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).
Sub-committee report on the discussion of Bentley bearings for 3.5-litre engines.
| Identifier | ExFiles\Box 115\3\ scan0077 | |
| Date | 23th October 1937 | |
| By.{R.W. Bailey - Chief Engineer} from RM.{William Robotham - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} c. Hs.{Lord Ernest Hives - Chair} c. Ha. c. W/P - Sp.{Mr Spinney} c. W/K - Pk. 1020? Rm.{William Robotham - Chief Engineer}10/RH.{R. Hollingworth}23.10.37. BENTLEY BEARINGS. A sub-committee met after the Depot Conference on Tuesday, October 26th to discuss Bentley bearings. The memo Rm{William Robotham - Chief Engineer}1/R.7.7.37 was taken as a basis for discussion, and the recommendations contained therein were re-considered having regard to up-to-date knowledge. 3½ LITRE. It was considered that the recommendations re the 3½-litre only needed alteration with regard to section B. It was decided that this section should now read:- B. BIG END BEARING CONVERSION At 25,000 miles or when an E.20 is carried out, the opportunity should be taken of putting a groove in the lower half of all the intermediate bearings. If when this modification is carried out the big end bearings show signs of breaking up they should be replaced by new white metal ====== bearings as hitherto. It is not necessary to fit a larger oil pump to 3½-litres which are treated in this manner. During the discussion it was ascertained that in certain cases Hall's Metal bearings had been fitted to 3½-litres without the intermediates being grooved. A recommendation had previously been made that the intermediates on 3½-litres should be grooved as opportunity occurred, but this information was not incorporated in Rm{William Robotham - Chief Engineer}1/R.7.7.37. We believe there are only a few cases where Hall's Metal bearings are running about without the intermediates being grooved, and would ask Ha. to insert these grooves as soon as opportunity occurs. By.{R.W. Bailey - Chief Engineer} recommends groove at present in top half of B.M. bearings should be transferred to rod as on present production, as soon as sets of floating rods are available. | ||