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).
Low oil pressure issues and potential solutions for hydraulic tappets.
| Identifier | ExFiles\Box 91\4\ scan0215 | |
| Date | 21th August 1935 | |
| +305a (1) Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}5/KW.21.8.35. G.W. Hancock, Esq., Hotel de France, Chateauroux, Indre, France. Oil Supply to Hydraulic Tappets. We do not quite understand your memo. in which you say there is only 2 lbs. pressure in the hydraulic tappets. Is this while the main gauge is reading 20 lbs., or while it is reading only about 5 lbs. when the engine is ticking over ? The tappets are fed on the by-pass of the main pressure oil with the idea that they shall never run short. Swindall suggests you will get an improvement by cutting off the supply of oil to the dynamo pinion, as shown in the attached sketch. There is one other trouble we discovered on the first production SpectreCodename for Phantom III unit, in which the filter element for the tappets was of the circular type as opposed to the star type. This had been made with the gauze on the outside of the felt, and the oil pressure collapsed the whole element completely and prevented any flow of oil. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||