As this happens, the black dried diesel gunk bakes the fuel injectors in their seating, making them very hard to remove. ![]() Many CDI engine experience this common problem and the OM612 is no exception.ĭue 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. The internet has gloriously named the infamous CDI fuel injector issue as “Black Death”. “Black Death” CDI fuel injector seal failures If you’re lucky, they get stuck in the open position, and you won’t even know there’s something wrong. The carbon deposits can block the movement of the swirl flaps. Short journeys can quickly coke up these engines, which leads to carbon build up in the intake manifold and all over these plastic swirl flaps. Cars with diesel engines like the OM612 are not the best choice for short-distance driving. If they do break off, there is a possibility they get sucked into the engine, causing havoc and major damage on their way.Īnother problem is carbon and oil deposits. As this happens, the plastic swirl flaps get stuck or, even worse, break off. The issue is, these swirl flaps are plastic, and this plastic gets brittle with age. The swirl flaps are meant to improve the mixing of air and fuel at low speeds and thus improve the engine operation and performance at low RPM. ![]() Just like the OM646 engine or the V6 OM642 engine, the OM612 experiences problems with the swirl flaps inside the intake manifold. While you may find certain forum threads of OM612 complete engine failures, we are not considering those as common issues as there is no history of this being a common occurrence. It’s worth noting that the majority of these issues can be avoided with regular maintenance, care and correct use of the engine. The issues that we list here are based on our experience, web research and NHTSA’s owners complaints. What was the commercial name of the OM612 engine?Ĭommon Mercedes OM612 (270 CDI) Engine Problems
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