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).
Proposed new design for an oil drain cock for the Peregrine 2 engine.
| Identifier | ExFiles\Box 175\6\ img018 | |
| Date | 12th November 1932 | |
| X129. To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} for. Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} re Oil Drain Cock - Peregrine 2. We have been asked by the Sales to consider using an oil drain cock to the sump which can be easily operated from above, instead of the oil drain plugs at present fitted to our crankcases. It is agreed that the latter have been improved in recent times by being placed on the side of the sump instead of underneath, but it is becoming increasingly difficult with modern coachwork, mudguarding etc. to get at any part of the chassis from underneath, and as a number of other chassis manufacturers fit oil operated oil drain cocks, it is suggested that we might consider some such scheme. A cock used for this purpose is a very old device, and has always been open to the objection that it could be casually operated and the engine left without any oil in it which caused subsequent damage in a number of cases. We have endeavoured to meet this last named objection as much as possible by combining the cock with the oil level device, and putting in a safety catch which prevents the cock being operated unless the catch is deliberately pressed down, and the catch also serves to prevent the cock coming undone due to vibration. The cock being combined with the oil level device also is convenient from a production point of view, as it demands no special features on the crankchamber, and the whole can be dealt with as a unit apart from the engine. We attach herewith a print of LeC.3246 showing the scheme as applied to Peregrine, and also a print of LeC.3273 which is a perspective drawing of the device. The cock is placed in such a position relative to the body of the oil level device that it is shielded as far as possible from flying stones, and it is also provided with an external covered plate over the oil drain hole in the manner that has been used before to prevent the hole from getting stopped up with mud. A print of LeC 3273 is also attached for Sg.{Arthur F. Sidgreaves - MD} E | ||