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).
Requesting the fitting of exhaust valves with nitrided stems to a PH.III NO.14 unit, specifying the required clearance.
| Identifier | ExFiles\Box 92\6\ scan0219 | |
| Date | 22th September 1937 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}6/MH.{M. Huckerby}22.9.37. x 300 B PH.III NO.14 UNIT. We understand that the exhaust valves (E.88447) with nitrided stems are now completed. Will you please fit same to B side of the above unit. The diametrical clearance between the valve stem and the guides to be .0015 - .002 as in accordance with our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/AP.25.6.37. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||