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 dismantling and cleaning the downdraught Zenith carburetter type VI.
Identifier | ExFiles\Box 122\1\ scan0113 | |
Date | 27th May 1931 guessed | |
THE ZENITH CARBURETTER CO., LIMITED. Sheet No. 1. INSTRUCTIONS FOR DISMANTLING AND CLEANING THE DOWNDRAUGHT ZENITH CARBURETTER TYPE VI. The only attention required by the carburetters is to keep them clean and free from all dirt or sediment. In order to help the customers in that respect, the petrol is admitted to the float-chamber through a filter in the float-chamber cover. To remove this filter and clean it, unscrew the hexagonal union plug, when it will be found that the whole filter comes out. If any dirt should be seen inside the gauze, this should be removed from its support, which is provided at its extremity, with a screw-driver slot. Unscrew the support from the hexagonal plug and it will then be found that the gauze slides along the central support and can be easily washed in petrol, as can also the support itself. If any sediment seems to have collected at the bottom of the float-chamber, remove this by undoing the two square-headed screws seen on each side of the float-chamber cover. The whole float-chamber will then come apart from the throttle bore. Care should be taken however, to pull the float-chamber away from the throttle bore and slightly downwards, and not to try and swing it round sideways until it is well clear from the throttle bore. The position of the jets is shown on the attached drawing; they are covered by plugs with female squares in the centre. They can be removed by inserting in the square the small end of the square-headed screws mentioned above, or by using the ordinary jet supplied with the triple diffuser Zenith Carburetters. Once the plugs are removed, the jets can in turn be unscrewed by using the same tools again, as they are provided with the same female squares as the plugs. If the jets are partly choked up, clean them by blowing through, but never use anything like a pin or a wire. Generally the setting fitted in the carburetter will not require altering. If however, it should be found unsatisfactory, new jets can be fitted, but the original one should not be opened out or tampered with in any way. It will seldom be found necessary to alter the size of the choke tube. It may however, be advisable to do so in order, for example, to suit extreme climatic conditions. To remove it, first unscrew the two little screws seen on top of the air cowl at each end of its longer axis and then the air cowl can be removed. Then proceed by unscrewing the two studs holding the strangler body on top of the throttle bore. These studs are | ||