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Technical Page 58:

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Motor Lubrication, Mechanical Oil Pump, Motor Care and Repair

What Perfect Motor Lubrication Means

The Harley-Davidson oil pump is designed to feed just the right amount of oil to the motor. With oil in the tank, a scarcity of oil in the motor is impossible. Neither can the pump feed an oversupply when properly adjusted. This makes for great economy.

More advantageous than this economy of oil is the fact that perfect lubrication eliminates excessive carbonizing of the motor and all the attendant evils. Strange as it may seem at first thought, too much oil, while not so serious as an undersupply, will eventually wear out any motor. Harley-Davidson engineers found that the only way to prevent an oversupply was to lubricate the motor by an automatic mechanical driven pump, with a large, positively operated, rotary valve working independently of temperature conditions.

On the subject of overoiling we want to call attention to the fact that it is not necessary to have blue smoke at the exhaust to indicate that the motor is receiving sufficient oil. There may be an oversupply of oil in the crank case and the motor not smoke. Too much oil in the crank case will cause loss of power and speed due to the overheating of the oil. Read carefully the instructions on the adjustment of the mechanical oiler and the use of the hand pump.

Serious Results of Excessive Lubrication

When a motor becomes carbonized, tiny particles of carbon gradually work into the cylinder walls, piston face and piston rings, acting as an abrasive, eventually causing wear to these parts.

Some of this carbon works past the pistons into the crank case, where the circulation of oil carries this destructive mixture to other moving (continued on page 59)

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