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).
Laboratory report on the examination of scored main bearings from a Bentley Chassis B.156 L.S.
| Identifier | ExFiles\Box 115\3\ scan0153 | |
| Date | 17th December 1937 | |
| To - RHC.{R. H. Coverley - Production Engineer} o.{Mr Oldham} to By.{R.W. Bailey - Chief Engineer} o.{Mr Oldham} to Rm.{William Robotham - Chief Engineer} SWDL{Len H. Swindell} Hiles Laboratory. M.1508. 1020 H1.4/RS.{Sir Henry Royce's Secretary}17.12.37. BENTLEY CHASSIS B.156 L.S. MAIN BEARINGS. The above chassis (No.78 in L. Series - Engine No. M3BB) after unit and 40 to 50 miles road test, was found to have badly scored main bearings. Examination of the working faces of the white metal thrust bearing and the six A.C.7 bearings showed that all of them had numerous particles embedded in them - See photo. No.M.1508/1 of part of A.C.7 bearing No.5. Some of these particles had travelled round the bearings, scoring the surface. Samples of oil taken from the pins and journals yielded a quantity of foreign matter, consisting chiefly of metallic particles and sand. Some of these particles are shown in the photo. M.1508/2. The third photo. M.1508/3 shows a quantity of the finer ferrous particles collected on a magnetised rod. Analysis of the foreign matter showed it to contain :- 20% Grit. 4% Bronze. 76% Steel and Iron. The steel portion was not all V.C.M. but contained at least 20% and probably 50% of other steels, thus showing that the particles in the oil are not chiefly wear, but foreign matter. ----------------- Hl. HC (Continued on next page.) | ||