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).
Alterations to the 20 HP crankcase and oiling system.
| Identifier | WestWitteringFiles\C\August1919\ Scan57 | |
| Date | 20th August 1919 | |
| To Div. from E.{Mr Elliott - Chief Engineer} (Div. is struck through) copy to CJ. EFC. ORIGINAL. 4 RE 20 H.P. CRANKCASE. X.3536 (struck through) X.3610 I am instructed by Mr. Royce to send you a fore-word of what we are doing with regard to the 20 H.P. crankcase and oiling system. On taking up this job again, it has been found necessary to aim for certain well defined conditions to provide maximum reliability etc. The oil pump is now to be out in the open, and connected to a strainer box (integral with the oil sump) by means of an exterior coupling pipe. By this arrangement we have the fewest number of joints of the simplest character on the suction side of the pump. The foregoing necessitates an alteration to the general shape of the lower half of the crankcase. The oil sump will now only require features for the strainer and the oil level mechanism, and it will be secured to the lower half of the crankcase by means of studs. These studs will be screwed through a flange on the lower half of the crankcase which folds inwards instead of outwards, and they will have nuts on their protruding inner ends. It has been found necessary to push out the oil pump drive shaft further from the centre of the engine for the purpose of making the skin of the crankcase of unbroken continuity, so that its ability to carry the bending stresses on the crank-case will remain unimpaired. (Contd.) | ||