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).
Tests and modifications to the 'SS' engine's rocker shaft lubrication system.
| Identifier | ExFiles\Box 13\2\ 02-page020 | |
| Date | 11th November 1923 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} c. to Wor.{Arthur Wormald - General Works Manager} Hs{Lord Ernest Hives - Chair}7/LG12.11.23. X7090 'SS{S. Smith}' ROCKER SHAFT - LUBRICATION. X7090 We have made several tests with lubricating schemes for the rocker shafts on the SS.{S. Smith} engine and the scheme we are now using has proved quite satisfactory as far as our test bed experience has shewn. With the original scheme in which the oil was fed from the hollow rocker shaft on to the rocker bush the oil had to leak between the bush and shaft before reaching the push rods and valve stems. The supply by this means was inadequate. The standard Phantom has a groove cut in this bush to increase the oil supply to the push rods. We modified the SS.{S. Smith} rocker shaft by putting small flats over the oil holes on the push rod side so that oil is fed from the shaft into the annular space formed by the split pressed in bush of the rocker. By this means an adequate supply reaches the push rods which is desirable from the point of view of eliminating tappet noises and wear. It was found necessary to plug the rocker end and discharge the oil through a .062 dia. hole to prevent excessive oil flow over the valve stem. Two prints are appended (V.453/410) shewing the flats on the rocker shaft and the rocker. We suggest a similar scheme should be applied to the next SS.{S. Smith} engines which are produced. Hs.{Lord Ernest Hives - Chair} | ||