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).
History of bearing tests on Bentley 3 1/2 Litre and Phantom III vehicles.
| Identifier | ExFiles\Box 83\3\ scan0067 | |
| Date | 16th November 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux} 16th. November 1937. 200. HISTORY OF BEARINGS ON/10,000 MILES TESTS OF BENTLEY AND PHANTOM III. Herewith particulars called for in your Rm.{William Robotham - Chief Engineer}1/R.10.11.37. BENTLEY 3 1/2 LITRE. 1.B.IV Feb.1933. Big ends starting to show cracks at 12,196. No trouble with main bearings reported. 1.B.IV July 1933. Running stopped after 7000 miles by balance weight leaving crankshaft. W/MT Main bearings cracking up, pitted and scored. W/MT Big ends breaking up. 1.B.IV Oct. 1933. No bearing trouble reported in 10,500 miles. 1.B.IV Nov. 1933. Big ends beginning to crack up at 10,000. No further trouble with bearings reported after 13,000. 4.B.IV Jan. 1934. (In England). No bearing trouble in 10,000 miles. | ||