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Tracing Troubles Scientifically
Page 114
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New Ford Tester that Can Detect Almost Any Fault that Can Affect Engine Performance
THE well-known Ford ideal of providing dealer service on a level of efficiency comparable with that applying in the factory itself, has been brought a step nearer realizaticin by the introduction of a portable laboratory test set that is capable of showing up practically every fault that can affect engine performance.
The new set somewhat resembles an oversize dinner wagon, carrying on the top a panel provided with various dials, switches and so on. Sets of wander leads are provided, and the apparatus contains such items as tools, . an hydrometer, distilled water and data sheets.
The various instruments incorporated are capable of revealing the exact functioning of all items in the ignition system, the battery (including connections); starter, dynamo, lighting system, fuel pump, valves, etc.
The apparatus was demonstrated to us last week by Dagenham Motors, Ltd., 8, Balderton Street, W.1, the London Ford dealer.
If a Ford user complains of heavy petrol consumption, a vacuum gauge is connected to the intake manifold at the windscreen-wiper connection and the engine is run at idling speed. The idling jets are then readjusted until the highest vacuum reading is obtained, as this gives the best condition for efficiency and economy.
The main jet is next checked, with the throttle opened to give an engine speed equivalent to about 25 m.p.h. Too weak or too rich a mixture gives a low vacuum-meter reading. The precise cause can be determined by enriching or weakening the idling-jet mixture ; the necessary correction can then be effected and the idling jet reset.
Alternatively, the trouble might be due to the fuel pump generating too great a pressure. This point can be checked by disconnecting the pipe from the output side of the pump, connecting up the tube to the vacuum gauge (which also registers pressure) and then noting the actual pressure generated when the engine is momentarily raced.
The vacuum gauge, incidentally, can also be used for checking the speed at which the automatic ignition advance and retard mechanism comes into action.
On the electrical side, the exact performance of components can be read from meters, and it is possible even to check up the electric starter for high consumption. No dealer can obtain a test set until one of his mechanics has been through a special course at the Ford works and has passed an examination on the use of the Ford tester.