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 diagnosing and adjusting the ignition advance mechanism and linkage.
| Identifier | ExFiles\Box 65\1\ scan0069 | |
| Date | 28th January 1925 guessed | |
| contd :- -3- 47° ± 2° B.T.C. If this does not occur, Rod E.72614 should be disconnected and the test repeated; if this enables the required range to be obtained, the obstruction was due to the magneto sleeve coming up against its stop and to obviate this, Rod E.72614 should be lengthened slightly. Should the range still be deficient, however, Rod E.72586 to the distributor should be disconnected, if this produces the required improvement the distributor is coming up against its stop. In this case the Rod E.72586 should be shortened and the battery ignition re-timed. If neither the magneto or battery are responsible for restricting the movement, the levers in the linkage should be examined to see that their jaws allow them to work through the required angle and that no toggling is taking place. If the linkage appears to be satisfactory, the cap on the top of the oil relay E.72495 should be unscrewed a turn. If this increases the advance obtainable, the cap should be adjusted until the required 47° can be obtained and then a washer of suitable thickness fitted beneath it. If more than 49° advance on the flywheel can be obtained, the movement of the linkage should be reduced by lowering cap E.72495 and reducing the thickness of its packing washer. It is very important that the limit of the movement of the automatic advance should be dictated by the position of Cap E.72495 and not the movement of the controls. Unless this is so, the controls will undoubtedly be strained owing to the very powerful force which can be exerted by the contd:- | ||