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).
Page detailing specifications for float, filter, and jet valve components.
| Identifier | ExFiles\Box 66a\1\ scan0032 | |
| Date | 25th September 1924 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF HM{Capt. W. Hallam - Head Repairs}/ACS/1.928.1.25. the valve seating, and the distance from the top of the float chamber must come within the above limits. Float. Drawing E.71864. The weight and size should be checked. The weight should be between 2.8 ozs. and 3.2 ozs. for use with ordinary petrol. Filter. Drawing E.70400. This should fit correctly and easily. The washer should be a tight fit in the float chamber unit so that when filter is withdrawn for cleaning purposes, the washer remains in position. Similarly with the washer under the securing nut. The end E.70379 is riveted over with the frame E.70398 in position and care should be taken that the end of this frame is concentric with the washer flange. It is essential that the upper end of the filter frame fits correctly in the bore at the top of the filter chamber. Leakage at this point would annul the action of the filter. Jets - high and low speed and jet valves. The jet needles E.71732 (high speed) and E.71744 (low speed) should work freely in their respective jet tubes. E.71827 (high speed) and E.71525 (low speed). The high speed jet needle is arranged to pass right into the jet tube so that in the event of mis-adjustment, the operating parts will not be strained if forced into the full weak position, as would be the case if it were allowed to completely stop in the tube like the low speed needle. It is important that the conical faces of both needles are concentric with the bores of their respective jet tubes so that an annular space is formed when Contd | ||