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).
Overtightening issues with aluminium carburetter float-chamber covers and potential design changes.
| Identifier | ExFiles\Box 66a\1\ scan0229 | |
| Date | 21th June 1927 | |
| JLS. Lillie Hall. c. GWB. c. Hs.{Lord Ernest Hives - Chair} X8081 EP{G. Eric Platford - Chief Quality Engineer}8/H21.6.27. re. Aluminium Carburetters. --------------------- With reference to your L36/H18.6.27, we have ourselves experienced the trouble referred to by you on test since aluminium carburetters were first started, and the point has been taken up by the D.O. and Experimental Dept. for attention. MX.{John H Maddocks - Chief Proving Officer} spent some time on this job and as a matter of fact the following is an instruction issued by him to the Test Department, which we have also issued to our final testers, and which we feel you should be aware of, so that you can act similarly:- "The aluminium carburetter floatchamber cover requires careful use during test. When refitting the cover the threads should be carefully cleaned and lubricated with oil or grease. The lid{A. J. Lidsey} should only be tightened up hand tight, although a hexagon is provided it should not be used for tightening purposes, as there is a danger of overtightening, and consequently great difficulty in removing the lid{A. J. Lidsey} at a later period. Probably the hexagon will be replaced by a knurled diameter at a later date in order to minimize the danger of overtightening." We do not, however, feel at this stage that this is a memo which we can circulate to Depots. We are pushing for the hexagon to be replaced by a knurled diameter as suggested in the last paragraph of this Instruction Sheet. EP.{G. Eric Platford - Chief Quality Engineer} P.S. We now learn that no further action is being taken as it is now considered that the fixing of the locking device to the float feed chamber [typed, struck through: obviates] [handwritten: avoids] the necessity of the cover being tightened up. [handwritten: which has been avoided for some time.] | ||