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).
And a diagram discussing gasket design, materials, and oil leak prevention.
| Identifier | ExFiles\Box 173\4\ img100 | |
| Date | 20th November 1935 guessed | |
| They are made by Federal Mogul in Detroit & I wrote to them for their booklet. (2) As regards chassis they have found (a) There is a critical speed which is necessary to prevent oil leak; varying for different chassis. A much increased running at or above the critical amount may cause the leak although a large increase below that has done no good. (b) If a light flywheel is necessary for slow running & plenty of 'back' in the pump shaft this more helps. (c) Jamming - accurately the pump shaft by tape packing or internal cork inserts helps. (3) They have used an all packed washer by a process which gives one a very much more dense packing where high unit pressure made this necessary. [Diagram text] .023" Copper .015" thick and .015" brazed on top 24 sheets AL .010 thick Two thicknesses on a cylinder and stud and one only (.130" about). I have a sample gasket. | ||