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).
Page detailing testing procedures for contact spring tension and distributor high tension rotor insulation.
| Identifier | ExFiles\Box 51\5\ Scan239 | |
| Date | 12th March 1923 guessed | |
| -2- Contd. That screw of the two securing the contact spring clamp nearer to the contact points shall now be removed. Through the hole thus available, a wire, having a hook at each end is inserted and attached to the contact end of the rocker arm. A spring balance is now hooked on to the other end of the wire and the tension required just to break contact (and indicated by the ammeter in circuit) is noted, care being taken that the wire is clear of the side of the hole. This tension should lie between the limits .8 and 1.2 lbs. There should be no readable difference between just making and just breaking contact, this indicating absence of friction at the pivot. After this test the spring clamp securing screw is restored. (3) 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 satisfactorily passes the test, confirms that the rotor insulation is sound. (4) After the governor test (see next page) the H.T. rotor shall be examined for registry with the stationary H.T. points. The mark where the sparks have passed must be within .175" of the leading edge of the rotor. Contd. | ||