How Should You Repair Cummins Engine When It Smokes Heavily

Cummins engine repair is a headache, in the process of your use, Cummins engine may have appeared in the phenomenon of thick smoke, this problem should be how to repair it? We should analyze the specific problem. In this article, we will start from two situations, for you to explain in detail.

1. Cummins engine white smoke

The first thing that needs to be clear is that each diesel engine has the phenomenon of white smoke, which is normal, but when the amount of white smoke is too much, it is necessary to consider whether the engine is the following failures.

（1）Fuel problem. Low-quality fuel, too much fuel supply will produce a large amount of smoke, low-quality fuel will lead to incomplete combustion, producing a large amount of smoke and particulate matter, which leads to white smoke from the exhaust. The solution is to choose high-quality fuel and clean the fuel system regularly; if too much fuel is supplied, it will lead to incomplete combustion and produce too much smoke. The solution is to adjust the fuel supply system to ensure that the amount of fuel supplied is reasonable.

（2）Engine problems. If there is blockage or damage to the air intake system, it will lead to insufficient air flow, which will cause incomplete combustion and produce white smoke from the exhaust. In addition, carbon and oil residue in the combustion chamber will also affect combustion efficiency, resulting in white smoke from the exhaust.

（3）Ambient temperature problem. In a low-temperature environment, the evaporation and combustion of fuel will slow down, resulting in incomplete combustion, resulting in white smoke from the exhaust; in a high-temperature environment, the engine's heat dissipation may not be good, resulting in overheating of the engine, resulting in white smoke from the exhaust.

2. Black smoke from Cummins engine

Cummins engine black smoke situation is more complex, can be checked from the following aspects:

（1）If the engine suddenly black smoke, but run for a period of time after the failure of natural disappearance, is mostly due to poor fuel quality, due to impurities in the oil plugging injectors to poor injection quality, black smoke exhaust, run for a period of time after the impurities are high-pressure oil flushed out, this failure does not need to be dealt with.

（2）If the continuous exhaust black smoke, consider checking whether the air intake is smooth, whether the intake pipe is deformed to increase the resistance to air intake. First remove the air filter cover, remove the filter element and clean up the maintenance and retry the machine, observe whether the exhaust pipe continues to exhaust black smoke. If the smoke is significantly reduced, the air filter is too dirty or installation problems, affecting the air intake, should strengthen the maintenance of the air intake system.

（3）The injection quality of most injectors has seriously deteriorated, the fuel atomization is poor, can not adapt to the needs of the shape of the combustion chamber, resulting in the formation of combustible mixture is difficult, part of the fuel is converted into free carbon is discharged. This is also one of the causes of black smoke, so should also be checked and repaired injector.

（4） Check whether the fuel quality is up to standard, should be used in line with the engine in the ambient temperature of the region under normal operation of the standard diesel fuel.

（5） If the above are normal, and the engine has been running for a long time, you can consider checking the valve opening height and opening time is correct. Prolonged use can make the valve transmission components wear, normal gas distribution phase and valve lift inaccuracy, reduced intake, the amount of residual exhaust gas in the cylinder increases accordingly, directly affecting the full combustion of fuel.

Cummins engine repair is a responsible thing, there may be a variety of reasons for the failure, if you check the above situations or not find the root cause of the problem, you can go to the official website of Keluo Construction Machinery to seek help, our official website has a multitude of professional knowledge about the engine, and the sale of new and used original parts, where you can If you have the intention to buy, or have other questions, welcome to contact us, our customer service will reply promptly.