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).
Modification to the crankcase rear end oil retaining groove for the Bentley 60 and 80 models.
| Identifier | ExFiles\Box 123\5\ scan0084 | |
| Date | 12th September 1938 | |
| BP/MS. c. Rm.{William Robotham - Chief Engineer} c. HPS.{Horace Percy Smith - Experimental Factory Mgr} Re-Lee DA.{Bernard Day - Chassis Design}4/G.12.9.38. 1044 BENTLEY 60. CRANKCASE REAR END OIL RETAINING GROOVE. Please receive herewith :- E.CD.887 Modified Rear Bearing Oil Collecting Groove Bentley 60 and 80. The oil retaining groove at the rear of the crankcase rear bearing has been modified to make the parallel sides of groove square with the axis of crankshaft instead of being inclined forward. On the first design of the oil return E.CD. 436 we were compelled to incline the groove forward to obtain maximum capacity for groove in a limited space, but on a later design E.CD.772 the crankshaft flange was moved rearwards by .150 and owing to this we are now able to simplify the machining of the groove as shewn on E.CD.887. It should be noted that the crankshaft is slightly altered to suit. The alteration should be included in the crankcases for the second engine and onwards, and will also apply to the B.80 crankcase and crankshaft, the first B.60 crankcase and crankshaft will be made to the original dimensions. Will you please instruct for the alterations to be made as stated above. DA.{Bernard Day - Chassis Design} Swall | ||