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).
Resume of the position regarding issues with nuts securing exhaust manifolds and the solutions explored.
| Identifier | ExFiles\Box 66\2\ scan0281 | |
| Date | 22th June 1927 | |
| c Hs.{Lord Ernest Hives - Chair} 48230 RECEIVED [stamp] Mx{John H Maddocks - Chief Proving Officer}/McM2/T22.6.27. re Nuts Securing Exhaust Manifolds. BY3/H20.6.27. With reference to the above we give below a resume of the position. Mx{John H Maddocks - Chief Proving Officer}5/T30.11.26. Drew your attention to the trouble experienced with nuts becoming tight. BY/Mtn7/G13.12.26. advised us that special material was being obtained. BY9/H24.12.26 advised us that material was to hand and nuts would be handed to us to try out. Sft{Mr Swift}4/EMM3.1.27. covered a supply of 68 nuts to us. Mx{John H Maddocks - Chief Proving Officer}/McM6/T14.2.27 - notified By and Sft.{Mr Swift} that nuts had been fitted to chassis, and gave no signs of seizing up, but in most cases were found loose after Dyno. test. By6/H15.2.27 advised us that it would be in order to despatch chassis with bronze nuts. Mx{John H Maddocks - Chief Proving Officer}/McM/T18.2.27 informed you that all nuts had already been removed from chassis, and suggested we should use them as a test tackle fitting their own steel nuts after dynamometer. By7/H2.12.27 agreed to our proposal; The nuts were then used for a time on test when it was found that they were becoming badly distorted. The scheme of blackleading the threads of the nuts and studs was then adopted, and since then very little trouble has been experienced with the seizing up of nuts. In fact, we can say that no trouble has occurred where the doping has been properly carried out. Mx{John H Maddocks - Chief Proving Officer}/McM | ||