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).
Testing procedures for carburettor components including the jet operating lever and petrol float chamber.
| Identifier | ExFiles\Box 66a\1\ scan0034 | |
| Date | 26th January 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -4- Expl. No. REF: HS{Lord Ernest Hives - Chair}/ACL/LG26.1.25. This jet operating lever should work square in the centre of the head of the jet valve and its operating can be tested before connecting the valve rod E.71733 by lifting the end of the lever with the finger so that the jet valve is depressed to its full extent into the stand pipe. Return spring for high speed jet valve. This unit is built up with the following parts :- E.71731 H.S.plug, E.71735 spring, E.71734 spring cap, and E.71463 Retaining ring. When these parts are assembled, the complete unit should be tested to see that the return spring and its cap are working correctly. When cap is pressed down its maximum distance by means of the jet valve, it should return it without any tendency to stick in the down position. Petrol level in float chamber. When the carburetter is assembled, the petrol level should be checked. It can be conveniently done in the following way :- See that the carburetter is perfectly level and connect up with a petrol tank so that the head - that is the height of the top of the petrol from the float chamber - is the same as when on the car. This is 15" measured from the top of the float chamber face. Disconnect the union for the starter carburetter and with this connect a piece of glass tube by means of a rubber pipe. The glass tube - which should not have less than ¼" internal diameter - can be placed vertically alongside the float chamber and used as a gauge to show the level of the contd :- | ||