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).
Possible explanation for broken valve springs related to insufficient counterbore diameter.
| Identifier | ExFiles\Box 82\2\ scan0147 | |
| Date | 3rd August 1934 | |
| G.W. Hancock, Esq., Hotel de France, Chateauroux, Indre, France. 4553a Hs{Lord Ernest Hives - Chair}/Smth.15/KW.3.8.34. Broken Valve Springs. A possible explanation of the spring breakages is that the counterbore X is not of sufficient diameter to allow the spring ends to rest freely on the flat surface. Will you check this point ? Hs{Lord Ernest Hives - Chair}/F.Ll.Smith. | ||