CHARACTERISTIC FAULTS OF FUEL SUPPLY PUMPS DURING OPERATION
Fuel priming pumps (HPP) are designed to supply fuel with excess pressure to overcome resistance in fuel filters and ensure filling of sub-plunger chambers in a high-pressure fuel pump (HPP) at various engine operating modes. Over time, various malfunctions occur in the TVC, which manifest themselves with a decrease in the fuel pressure supply. In accordance with the results of studies carried out at TsNITA, the share of failures of the TVC of the fuel pump UTN-5 is 4.2% of failures. In this regard, the characteristic faults of the TVC during operation were analyzed. It is shown that the defining parameter for the value of productivity and maximum pressure of the piston-type TVC is the clearance in the systems «piston - housing hole» and «pusher rod - guide hole». In addition, the operation of diesel fuel equipment (TA) in the absence or faulty coarse filters causes the penetration of various mechanical particles into the booster pump. Jamming of these particles in the engine systems leads to partial or complete seizure of moving parts, and, as a result, to partial or complete pump failure. Thus, timely and high-quality performance of the maintenance operation of the low pressure fuel system will ensure uninterrupted operation of the diesel engine.