From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test procedures for an ignition distributor and governor, covering electrical and mechanical checks.
Identifier | ExFiles\Box 61b\2\ scan0266 | |
Date | 25th September 1935 guessed | |
-2- (5) By means of a spring balance suitably attached to the contact end of the rocker arm, the tension required, just to break contact (indicated by small lamp in circuit) should be noted. This tension should lie between the limits of 1.3 and 1.5 lbs. This test is important. There should be no readable difference between just making and just breaking contact, this indicating absence of any friction at the pivot. (6) The distributor high tension rotor should be placed on a rig made to receive it, in such a way that the secondary voltage of a coil undergoing its open circuit test, shall be applied between the rotor blade and the inside of its bakelite moulding. This provided the coil satisfactory passes the test confirms that the rotor insulation is sound. (7) Ascertain that the contact lever spring is free from cracks. The contact lever, complete with spring should be temporarily removed and the lever pushed back once or twice against the spring as far as possible, without shewing any signs of distress. (8) After the governor test, the H.T. rotor shall be examined for registry with the stationary H.T. points, including comparison of the radial clearances with limits given on the drawing. The distance measured from the leading corner of the rotor to the beginning of the mark where the sparks have passed, must lie between the limits .150" to .050". (9) The tangential force at lever pin radius necessary to advance or retard the ignition distributor, shall lie between the limits 2 1/2 to 3 1/2 lbs weight. (10) Ascertain that the contact levers move freely on their pivots which should be slightly grease, also see that the cam lubricator wick is properly adjusted and oiled. B. Mechanical test of SpectreCodename for Phantom III Governor. (1) The distributor shall now be fitted up with its rotor and cover, then wired up to a standard ignition equipment. A disc marked in degrees is fitted to the driving end of the shaft, a spark gap and pointer arranged to shew the instantaneous position of disc at every revolution. By the light, of any one of the twelve sparks from the distributor, intensified by the use of a H.T. condenser in parallel with the spark gap. The remaining eleven sparks are allowed to discharge at any convenient gap. | ||