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).
Modifications for the 3 1/2 Litre Bentley clutch pit ventilation system.
| Identifier | ExFiles\Box 85\2\ scan0024 | |
| Date | 13th July 1933 | |
| X 212 To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} c. to E.{Mr Elliott - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}8/KT.13.7.33. 3 1/2 LITRE BENTLEY CLUTCH PIT VENTILATION. In order to prevent engine oil from leaking into the clutch pit via the rear bearing it is necessary to produce a greater pressure in the clutch pit than exists in the engine crankcase. This can be done by the following means, and it is important that all production Bentley cars are so fitted. (1) Delete the large ventilation hole from over the starter motor housing. (2) The drain hole under the starter motor should be .250" diameter. (3) Clutch pit inspection cover to Ex.10302; sample handed to 'By' herewith. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} | ||