Although the application rate of LNG heavy truck in the transportation market has been higher and higher, for most card users, LNG heavy truck is still slightly “mysterious” compared with traditional fuel heavy truck. Even the old drivers who have driven LNG heavy trucks still have many misunderstandings about vehicle repair and maintenance.
So what are the differences in maintenance between LNG heavy truck and fuel heavy truck ?
Before answering this question, we must understand a fact: the difference between LNG heavy truck and fuel heavy truck only lies in the fuel supply system, ignition mode and fuel storage mode of the engine.
Because LNG engine has more ignition system and fuel premixing system than diesel engine, LNG engine will be relatively complex during daily maintenance of lng heavy truck.
The first thing to note is that special engine oil must be used for the maintenance of LNG engine.
Because the temperature of LNG engine is high during operation, special high temperature resistant engine oil is required. In addition, LNG engines have high requirements for sulfate ash content, detergent dispersant ratio, corrosion resistance, oxidation resistance and so on.
If you don’t pay attention to the maintenance and still choose the engine oil at will like the maintenance of diesel engine, it is easy to cause oxidation and carbon deposition in the engine combustion chamber due to high temperature, resulting in increased emission of harmful substances of lng heavy truck.
In addition, the high ash additives of ordinary engine oil can easily form hard deposits on the surface of engine parts, resulting in abnormal engine wear, spark plug blockage or valve carbon deposition, which will lead to engine detonation, valve fire or ignition loss, resulting in engine power decline, unstable power and even shorten the service life of the engine.