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Aviation History
1918
1918 - 0648.PDF
Jim* 13, 19x8. THE 240 H.P. (8-CYLINDER) MERCEDES. Concluded from page 620.) Water Circulation. THE! water pump driven from the camshaft vertical driving-shaft differs slightly from the 160 h.p. Mercedes pump, chiefly in the drive. In the 160 h.p. pump the rotor is fixed directly to the vertical camshaft driving spindle by six serrations. In the 8-cylinder Mercedes pump the spindle of the pump rotor is hollow and is driven from the lower part of the vertical driving shaft by means of a dog clutch- There is a clearance of 2 mm. between the internal diameter of this hollow spindle and the vertical shaft. The rotor floats upon this hollow spindle, and is attached by means of six serrations, which allows a slight vertical movement between the spindle and the rotor. The latter is kept in close contact with the lower face of the upper bearing of the pump spindle by a coil spring. The diameter of both the inlet and outlet passages of the water pump is 35 mm. The water jacket capacity of one cylinder is 1,280 c.cs. On the aeroplane from which this engine was taken a small radiator was fitted in the centre of the top plane, having its intake pipe leading from the front cylinder of the engine and its outlet leading through the right hand strut of the cabane. Further details of the construction of the water pump are illustrated in the sectional arrangement of the pump (Fig. 21). Water Pump Test Report. The water pump was detached from the engine and tested separately, coupled to an electric motor. Separate delivery curves were taken against varying pressure. The results of these tests are given in the Fig. 21.—Section of water pump. Fig. 22.—Water pump and vertical shaft dismantled. 646
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