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).
Production inspection, adjustment, and test procedure for the Goshawk ignition distributor and contact breaker.
| Identifier | ExFiles\Box 51\5\ Scan238 | |
| Date | 12th March 1923 | |
| X4357 12.3.23. X.3604dr - PRODUCTION INSPECTION, ADJUSTMENT & TEST OF GOSHAWK IGNITION DISTRIBUTOR & CONTACT BREAKER. X.4357 X.4354. A. {Mr Adams} MAIN DISTRIBUTOR & CONTACT BREAKER TEST. Inspection shall be made that the contact points are exactly opposite, with contact surfaces parallel; that the cam runs perfectly true and that the contact breaker lever moves freely on its pivot, which pivot should be greased. Ascertain also that the condenser connecting strip is clear of the condenser case and that the insulated spring terminal is O.K. as regards tension for gripping the low tension wire. Also see that the cam itself is greased. (1) The contact breaker shall be connected up to an ammeter, a twelve volt battery, and a non-inductive resistance of zero temperature coefficient, all in series, the last named being of such a value as to permit the passage of exactly one ampere when the points are in contact. The distributor shall then be driven at a speed of about 500 r.p.m. The correct platinum point setting will then be such as to permit the passage of a current of .55 ampere during rotation. The resulting platinum gap should be noted for future reference and should lie between .018" and .022", 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. Contd. | ||