AIR TESTING THE ENGINE.
One of the newer tests for piston rings involves the use of air under pressure. A special plug is inserted into each cylinder in turn and a tyre air hose attached to a suitable coupling. The amount of leakage by the rings can be determined by the amount of oil mist that rises from the oil filler pipe. It is necessary when making the test to-place the car in gear, otherwise the air will start to “run” the engine. This would upset calculations, since movement of the pistons would open valves and the air would escape The method can be used to test halves, since escape of air through intake or exhaust when the piston is at upper dead centre indicates that they do not seat properly.
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Bibliographic details
Timaru Herald, Volume CXXV, Issue 18659, 30 August 1930, Page 10
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131AIR TESTING THE ENGINE. Timaru Herald, Volume CXXV, Issue 18659, 30 August 1930, Page 10
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