4 Warning Signs That a Diesel Engine Needs a Repair Auto Repair by Auto5097 - December 22, 20220 Several warning signs indicate your diesel engine needs repair, depending on your model. The main ones are oil sludge in the engine compartment, blue smoke from the exhaust, and black smoke from under the hood. Blue Smoke From the Exhaust Getting blue smoke from your exhaust may indicate that your engine needs a repair by diesel engine technicians San Jacinto, CA. However, it is not the kind of smoke you usually see. Instead, it is a symptom of oil burning in the combustion chamber. An oil leak is the most common cause of blue smoke from your exhaust. An oil leak can occur internally or externally. It is common in high-mileage vehicles. You should inspect your engine for oil leaks and clean it with a drain back hole. A leaking head gasket can also cause blue smoke. In some cases, a blown turbo can also cause blue smoke. These types of issues are a lot more costly to fix. You may need to replace the cylinder head and engine. Other things that can cause blue smoke from your exhaust include broken piston rings, a dirty engine, and a PCV valve that isn’t working properly. All of these issues can cause your engine to burn more oil. Oil Sludge in the Engine Compartment Whenever you’re looking at the engine compartment of your vehicle, if you see black splatters on the outside of the engine, it’s a big warning sign that there is a problem with the engine. This is because sludge builds up on the engine over time, causing it to clog up its workings. Sludge can also cause an engine to smoke or even overheat. Engine sludge can be very difficult to remove from the engine. To remove the sludge, you may need to use special tools. You may also need to have the engine completely disassembled. If the engine is severely sludged, you may even have to replace the engine. It’s a good idea to perform regular oil changes and to have the engine professionally cleaned to avoid this problem. In addition, synthetic motor oil can help protect your engine from stress. Finally, if you find sludge, the easiest way to remove it is to use a chemical engine sludge remover. Black Smoke Coming From Under the Hood Seeing black smoke in a diesel engine is not a pleasant experience. But it can be a sign that the engine needs repair. Thankfully, there are many things you can do to help prevent this from happening. The best way to prevent black smoke from forming is to clean your air filter. This will help the engine breathe better. If you have a dirty air filter, it will prevent air from flowing through your engine. Unfortunately, it also causes a solid carbon residue to build up. Another way to fix black smoke is to adjust the timing of your air injectors. This will ensure the right amount of fuel is being burned. A fuel injection system problem can also cause check engine lights to light up. Again, a qualified technician can help you diagnose the issue and repair the problem. A faulty oxygen sensor is also a major cause of black smoke. In addition, a bad sensor will cause your engine to run less efficiently and result in high fuel consumption. Compression Loss During engine operation, compression is needed to transfer energy from the combustion gasses into mechanical energy. It also helps to make sure that the engine can operate properly. Compression loss in the engine can cause the engine to run rough and lack power. It can also cause the engine not to start. Some different components in the engine can cause low compression. One common cause is worn piston rings. They will not seal against the cylinder walls properly, allowing carbon gases to leak through. It can also be caused by overheating. As a result, the cylinders can overheat and crack the piston. If compression loss occurs in all of the cylinders, it may be a symptom of an internal engine problem. These internal engine problems include a broken camshaft, timing belt, and rocker’s arm. A blown head gasket may also cause it. A blown head gasket may leave a small hole between the cylinder and the head, which allows gases to escape. A leaking valve seat or spring can also cause loss of compression.