The internal surface of the 1. marine water pump and the inner surface of the pressure water chamber (also known as the volute) are rusted and uneven. Surface corrosion bump will reduce the pump water volume by 7%-8%; Only steel brush and iron sandpaper or grinding wheel need to be polished smoothly during maintenance, which can reduce the fuel consumption or power consumption by 9%-14% during work.

2. seal ring gap increases. According to the test, when the clearance in the radius direction of the impeller is increased by 4mm, the pump water volume will be reduced by 10%. During maintenance, only organic adhesive and asbestos thread need to be used to restore the clearance specified in the factory, so that the oil consumption or power consumption of the marine water pump can be reduced by 10%-12%.

The axes of the 3. pressure water chamber and the impeller do not coincide. According to the test, when the deviation between the axis of the pressurized water chamber and the impeller is 2mm or the deviation angle is greater than 2 degrees, the pump water volume will be reduced by 5%-6%; During maintenance, the oil or power consumption of the pump during operation can be reduced by 6%-7% by carefully measuring and carefully locating the position where the axes coincide.

4. blade installation angles are inconsistent. When the blade installation angle is inconsistent, the pump water volume will be reduced by 5%; During maintenance, the oil consumption or power consumption of the pump during operation can be reduced by 5%-6% by measuring with an angle ruler and installing a fixed alignment.