Deutz Diesel Engine Slows Down Seriously

Fault phenomenon: The diesel engine starts normally and works normally at high and low idle speeds. When the equipment is under heavy load, the speed drops seriously, the speed drops to about 1100~1300rpm, and the vehicle speed is also low, but it returns to normal after working for a short period of time.

Troubleshooting process: Check the fuel system pressure and flow, and find that the pressure and flow are both low. Check the fuel system pipelines and filters, and find that there is foreign matter stuck in the hand oil pump. After clearing it, it returns to normal.

Analysis of the reasons: The diesel engine starts normally, and the high and low idle speeds work normally, indicating that there is no fault in the electrical part of the diesel engine, and the fault point should be in the fuel system. The blockage of fuel system pipelines and filters affects the normal fuel supply of the diesel engine, causing the pressure in the low-pressure oil circuit to build up slowly, resulting in less fuel supply to the cylinder, low fuel supply pressure, poor atomization, and low diesel engine power. It can usually return to normal after solving the problem of clogged fuel system pipes and filters. In addition, a faulty fuel pump can cause the same phenomenon. You can judge whether the oil transfer pump is working normally by checking the diesel oil line pressure (>5bar) and flow rate (>8L).

Suggestion: When the diesel engine is started after a long interval, it takes a certain amount of time to build up pressure in the low-pressure oil circuit. If it immediately enters heavy-load operation, the output power will be low. It is recommended that the equipment starts working in the medium-speed zone with no load for about 20 seconds after startup.