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).
Investigation report on the failures of Phantom III steering rollers, listing specific chassis, mileages, and conclusions for each case.
| Identifier | ExFiles\Box 148\5\ scan0244 | |
| Date | 11th December 1937 | |
| By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. Hs.{Lord Ernest Hives - Chair} c. RHC.{R. H. Coverley - Production Engineer} Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer}6/R.11.12.37. FAILURES OF P.III STEERING ROLLERS. We have been investigating the failures of the roller bearings in P.III steering roller followers, and have now reached some conclusions. We give below a list of the failures which have occurred to date with a summary of the evidence, and our conclusions in each case. Chassis, Owner & Mileage. Remarks. (1) 32-EX on French test, 12,500 miles. Some rollers crushed - others O.K. Inner and outer races in good condition. Depth of case-hardening on inner races 0.040. Failure attributed to accident in which front hub cap was hit by hub cap of car proceeding in opposite direction. Wheels were found to be toed out ¼" after accident. (2) 3.BU.96, A.{Mr Adams} Hartley. 10,000 miles. Some rollers crushed, others chipped at ends. Inner races badly worn. Parts now lost so cannot check depth of case-hardening, but owing to worn condition of inner races and chipped ends of rollers assume case-hardening was too thin. (3) 3.BU.94. M.{Mr Moon / Mr Moore} de Villeroy. 5,828 miles. Some rollers crushed others chipped at ends. Both inner races badly worn. Depth of case-hardening 0.025. Failure attributed to insufficient case-hardening. (4) 3.AX.175. 11,370 miles. No rollers crushed but all in one cage chipped at ends. Corresponding inner race very badly worn. Depth of case-hardening 0.020. Failure due to insufficient case-hardening. | ||