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).
Specification for the working clearance between the crankpins and bearings.
| Identifier | ExFiles\Box 115\3\ scan0080 | |
| Date | 29th October 1937 | |
| -2- Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/WH.29.10.37. (c) Working Clearance. Diametrical clearance between the crankpins and the bore of the bearings to be normal at .00225 and with extreme limits .003. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||