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).
The reliability and changes for three types of Phantom III oil coolers.
| Identifier | ExFiles\Box 131\5\ scan0061 | |
| Date | 8th April 1938 | |
| To Hd.{Mr Hayward/Mr Huddy} from Rm{William Robotham - Chief Engineer}/Std. c. Sg.{Arthur F. Sidgreaves - MD} c. HS.{Lord Ernest Hives - Chair} c. Br.{T. E. Bellringer - Repair Manager} c. By.{R.W. Bailey - Chief Engineer} c. Roy.{Sir Henry Royce} c. RHw. 1114. PH.III OIL COOLER CHANGES. As previously mentioned in various reports, there are three types of Ph.III oil coolers (1) Hand soldered type - Nos. E1 to 1386 mostly in A and B series cars. (2) Dip soldered type - any E No. oil cooler after 1386 - on C series cars up to 182nd chassis - however, there are a few hand soldered ones on C series cars. (3) Final dip soldered type with improved length and shape of tube and plate bulges - fitted from 183rd. chassis in C series onwards. The first type (1) is known to be thoroughly unreliable and accordingly a depot sheet has been issued for changing all A and B series coolers for latest F type ones. The second type (2) is better than the first, but now three failures of the second type have been experienced (out of approximately 170 coolers fitted) on C series cars while in the case of a third C series failure it is not definitely known yet which of the first two types have failed. To date no failures have been experienced with the third type while this has been shown to be very much stronger than the first two types. At the moment the depot sheet has only covered change-overs on A and B series cars as they come into depots. They are not brought in especially for this purpose. In order to determine the advisability or otherwise of altering this procedure on A and B series and also making changes | ||