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 petrol pumps to check for air and fuel leaks.
| Identifier | ExFiles\Box 27a\2\ Scan267 | |
| Date | 17th October 1933 | |
| -3- Hs{Lord Ernest Hives - Chair}/BwR.8/KT.17.10.33. output, this is due to the variation of diaphragms in manufacture over which at present we have no control. (C) All joints, washers, etc. must be inspected for petrol leaks whilst the pump is delivering. When the delivery has been checked and passed, keep the pump operating and check for air leaks, this is done by either fitting blank plugs to the carb. feed pipes, or by placing one's fingers tightly over the end of the pipes and so stopping the flow. Having done this the pumps should immediately cease to operate, and by so doing show that they are free from air leaks and that the valves are seating properly. In the event of the pumps continuing to operate there are three alternatives by which to check the leak. (1) Make sure that all unions are tight. (2) Remove delivery and suction valves and make sure that no foreign matter has become lodged under the valves. (3) Air may be leaking through the joint between the casting-diaphragm and pump flange in which case check the 2.BA nuts which hold the pump in position to the casting for tightness. It is most essential that all pumps are free from air leaks, as we find that leaks cause the pumps to continue pumping air after the petrol has reached the correct level in the float chamber, and the noise created is thrown up and magnified by the dashboard into the body, causing a very irritating "clocking" sound. (D) The pumps should be reasonably quiet in operation. ------------------ Once production commences, will you please advise us weekly of the pump numbers and their respective deliveries. Hs{Lord Ernest Hives - Chair}/J.C.Bowering. | ||