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 modifications to bearings and their lubrication on Bentley cars.
Identifier | ExFiles\Box 115\3\ scan0043 | |
Date | 31th March 1937 | |
To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} c. Hs.{Lord Ernest Hives - Chair} x 1020 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}12/WH.31.3.37. History of Modifications to Bearings and their Lubrication on Bentley. (1) 3 1/2 Litre Bentley. A to F series. 25.6.33 to 30.1.36. Connecting rod and main bearings in W/M.{Mr Moon / Mr Moore} No grooves in intermediate main bearings. Single .2187 dia. hole in each crankshaft journal and crankpin. (2) 4 1/4 Litre Bentley. G to 81st. H series. 30.1.36 to 22.8.36. (a) Connecting rod and main bearings in Halls solid AC7 material. Partial grooves on the intermediate main bearings. Single .2187 dia. hole in each crankshaft journal and crankpin. (b) 82nd. H series to 192 on J series. 22.8.36 to 20.2.37. Partial grooves made continuous on intermediate main bearings. (c) From 193rd. in J series. 20.2.37. Sectional dimensions of the intermediate main bearing grooves increased from .025 x .100 to .050 x .125. (d) From 1st. in K series. 25.3.37. Increased capacity helical gear oil pump fitted. (e) From 33rd. in K series. 17.4.37. An extra and opposite hole drilled in each crankshaft journal making 2 - .2187 dia. in each. (f) From 176th. in K series. 7.8.37. Existing single .2187 dia. hole in each crankpin deleted and 2 holes .125 dia. introduced. Connecting rod bearing bush having 1 centre hole, for feeding up the rod in place of original 2 holes. In conjunction groove in connecting rod deleted. | ||