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 the adjustment of the Phantom II semi-expanding carburetter.
| Identifier | ExFiles\Box 13\4\ 04-page034 | |
| Date | 21th September 1932 | |
| X7080 BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell} C. Sft.{Mr Swift} C. MX.{John H Maddocks - Chief Proving Officer} EP.{G. Eric Platford - Chief Quality Engineer} Hs{Lord Ernest Hives - Chair}/Swdl.{Len H. Swindell}12/KT. 21.9.32. ADJUSTMENT OF PHANTOM II. SEMI-EXPANDING CARBURETTER (Lec.3026). In the assembly of this carburetter and the setting of the jets, the following should be carried out. (1) Float Mechanism. (a) The floats are of (24.S.W.G. - .022) brass and the complete float assembly when ready for fitting in the float-chamber should be 3 ozs ±1 dram. (b) The pivots (E.82843) must be lineable so that the float movement is perfectly free. There should be (.004 - .008) end play between the float saddle (E.83872) and the pivots, adjusting washers (E.31312/6) being provided for this purpose. It must be seen that there is ample clearance between the floatchamber wall and the float during the movement of the latter. (c) The petrol level in the floatchamber to be set 1.050-1.100 below the floatchamber parting surface under 1 ft.3ins. head of petrol. Varying thicknesses of washers (E.31373/7) are provided for adjustment of the level. The needle valve must be perfectly free in its bush (E.82846) and the seatings of both highly polished. Creeping up of the level can be cured by lightly lapping the seats. Face of the needle bearing pad (E.82849) to have polished finish, to eliminate friction in the closing of the needle valve. (d) When the level has been set, the needle valve movement should not be less than .125 from empty to normal level. If this movement cannot be obtained check the following :- (1) Weight of the float assembly. (2) See if inside of the floatchamber has been sufficiently cleared to allow the float to rest on its base. (3) Depth of floatchamber base below the pivot centre lines is not less than drawing limits. | ||