Operation of Harley-Davidson Automatic Mechanical Oil Pump

The Harley-Davidson oil pump has no check valves to stick, no ball valves to "float," no valve springs to break and no small parts to go wrong.

In illustration No. 12 the rotary valve member R rotates in a left hand direction, looking at it from the top.

After the cam H has raised the plunger P to its highest point, the spring Y returns the plunger, drawing a charge of oil from the tank through the supply pipe S, and through the intake system as follows:

Through the channel L, oil reaches the intake port I, in the valve chamber. The port I is connected with the hollow center C of distributor R. From C the oil passes through the opening A into the distributor channel X, then through channel B to pump chamber T. (continued on page 61)

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CLICK IMAGE TO ENLARGE Hello Grandma, I am having a fine time out here racing I have not been hurt very bad yet, This picture shown is when I made a world's record 10 miles in 8 minutes and 5 seconds or 75 miles an hour on a 1/4 mile track. I am on the upper machine. Love to all. Norman

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