Repairing High Fuel Consumption in Cummins Engines

Fuel consumption rate, or fuel consumption for short, is the most important indicator of the fuel economy of the engine itself. How much fuel consumption is considered normal? This depends on the model, the vehicle's fuel-saving technology, driving habits, specific working conditions, etc. Generally speaking, the larger the displacement of the vehicle, the higher the fuel consumption will be. When the engine is running, if the fuel consumption is too high, it is often accompanied by the phenomena of weak acceleration or hill climbing, unstable operation, black smoke from the exhaust pipe and misfiring. For this situation, we need to carry out fault analysis and troubleshooting to find out the cause and solve the problem.

1. Some factors affecting fuel consumption

Excavator as a general earthwork equipment, it has a wide range of work, the object of operation and operation mode are many kinds. For example, in the earth excavation, because there is the size of the project, the softness of the soil, digging and unloading loading method, the operator's operating habits and proficiency, the size of the engine throttle and other different conditions of use, so even if the same amount of earth, the amount of work consumed is different. The larger the volume of work, the harder the soil, the less smooth the loading or unloading method, the less standardized and skilled the operation, and the larger the throttle, the more diesel fuel will be consumed. At the same time other accessories such as motor, air conditioning use, will also have an impact on the engine fuel consumption. In addition, not using the regular three filters and oil, resulting in early wear and tear of the engine, the power drop will also cause excessive fuel consumption.

2. Repair methods for high oil consumption

When the oil consumption of Cummins engine is found to be high, the following methods can be used to check and repair.

(1) Check the engine temperature: If the engine temperature is too high, it will increase the oil consumption of the engine. Ensuring that the engine is working at the right temperature can reduce fuel consumption.

(2) Check the air-air flow meter: the air-air flow meter detects the air intake and if it is damaged, the fuel consumption will increase. It needs to be checked or replaced at a workshop.

(3) Check the spark plugs: spark plugs in good or bad working condition directly affects fuel consumption and engine performance. Need to go to the workshop to check and replace.

(4) Clean up the engine carbon: too much carbon in the engine will also lead to increased fuel consumption, you need to clean up the carbon in the engine.

(5) Check tire pressure: tire pressure is not normal, will also lead to increased fuel consumption, you need to regularly check and adjust the tire pressure.

(6) Avoid prolonged idling: prolonged idling will not only increase fuel consumption, but may also damage the engine, you should avoid prolonged idling.

(7) Incorrect fuel injection timing angle. Generally caused by wear and tear of the injection pump, the timing angle should be adjusted in time. Along the high-pressure pump rotation direction reverse rotation pump body for ignition angle advance; along the high-pressure pump rotation direction downward rotation pump body for ignition angle lag.

(8) The valve spring is too soft or the direction of the spring is installed in the opposite direction, will cause the air chamber sealing is not good. Should be timely inspection and replacement of springs, valve springs are unequal pitch springs, the correct installation is under the dense on the loose, so long as the installation is to avoid resonance, affecting the sealing of the valve seat.

The above points are common reasons for high fuel consumption of Cummins engine, in the usual process of using the car, pay attention to the above points, you can effectively reduce the engine fuel consumption. If you still can't identify the cause of high oil consumption of Cummins engine after investigation, it is recommended to check and repair by Cummins designated maintenance service station, and keep the relevant maintenance records.

If you want to know more about Cummins engine maintenance, troubleshooting or specifications, Construction Machinery has various information on its official website.