United States. Army. Signal Corps · Washington · leaf 64
carries the pumps which return this oil to the main oil pump. It is constructed of very thin material and engines must never be allowed to rest with their weight on the crank case. The cam shaft. — The cam shaft carries the cams which operate the valves and as the latter are machined and solid with… … Fig. 23. Gears. — Since the cam shaft runs at half the speed of the crank shaft it is necessary to gear them together. In case one of these wheels has to be replaced it should be remembered that the type of teeth in each wheel must be the same. If the teeth ‘‘bottom” there will be a tremendous…
Aeronautics, Military
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