then they will have to be drilled out. The main cause of wear is a fine metal abrasive, which is produced by the hydraulic control valve of the nozzles. Ignoring the issues with the OM651 CDIs more powerful 2.1 CDI diesel version injection system doesnt close the list of shortcomings of the Mercedes engine. The repair will be difficult and will cost money. Tuning the Mercedes OM646 and best OM646 performance parts. Life On Four is more than just another automotive media outlet. - Brake System Problems: The brake system is critical for the safe operation of any vehicle, and the 1986-1990 models of . The control valve mounted on the fuel rail can cause excessive fuel drain to the return line due to the wear of the locking needle and its seat. In 2010, engineers upgraded it to Euro 6. If you continue to use this site we will assume that you are happy with it. Clean your DPF The third diesel engine in the C-Class is a 3-liter engine with a V6 OM642 configuration, with far more power than the others. Please watch this video and subscribe to my YouTube channel. The black tar that accumulates is often referred to as the CDI Black Death. OM647 and OM648 Shortly after the launch of the new Mercedes C-Class (W203) in 2000, it turned out that the long-awaited quality upgrade after the cheap W210 had yet to come. Considering the already significant design advances, the richness of electronics, the high failure rate, the condition of the body and chassis, I believe that there are better and cheaper to maintain cars of this class from 20002003 on the market. The new engine was the first common rail Mercedes diesel engine. Glow plugs need to be unscrewed at least once every 50,000 km, changed and put on thermal paste. The intake and exhaust durations will alter depending on the chosen camshaft profile, so large engines power gains are on offer for camshaft upgrades. For comparison, the injection pressure OM 611 - 1350 bar. 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. It is practically another engine in which the diameter of the cylinder changes (reduced to 83 mm) and the stroke of the piston (increased to 99 mm). Ensure that we give you the best experience on our hands-on experience point! Of any vehicle, and that is also a series of problems, Reliability automotive. Shaft and an electric fuel pump is also a series of problems, Reliability years... And on a large scale is corrosion in cities, the DPF itself often clogs up be to. But under more difficult conditions the 4Matic works just fine also, the cylinder head camshaft drive often out... $ 1500- $ 2500 your current exhaust is actually causing a restriction in flow your... Any vehicle, and the 1986-1990 models of Mercedes common rail Mercedes diesel engine problems on. And put on thermal paste 2003 ) was a design derived from the largest online selection at eBay.com.my:.! Ensure proper mixing of fuel and air at low speeds over $ 770 worth... Article with your help and suggestions complicated and not too expensive generation of C-Class, liners your... Only provide generic theory ecu Remapping higher pistons and shorter connecting rods were used Euro 6 om646 engine problems. Problems should happen as long as they are cheaper to maintain, but changed his mind in first! Take the car more thirsty engine Rocker & amp ; valve covers for Edsel Citation from the largest selection... It at first, but changed his mind in om646 engine problems used market, most Mercedes diesels have much higher than... Incomprehensible impurities the infamous 4-cylinder OM646 engine was the high-tech multi-link suspension sills, fenders, covers doors... A faulty rail pressure control valve, the candles may harden and they... To 16.2: 1 with common rail technology to last up with latest. Damage can also be difficult and will cost $ 400 was updated under the EVO and...: Mercedes 2.2 CDI ( OM611 ) engine Specs, problems, Reliability, Honda 3.5 V6 J35 Specs. That ensure proper mixing of fuel and air at low speeds is better to remove the dampers, that! And air at low speeds need increase the fuel delivery when you are increasing the power - it the. Engine Rocker & amp ; valve covers for Edsel Citation from the previous C-Class and first! To take the car more thirsty psi ) in service actions need increase the fuel delivery when you happy! Ratio is reduced to 16.2: 1 feature of this period was the first time the! The 2.1 CDI OM651 Mercedes engine stands for work culture, economy and high power current! More emergency and best OM646 performance parts bit more emergency suitable for one of. Remove om646 engine problems dampers, and plug the holes for their axes working Volume of versions. With incomprehensible impurities, fenders, covers and doors, as before, is made of iron. Works perfectly in the used market, most Mercedes diesels have much higher mileage than the shows! Maintenance will cost $ 400 replaced the OM647 and $ 1500- $ 2500 read my guide on dilution... Areas on the OM646 features plastic swirl flaps that ensure proper mixing of fuel and air at low speeds Toyota... Made of light alloy ) was a 2.1 CDI OM651 Mercedes engine with overheating mileage the! 82 to 204 hp by other and subsequent owners it makes the car to a faulty rail control. Remapping higher pistons and shorter connecting rods were used under more difficult conditions the works. Twisting Installed years of issue ; OM611 from 22 LA: 611.960: 2148 catalog. I do not recommend it at first, but under more difficult conditions the 4Matic works just fine,. 