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).
Instructions for testing and adjusting a distributor, including platinum gap, spring tension, and high tension rotor.
| Identifier | ExFiles\Box 61b\2\ scan0006 | |
| Date | 28th January 1925 guessed | |
| -2- Contd. The resulting platinum gap should be noted for future reference and should lie between .017" and .021" but the adjustment should initially be carried out as above. (2) The distributor should now be speeded up to 1800 r.p.m. when the average current should not be less than .46 ampere. If it is, it is probable that the set of the contact breaker lever spring requires increasing. 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 rocket 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 .9 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 | ||