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 and test specification for a Watford Type EG6 (d) Magneto for an R.R. Eagle Chassis.
| Identifier | ExFiles\Box 70\4\ scan0131 | |
| Date | 11th June 1925 | |
| 11.6.25. VERSION 1A. X.8781m. WATFORD TYPE EG6 (d) MAGNETO FOR R.R. EAG. CHASSIS. X.4181d. SPECIFICATION OF PRODUCTION INSPECTION & TEST. (1) The contact breaker cover, distributor ring and rear end plate shall be removed and the following details inspected :- (a) The contact breaker lever for absence of frictional effect and for suitable spring tension. (b) i. Satisfactory sliding fit of the movable cam ring. It is important that the ring be not slack at all radially, as this tends to accentuate the noise described as the "flopping" of the sleeves. (b) ii. Satisfactory fit radially of the sleeve securing ring in its housing at the bearing end. The absolute limit of radial clearance should be .0015" in order that "flopping" of the sleeve cannot occur at this location. (c) The brush on the contact breaker cover for suitable pressure on the head of the contact breaker bolt. (d) The maximum primary gaps, which should be .011" and which therefore should not differ on the two sides by more than .002". (e) The H.T. brushes for suitable spring pressure and the H.T. slip ring brush holder for any signs of having fouled the insulating flanges. It should also be ascertained that there is no tendency for the carbon brushes to stick in their holders, when pushed right home. (f) The safety spark gap for satisfactory distance - this should be 8.2 to 8.5 mm. (g) The distributor brush and spring mechanism, also the track on the distributor ring. As in the case of the H.T. brushes, there should be no tendency for this brush to stick in its holder. (h) The armature spindle for any end play in the bearings. (2) The available range of the advance lever should be ascertained and should not be less than 58º. (Contd.) | ||