Surface and water pressure
pump volute chamber (also called rough surface corrosion inside). Surface corrosion bump can make water pumps reduces 7-8%, Only when the maintenance with steel brush and iron ore paper or wheel grinding smooth, can make its work when the fuel consumption and reduce 9% - 14%.
Sealing ring clearance. According to the samples, when in impeller radius increased 4 millimeter between direction, pump water will be reduced by 10%, Only when the maintenance with organic adhesive and asbestos line to restore the gap, can make provisions in the oil pump power or 10% - 12%.

Water pressure chamber and the axis of the impeller does not coincide. According to the test, when the water pressure chamber and the axis of the impeller from 2 mm or greater than 2 degrees, landform pump water will reduce 5-6%; When measuring, attentive, need careful find a position of the centre axis loading, can make the oil pump in work or consumption reducing 6-7%.
Leaf installation Angle. When the blade installation Angle, pump water will reduce about 5%. Repair, use, installation Angle is feet, can make solid alignment of oil pump in work or consumption can be reduced by 5% - 6%.