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).
Safe operational life and replacement schedule for whitemetal main bearings based on mileage.
| Identifier | ExFiles\Box 146\3\ scan0270 | |
| Date | 23th December 1936 | |
| To "Hd{Mr Hayward/Mr Huddy}" "Rm{William Robotham - Chief Engineer}" Sr/VAI/MLG.23.12.36 -4- There is another important point and that is the safe life of whitemetal main bearings, we are unable to say whether if they were found to be in a good condition at the first R.20 (32.000 to 35.000 kms) and were tigghtened up whether they would with safety, last until the 2nd R.20 , ( 64.000 to 70.000 kms. ) From the experience which we have so far gained we should say that the original W/M bearings need changing somewhere in the region between the 2 R.20's, viz- at about 40.000 to 45.000 kms. On some cars we have changed the bearings between 30.000 to 35.000 kms. | ||