The fuel system of Deutz engine is like its “blood vein”, which plays a key role in the stable operation of the engine. Once the fuel system fails, the engine performance will be greatly reduced, and even can not work normally. Accurate diagnosis of fuel system failure is crucial to Deutz engine repair.
1. Low-pressure oil leakage
Adopt the method of drip can initially determine whether the low-pressure oil leakage. If the amount of fuel delivery meets the requirements, the probability of low-pressure oil leakage, at this time should check the following key components: fuel pump inlet pipe if broken, aging or loose connection, air will enter, interfere with fuel delivery, resulting in engine startup difficulties, unstable operation or even stalling; diesel engine power is insufficient, we must first check, clean diesel fuel filter element, which clogging will increase the fuel flow resistance; diesel fuel filter inlet pipe leakage will make the air mixed with the Fuel; hand oil pump is used for a long time, the internal seals are easy to wear out and cause air leakage, which affects the engine starting and running; blocked fuel tank vent will form negative pressure in the fuel tank, which prevents the fuel from flowing out; if there are cracks or pinholes at the welds of the fuel suction pipe of the fuel tank, air will be leaked into the fuel system, so pay attention to whether there is any abnormality at the welds when checking.
2. Governor failure
The governor is carefully adjusted and set by the manufacturer, which can automatically adjust the fuel supply according to the change of engine load and maintain a stable speed. Arbitrary adjustment will destroy the precise control, resulting in abnormal speed, affecting engine performance and reliability, unauthorized changes are strictly prohibited.
3. Smoke limiter failure
Smoke limiter is an important part that affects the performance of the diesel engine, and should not be changed arbitrarily. Its internal smoke limiters use the intake pipe air pressure to regulate the air - fuel ratio to control the exhaust smoke. Smoke restrictor damage, air intake pipe to the smoke restrictor air receiver leakage or blockage, as well as vacuum tube breakage, will lead to engine power, smoke increased.
4. Idle speed adjustment problems
Diesel engine low idle adjustment screw can be properly adjusted, if the low idle speed is set too low, the engine will be idling due to insufficient oil supply “swimming car” phenomenon. But the high idle speed adjustment screw can never be moved at will, otherwise the engine high speed oil supply is too large, may cause flying car, resulting in serious damage to the engine and even safety accidents.
5. Cylinder working condition check
Cylinder break method can be used to determine the cylinder working condition, in turn, disconnect the cylinder injector oil supply line, if you disconnect a cylinder injector, the engine shaking intensified, the speed does not drop significantly, the cylinder may have a fault. Determine the fault cylinder, remove the injector debugging, check whether more sealing copper gaskets, can also be connected to the injector outside the engine, observe the spray atomization, pressure and other parameters to determine the fault.
6. Returning Oil Inspection
In the rated speed to check the diesel engine oil return volume can determine the oil circuit problems. Too much fuel return, may be the injector seal is not tight, high-pressure oil pump failure; back to the oil volume is too small, may be the oil circuit blockage, oil pump oil supply is insufficient. Monitoring and analyzing the fuel return volume is an important clue for fuel system troubleshooting.
Deutz engine fuel system fault diagnosis needs to strictly follow the process, Deutz engine repair needs to use professional tools and experience to accurately locate the fault. Daily maintenance should also be done, regularly check the diesel filter, fuel tank vent and other components, and pay attention to the engine operating status. Only in this way can we guarantee that the fuel system runs well, so that the engine can output power stably and efficiently in various fields.
