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).
The adjustment procedures for carburetter components like jet tubes, operating rods, and levers.
| Identifier | ExFiles\Box 66a\1\ scan0033 | |
| Date | 26th January 1925 | |
| R.R. 493A (50M) (D.B. 175 25-9-24) J.H.D. -3- EXPERIMENTAL REPORT. Expl. No. REF. HS{Lord Ernest Hives - Chair}/ACL/LG26.1.25. the jets are adjusted for running. Jet Tubes. These must screw home firmly on their washers E.71447, E.71456 so that their spraying ends are concentric with the bores of the throats. Operating rods and nuts. The nuts E.71738 and E.71737 should work perfectly freely on the threads of their respective rods also the nuts should be quite free to turn in their respective levers E.71729 and E.71728 when the clamping screws E.18407 are loosened, and at the same time be perfectly secure when these screws are tight. Nuts that are tight in the levers make adjustment difficult. The jet rods should have free up and down movement and there should be no tendency to stick or bind. Particular care should be taken in fitting the low speed jet bearing E.71730 and after assembling, it should be tested to see that the operation of the jet rod is quite smooth. High speed jet lever and plug. In order to get full range of movement for adjustment, the lever E.71454 should not be restricted in its upward movement by the end of the plug E.71455. To test if this lever is working correctly, it should move - before it is fitted into the carburetter - so that it just projects through the slot. When fitted in position in the carburetter, it should be possible to just move the lever free from the top of the jet valve after the jet has attained its full lift under the action of its return spring E.71735. contd :- | ||