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).
Design of tappets and the decision to revert to keying them.
| Identifier | ExFiles\Box 158\4\ scan0003 | |
| Date | 30th November 1919 | |
| R.R. 235A (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13. X3733 To BN.{W.O. Bentley / Mr Barrington} from R.{Sir Henry Royce} Copy to CJ. " " HS.{Lord Ernest Hives - Chair} " " EP.{G. Eric Platford - Chief Quality Engineer} " " WOR.{Arthur Wormald - General Works Manager} " " DA.{Bernard Day - Chassis Design} X.3733. RE TAPPETS. R4/G30.11.19. For simplicity and to avoid a slight risk of weakness, we discontinued keying the tappets. It has always been found that to keep the valves really quiet it is necessary to have very fine adjustments in the clearance, and that EP.{G. Eric Platford - Chief Quality Engineer} and HS.{Lord Ernest Hives - Chair} demonstrates that the tappets turn round and alter the clearance, hence our desire to go back to keying. E . has sent drawing of the way this must be done with present designs making no alterations to tappets. This will be carried out rather differently (which will avoid the slight previous weakness) for next 10,000 miles and 2 EX. R.{Sir Henry Royce} | ||