Hi All, I'm looking for some advice on a potentially blown 2014 MN 2.5TD motor. My car has done 150,000Klm. The original motor was replaced at around 27,000klm under the cooling system campaign due to overheating, with a brand new long motor.
About a week ago I was driving to work going up a hill at about 100 kph (vehicle was unloaded with just me it) when it lost power and started blowing black smoke from the exhaust. There were no bangs or loud noises when this happened, just a loss of power and the smoke from the exhaust. I coasted the car down the other side to a service station and shut down the engine. I have an OBD2 reader which gave me an engine code of P0304 - Cylinder 4 - Misfire Detected. Once restarted the engine ran very rough and did not rev well. I had the car towed to a mechanic who did a few tests and his opinion is that a full rebuild is required ($11.5K). He did not remove the head but was confident that it would need a full rebuild from his experience with these engines. He did say that a pressure test of the radiator indicated a head gasket leak and it was running on 3 cylinders. I still need to get a report from him on the tests carried out. Intake/intercooler pipes were not leaking and no load noises when this happened (I have had the turbo to intercooler pipe split before so I know what that sounds like).
This motor was running fine up until this point. The only things that I had noticed recently was that it was blowing some black smoke on take-off. It had no overheating issues and did not suffer any of the symptoms I encountered with the original motor (varying coolant levels etc.).
Has anyone else had a similar experience to how this engine failed? I was thinking possible blown head gasket or injector, but not a total rebuild, especially considering that this was a replacement motor. Any advice would be appreciated. My next step will be to get a mechanic to remove the head so the problem can be properly diagnosed, but just curious as to whether this kind of issue has happened to anyone else and what the problem was.
Cheers