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).
Bulletin about steering roller follower bearing failures on Phantom III and 25/30.HP models.
Identifier | ExFiles\Box 106\3\ scan0459 | |
Date | 10th March 1938 | |
To Hd.{Mr Hayward/Mr Huddy} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} (For Depot Sheet) +300 550. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}7/AP.10.3.38 P.III. and 25/30.HP. STEERING. A number of cases of crushing or chipping of the rollers and balls in the bearings of steering roller followers have occurred. The majority of these failures are due to collapsing of the bearing tracks on the inner cones as a result of insufficient depth of casehardening. Cones with increased depth of case are now available on Production. Cases have also occurred where the roller follower is excessively slack on its bearings but the balls and rollers are intact. This slackness is also due to inadequate case-hardening and is a sign of impending failure. We recommend that on Ph.III. whenever a roller follower is dismantled for excessive slackness or failure of rollers new inner cones with increased depth of case and new cages should be fitted. On 25/30.HP. the roller follower is now supplied to us as a complete assembly by Ransome & Marles or Hoffmanns and the various parts are not interchangeable. Therefore, where the balls have failed or there is excessive slackness a complete new assembly should be fitted. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||