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).
Instructions for rectifying low oil pressure and details of bearings for a B.III - 3.B.IV chassis.
| Identifier | ExFiles\Box 82\5\ scan0019 | |
| Date | 3rd March 1937 | |
| 200a. GWH{George W. Hancock - Head Chateauroux}/IMW.{Ivan M. Waller - Head of Chateauroux} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/R.3.3.37. B.III - 3.B.IV CHASSIS. We are informed by Rm{William Robotham - Chief Engineer}/Steadman that the oil pressure is down to 20 lbs square inch when running at high speeds with the oil hot on the above car. If this is so, will you please raise it under these conditions to give 25 to 30 lbs per square inch by stretching the relief valve spring slightly. The silting up of the external filter will tend to reduce the main pressure, and we would like you to insert the new element (Tecalemit) which we are sending out, to see if the pressure goes up when the new element is fitted. The main bearings in this unit are AC.2 and the big ends are standard Halls metal, A.C.7, the number indicating the percentage of tin in the alloy. Both the journals and crankpins have an extra hole drilled, making 2 in each. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||