Working principle of diesel oil pump

1. When the eccentric wheel presses the rocker to drive the piston down, the pressure of the lower chamber increases because the volume becomes smaller, the oil inlet valve is closed, the oil outlet valve is opened, and the oil in the lower chamber flows to the upper chamber of the piston through the three-way.

2. The eccentric wheel leaves the push rod. Under the action of the pull back spring, the piston moves upward, the oil pressure in the upper chamber rises, the delivery valve closes, and the fuel is sent to the injection pipe. As the volume of the lower chamber becomes larger, the air is sucked in, and the oil inlet valve is sucked open, and the fuel is sucked into the delivery pump by the mailbox.

3. When there is air in the middle of the oil transfer pump, the diesel engine can not be started. At this time, the oil must be pumped by hand pump.