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).
Page 2 of an experimental report discussing oil leakage on servo plates and proposing solutions.
| Identifier | WestWitteringFiles\N\2October1925-December1925\ Scan237 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT -2- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/Rmd/LGL.12.25. normal touring conditions and a further 200 drops of oil was added through the lubricator. It was observed after this test that oil had crept over the crown 'S' of the servo plate and was present on the flange 'D' covering the friction plates in appreciable quantities; a certain amount having passed through the holes drilled in this plate on to the friction disc. We are aware that the system of the oil passing through the channels indicated was evolved in order to lubricate the ball race 'B', and outlet for the oil on the back servo plate is provided to prevent oil from creeping up the inside of this plate on to the friction surfaces. Although the lubrication given to the cam lever may appear altogether disproportionately intensive, we have actually seen a servo smothered in oil from this source due to a very conscientious chauffeur. We therefore suggest that either the ball race 'B' is initially packed with thick grease and further lubrication deleted or that some means is provided to make it more difficult for the oil to creep over the top of the servo plate 'S' and so on to the friction surfaces. Deleting the drain holes at 'D' would reduce the effect of the small quantity of oil on this surface. We are actually running a car in which the hole admitting oil to the servo ball race is blocked up, the servo being packed with thick grease. Hs{Lord Ernest Hives - Chair}/W.A.Robotham. | ||