1. When the diesel engine operates with insufficient engine oil
At this time, insufficient oil supply will cause insufficient oil supply to the surfaces of each friction. pair, resulting in abnormal wear or burning. For this reason, it is necessary to ensure a sufficient quantity of engine oil before starting the diesel generator and during operation of the diesel engine, in order to avoid cylinder drafts and tile combustion failures due to lack of oil.
2. Emergency shutdown with load or shutdown immediately after sudden removal of the load
After the diesel engine generator stalls, the circulation of cooling water stops and heat The dissipation capacity decreases sharply. If it decreases, the heated parts lose their cooling, which can easily cause overheating of the cylinder head, cylinder liner,of the cylinder block and other mechanical parts, produce cracks or cause excessive expansion of the piston and blockage in the cylinder. lining. On the other hand, if the diesel generator is stopped without idling to cool, the friction surface will be insufficiently oily. When restarting the diesel engine, poor lubrication will worsen wear. Therefore, before the diesel generator stalls, the load must be discharged, the speed must be gradually reduced, and the engine must run without load for a few minutes.
3. Operating under load without warming up the engine after a cold start
When the diesel generator starts cold, due to the high viscosity and poor fluidity of the engine oil, it is The oil pump does not supply enough oil, and the friction surface of the machine is poorly lubricated due to lack of oil, causing rapid wear and tear.even breakdowns such as cylinder tearing and tile burning. Therefore, after the diesel engine has cooled and started, it should be run at idle speed to warm up, and then run with load when the idle oil temperature reaches more than 40°C, the machine should be started in low gear and ride while; a certain mileage in each gear sequentially until the oil temperature is normal and the oil supply is sufficient. After that you can move on to normal driving.
4. Accelerate the diesel engine hard after a cold start
If the accelerator is pressed hard, the speed of the diesel generator will increase sharply, causing some friction on the machine. The surface is heavily worn due to dry friction. Additionally, when the accelerator is struck, the force received by the piston, connecting rod and crankshaft changesge considerably, causing violent impact and easily damaging parts.
5. Operation when cooling water volume is insufficient or cooling water and engine oil temperatures are too high
Insufficient generator cooling water volume diesel will reduce its cooling effect. , the diesel engine overheats because it cannot be cooled effectively; If the temperature of the cooling water and engine oil is too high, it will also cause the diesel engine to overheat. At present, the cylinder head, cylinder liner, piston components and valves of the diesel generator are mainly subjected to large thermal loads, and their mechanical properties such as strength and toughness decrease sharply, increasing the deformation of the parts, reduces the assembly clearance between parts and accelerates the wear of the parts, dIn severe cases, cracks and machine parts can become stuck. Overheating of the diesel generator will also aggravate the combustion process of the diesel engine, causing the injector to operate abnormally, causing poor atomization and increased carbon deposits.