Common gasoline engines and diesel engines belong to reciprocating piston internal combustion engines, which convert the chemical energy of fuel into mechanical energy of piston movement and output power to the outside world. Gasoline engine has the advantages of high speed, low quality, low noise, easy start and low manufacturing cost. Diesel engine has high compression ratio and high thermal efficiency, and has better economic performance and emission performance than gasoline engine.
Extended data:
Maintenance method of diesel engine hot car;
Step 1: Select suitable oil to prevent corrosion.
Because the compression ratio of diesel engine is more than twice that of gasoline engine, its main components are subjected to high temperature and high pressure impact much more than that of gasoline engine, so the materials of components will be different. For example, the bearing bush of gasoline engine can be made of Babbitt alloy, which is soft and has good corrosion resistance, but the diesel engine must be made of high-performance materials such as lead bronze or lead alloy, which has poor corrosion resistance.
Therefore, more corrosion inhibitors should be added in the refining process of diesel engine oil to form a protective film on the surface of bearing bush and reduce the corrosion of bearing bush. In addition, the sulfur content of diesel oil is greater than that of gasoline, and sulfur will form sulfuric acid or sulfurous acid in the combustion process, which will rush into the oil pan together with high temperature and high pressure exhaust gas to accelerate the oxidation and deterioration of engine oil. Therefore, it is necessary to add some antioxidant additives in the refining process of diesel engine oil to make the engine oil alkaline.
Step 2: Strengthen the maintenance of the filter?
In order to prolong the service life of diesel engine, it is necessary to strengthen the maintenance of air filter, oil filter and diesel filter and give full play to their functions. When installing the air filter, you must not miss, reverse or misplace each sealing washer and rubber connecting pipe, and ensure the tightness of each press-in place.
If the engine oil filter is not maintained in time, the filter element is blocked, the oil pressure rises, the safety valve opens, and the oil directly flows into the main oil circuit, which will aggravate the wear of the lubricating surface and affect the service life of the diesel engine. The fuel filter in the diesel oil supply system should be replaced every 10000 km/time according to the oil quality, and the fuel tank and all oil pipelines should be thoroughly cleaned regularly. ?
Step 3: refuel carefully and beware of sulfur poisoning?
Be careful when choosing a gas station. It is best to refuel at a gas station with good reputation for a long time. If inferior oil is added, it will block the injection hole and wear the inside of the oil pump, resulting in damage to parts and abnormal operation of the engine, and the prices of the nozzle and high-pressure oil pump are quite amazing even for ordinary diesel vehicles.
In addition, if consumers accidentally add diesel oil with high sulfur content, the sulfur contained in it will form sulfur dioxide after combustion, which will combine with the water contained in the fuel to become sulfuric acid, which will not only make the engine oil acidify rapidly, but also corrode oil seal gasket and other parts, leading to engine oil failure and serious damage.