Analysis Of The Causes Of Diesel Engine Underpowered Failure II

There are a few other reasons for the lack of power in a diesel engine: 

     First, the timing of the injection pump improper oil supply

    Due to improper adjustment of diesel injection pump fuel supply timing, injection pump wear and tear, etc., will cause the injection pump fuel supply timing is too late, thus delaying the entire combustion process backward, usually called "after combustion". At this time, part of the fuel is not enough time to fully combust will be discharged from the cylinder, so that the fuel energy can not give full play to and use of the diesel engine power shortage, which produces diesel engine black smoke, parts and components heat, exhaust gas temperature is too high, serious exhaust pipe will be sparks and other situations. At this time, should check and adjust the oil supply timing. If the plunger vice, oil valve vice wear is too large, should be repaired or replaced in a timely manner.

    Second, poor injector injection performance

    Diesel injector needle valve stagnation, spray hole blockage or cracking, broken injector springs or elasticity disappears, injector spring adjustment is too tight or too loose, the plunger vice, the outlet valve vice, needle valve vice wear and tear is too large, the fuel system of the low-pressure oil circuit blockage and other reasons, will cause poor atomisation of the injector or dripping oil and other conditions, so that the fuel combustion is incomplete, resulting in a decline in diesel engine power. At this time, the main feature of the diesel engine is black smoke, should be repaired or replaced in a timely manner.

    Third, the fuel system insufficient oil supply

    Fuel system oil supply problems have "plugging" and "leakage" 2 aspects. The so-called "plug" is due to long-term maintenance, resulting in diesel fuel filters and pipelines are partially blocked by dirt, so that the oil supply resistance increases, oil supply is not smooth. If the diesel engine in the case of small load less oil, oil supply can also meet the requirements, but in the case of large load large oil, oil supply can not meet the requirements, 'thus causing a decline in diesel engine power. Therefore, in order to ensure that the oil supply system is smooth, it must be maintained in accordance with the regulations. The so-called "leakage" is from the oil tank to the oil pump of the low-pressure oil leakage. Similarly, in the case of small load less oil supply enough, in the case of large load large oil, due to air leakage so that the low-pressure oil circuit inhalation of air, resulting in insufficient oil supply, resulting in insufficient diesel engine power failure occurs. "Leakage" often occurs after repair and maintenance, in the maintenance of the disassembly of diesel fuel filter and piping, assembly, if the joints are not sealed tight or filter installation seals are not closed tightly, will result in "leakage" of the fault.

    At the same time, the injection pump plunger vice or oil valve vice wear and tear is too large, clogged holes, needle valve stagnation and other reasons, so that the injection pump oil supply is insufficient to meet the requirements of the diesel engine load increase will also lead to insufficient diesel engine power. The resulting lack of power, will not cause damage to diesel engine parts, the user will feel the diesel engine work powerless, speed can not be increased, the temperature of the heated parts and exhaust gas temperature is low. Found that such a situation, should check the causes of insufficient oil supply, timely exclusion.

    Fourth, poor governor

    Diesel engine governor due to improper assembly and adjustment, governor spring pressed too tight or broken, weakened elasticity and other reasons, so that the governor to promote the injection pump rack to move the force is too small, resulting in the injection pump is difficult to increase the amount of oil supply, will also cause the diesel engine power shortage. In this case, the obvious characteristics of the diesel engine is more difficult to accelerate, slow speed increase; deceleration is easier, faster speed reduction, and the diesel engine speed is not stable. At this time should check, adjust or replace the governor spring. In addition, if there is no obvious change in the power of the diesel engine, just from the dashboard engine tachometer to observe the maximum speed does not go, then it is generally caused by the generator belt loosening. Because some diesel engine tachometer is connected to the tachometer by the generator all the way to the firewire, detected is the generator's speed, after the pulley speed ratio conversion, in the instrumentation marked engine speed. Therefore, the belt is loose, will cause the engine speed indication error. Do not mistake this fault as a fault of insufficient engine power, tighten the generator belt, the fault will be solved. Maintenance needs to replace the generator assembly, should pay attention to the replacement of the new generator pulley diameter should be the same as the old generator, otherwise it will also cause the engine speed indication of the illusion of error.

    Fifth, lubrication and cooling system work poorly

    Due to the failure of the diesel engine lubrication system, resulting in insufficient oil or interruption, oil is too dirty, with too large or too small a gap, diesel engine overheating and other reasons, so that the relative motion of the parts of the lubrication is poor, then the friction loss of power increases, resulting in a reduction in the output of diesel engine power, when the diesel engine burns or cylinder accident, the friction of the loss of power dramatically increased, the output of diesel engine power drastically reduced, and in serious cases will cause the diesel engine stops on its own. When the diesel engine burns or pulls the cylinder accident, the friction loss power increases sharply, the power output of the diesel engine decreases sharply, and the diesel engine stops on its own. Due to poor lubrication caused by the lack of diesel engine power, there are several obvious characteristics. That is, the diesel engine parts are hot, the oil temperature rises, when serious, can smell the smell of burnt oil, diesel engine issued an abnormal dull sound. At this time, the diesel engine should be reduced or unloaded, so that it is running empty at low speeds, in order to find the cause of the exclusion. At the same time, if there is too much oil in the crankcase, so that the oil level is too high, the crank linkage mechanism of the movement resistance increases, the power consumption increases, will also cause the diesel engine power shortage.