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).
Modifications to a crankshaft spring drive, including assembly instructions and associated changes to damper springs and a cooling fan.
| Identifier | ExFiles\Box 79\3\ scan0153 | |
| Date | 2nd June 1923 guessed | |
| -2- not effectively interfere with the interchangeability of the crankshaft. This spring drive has to be removed in two pieces if it be desired to detach it from the engine when the latter is in position on the chassis. Removal in this way however can be easily accomplished by undoing the coupling bolts of the outer drive unit. To facilitate reassembly when the engine is on the chassis tapped holes have been provided in the pressure friction plate and the crankshaft lock washer has been secured with set screws. This enables the assembler to secure the pressure plate with its springs in the spring drive drum by means of 5.BA screws inserted through the crankshaft lock washer set bolt holes. The damper springs have been made smaller in diameter to accommodate the alterations required on the spring drive and particulars of these springs are given on the drawing. Particulars are shewn of a special spanner which is required to deal with the nut which secures the friction plate and spring driver on the crankshaft pinion. This spanner is intended to be used with spanner tube U.718., but as previously pointed out in this memo. the tightening of the nut has to be either assisted by other means or the friction plate pressed on independently to the necessary tightness. You will notice that LeC.1727 is dependent on the fact that we are standardising the cooling fan driven from the dynamo drive spindle of the wheelcase, so that it would be highly desirable if these two alterations could be carried out simultaneously. E.{Mr Elliott - Chief Engineer} | ||