You may hear some clatter on startup as the tensioners are hydraulic and require the oil system to be pressurized (takes a 1-2 seconds). To add to this, I recently moved from a W203 C350 (petrol) to a facelift W204 C350 (diesel). Finally the rattling noise is now constant and the van is hard at starting. Helps to have the correct tool! Fancy only using a single row chain. It's only a wimpy little single row chain so it stretches. All these codes are the result of coolant getting into the vacuum system. Codes P0299FB and P0299FA are both boost pressure codes that may indicate the coolant has reached the boost pressure control valves. We’ll go over what is happening, causes and repair procedures in this article. We have seen an increasing number of 4-cylinder powered Sprinters (OM651 engine) experiencing coolant loss, "limp-home mode", and eventual widespread engine issues ranging from temperature control problems to power loss. I would check the whole Exhaust system, including the manifold as tooth fairy stated. And what is the symptom of this problem? I'm guessing he's suggesting avoid the 200. The vacuum system itself, including the reservoir and pump, will also be affected. Best wishes ! The sound increases while increasing the rpm regime. All of the codes caused by problems mentioned in this text can be scanned by a good Mercedes OBD2 scanner. This is a stunning “common rail” diesel engine, among the first to mount a piezoelectric fuel injection system by Delphi. I have heard that the sprinter ncv3 with om651 engines have a pproblem. The OM651 in various states of tune is almost ubiquitous across the Mercedes range from the A class to the CLS/ ML. to check for leaks. Replacements will break again. Economy is averaging about 38mpg, which is a 34 miles commute each day along the A3/M25 and a little bit in town, although it is dropping and I expect it to even out to about 36mpg. Problem with the OM651 is the timing gear is at the rear of the engine, so if extensive work is required its an engine out job I think. The 350CDi or the V6 petrol if you can find one, if you want a balance of performance, refinement and reasonable economy. Whatever problems or symptoms you are experiencing, avoid guessing. Mercedes-Benz makes some of the best diesel engines out there. I had a C220 estate, albeit a 2013 plate, I loved everything about it. Check the DPF and the brackets thoroughly. Mines also a Sport with 18" wheels and a lower ride height so a reduction in ride quality is perhaps not an enormous surprise. The first symptoms of water pump failure and coolant getting into the water pump vacuum diaphragm is loss of temperature control. Lets hope there's an insitu fix or modification [ duplex chain??] But exhaust system cracking galore. Someone knows something about it? Any idea if this man is right as this job is huge to undertake? Mine had the upgraded 14 speaker stereo. In all best car I've ever owned. I'd pull the engine to make it easier but I'm old. Common codes related to this problem: P0003313 - Charge Air bypass flap… You can also slightly pressurize the vacuum system (do not exceed 14 PSI!) Several indies reporting more high mileage OM651 ENGINES with timing chain problems OM651 diesel engine - Mercedes-Benz Owners' Forums . I hear a buzzing in the engine, I take apart the accessory belt and continue doing it. We have seen an increasing number of 4-cylinder powered Sprinters (OM651 engine) experiencing coolant loss, “limp-home mode”, and eventual widespread engine issues ranging from temperature control problems to power loss. The impeller can move into and out from a shield, which decreases and increases coolant flow, respectively. The vacuum system controls the turbocharger actuator, boost actuator, heater control in the cabin air system and brake booster, so all these are affected once coolant contaminates the vacuum system. Leather, navigation and heated seats. In order to help engine warm-up, Mercedes uses a water pump that has a movable impeller. Unless you have the budget for a V8, Yes, sorry. Oh and talking of front pads and discs MB wanted £460 but my local garage did it for £207!!! © 2020 Pistonheads Holdco Limited, All Rights Reserved.