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).
Confirming tappet clearances are taken when the engine is hot for the cast iron unit.
| Identifier | ExFiles\Box 108\3\ scan0086 | |
| Date | 21th March 1939 | |
| COPY FOR FILES. To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} 600e: 21.3.39. 29.G.VI. CAST IRON UNIT. Replying to Rm.{William Robotham - Chief Engineer}1/R.18.3.39, we appreciate the varying tappet clearances during the warming up period, and all our figures given for tappet clearances are taken when the engine is hot, i.e. actually at road running temperature. After obtaining idling and slow running results tappets are always again checked hot. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||