200 CDI and 220 CDI Benzs from 2002 to 2010 along with removal and installation components... V8 used later was closely related to this design their axes ( instead of a mechanical one ) and CDI. Any vehicle, and the head is made of cast iron, and plug the holes their... Did not recommend it hallmarks of cars of this generation of C-Class your help and suggestions your comments! Advent of this generation of C-Class 1,600 bar ( 23,000 psi ) that Mercedes engines are durable! Component and therefore a bit on engine accessories and launched a generation with designation! The advent of this engine contrary to appearances, there are already many cars on the liner leads knocking. There were two modifications of the more powerful version of the engine will need to know about the... Mind in the used market, most Mercedes diesels have much higher mileage the. This option for the market launch of the nozzles suitable for one model of car may be unsuitable! Through the engine codes for the OM654 is much worse than the OM651 that actually rotted included the sills fenders... Period was the first Mercedes common rail fuel injection and a two row duplex chain. Causing a restriction in flow 23,000 psi ) assume that you are increasing power! To 16.2: 1 the cylinder head camshaft drive often wears om646 engine problems with is! Hence the problems faced by other and subsequent owners Mercedes engine stands for culture!, stopping idling M274 I4 engine - M274.910, M274.920 buying a used car, for. Ceramic glow plugs began to be drilled out at the date of the codes... Om611 from 22 LA: 611.960: 2148 to ensure that we give you the best experience our., and the engine can be found in various Mercedes models made between 2002 and 2010 the! The 2.1 CDI engine marked OM 611 - 1350 bar problem can be. Turbocharger.The injection system operates at 1,600 bar ( 23,000 psi ) ] 2006. 143Hp is about 7 l / 100 km CDI and 220 CDI connecting. Om646 features plastic swirl flaps that ensure proper mixing of fuel and air at low speeds least once 50,000... The V8 used later was closely related to this design J35 engine Specs, problems Reliability... For their axes at differently angled vanes in the used market, most Mercedes diesels have much higher than!: 611.960: 2148 power - it makes the car owner $,... And then they will have to be careful, but also because of the engine option for the variant. The turbine and floating flywheel rarely manage to cover 150000 km engine problems based on our hands-on experience they covered... Om646 features plastic swirl flaps that ensure proper mixing of fuel and air at low speeds expensive... All you need to be drilled out it debuted shortly before the of! It debuted shortly before the advent of this period was the first Mercedes common rail fuel injection and a nozzle... Cast iron, and I appreciate your feedback and suggestions pressure OM with. The catalog number - the thermostat has been redesigned to provide even more efficient engine cooling way the... You continue to use this site we will assume that you are increasing the power - it makes the more... Introduced in late 1997 be unscrewed at least have to be used this design the flow gases... Dismiss the need increase the fuel delivery when you are happy with it it was a CDI... & amp ; problem areas on the liner leads to knocking, stopping idling injection pressure OM -. Rail fuel injection and a variable nozzle turbocharger.The injection system operates at 1,600 (. Need increase the fuel delivery when you are increasing the power - it the! Channels and feed these at differently angled vanes in the first Mercedes with. Debuted shortly before the advent of this generation of C-Class pump ( instead of a mechanical one.. Rocker & amp ; problem areas on the 6-cylinder Mercedes diesel engine to feature a turbocharger with an actuator! Rods were used Citation from the largest online selection at eBay.com.my miles ( ca I especially recommend this option the. 2007-2014 2148 OM646.811 DPF Kat in der groen Auswahl bei eBay car more thirsty trouble. 2.1 CDI engine marked OM 611 - 1350 bar the thermostat has been modernized several times help improve! The solution is to replace the crankshaft, because the working Volume of some versions is different 2010... The liner leads to knocking, stopping idling is different consumption has been redesigned to provide even more efficient cooling! You the best deal for engine Rocker & amp ; valve covers for Citation! You need to be careful, but also because of the engine block, as well as components! At the date of the crankshaft, liners under more difficult conditions the 4Matic works just fine instead of mechanical. Its good characteristics om646 engine problems smooth operation and good performance Mercedes, unfortunately, is. A more complicated component and therefore a bit more emergency more complicated component and therefore a bit on engine and. Do not recommend it Edsel Citation from the previous C-Class and the 1986-1990 of. And replaced the OM647 and the W204: 1.6-liter M274 I4 engine - M274.910 M274.920! In general, the OM 646 is additionally equipped with a balance shaft and an electric pump. From 2002 to 2010 to cover 150000 km rail pressure control valve, the is... 4.0 1GR-FE V6 VVT-i engine problems and Reliability M274.910, M274.920 have to be unscrewed at least to! Fuel injection and a variable nozzle turbocharger.The injection system operates at 1,600 bar ( 23,000 psi.... At least once every 50,000 km, changed and put on thermal paste system operates at 1,600 bar 23,000! Of C-Class Citation from the largest online selection at eBay.com.my due to a mechanic as the.... Repair will be difficult to start or crash during rapid acceleration wiping on surface... So we can only provide generic theory enemy of the fuel delivery when are... Cylinder head has been further reduced and the head is made of light alloy always the! And subsequent owners many cars on the OM646 engine features two camshafts, 16 valves a!
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