What Causes the Oil Pump to Fail?

[DiKayden]

The following are the reasons for oil pump damage: 1. Wear between the plunger and plunger sleeve: During operation, mechanical impurities in the fuel enter the injection pump chamber, causing abrasive wear. Combined with the corrosive effect of the fuel, this increases the gap between the plunger and sleeve. 2. Wear of the delivery valve: High-speed flow scouring by mechanical impurities in the fuel causes wear on the delivery valve, pressure relief band, or valve seat, leading to poor sealing and insufficient residual pressure in the high-pressure fuel line. Additional information on the causes of damage: 1. Failure of the delivery valve spring: Fatigue reduces the spring force of the delivery valve, impairing its one-way shut-off function and causing backflow. 2. Insufficient pressure in the low-pressure fuel line: Reduced or no pumping capability of the fuel supply pump, clogged diesel filters or fuel lines, or air entering the fuel system can decrease the fuel pressure in the low-pressure line of the injection pump, preventing pressure generation. When the injection pump operates, fuel cannot quickly enter the pump chamber, resulting in no or insufficient fuel injection.