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).
Phantom III oil cooler failures and proposing a change to a more reliable type.
Identifier | ExFiles\Box 131\5\ scan0070 | |
Date | 10th March 1938 | |
To Hs.{Lord Ernest Hives - Chair} c. to By.{R.W. Bailey - Chief Engineer} c. to Hd.{Mr Hayward/Mr Huddy} c. to Roy.{Sir Henry Royce} c. to RHC.{R. H. Coverley - Production Engineer} 1114 PHANTOM III OIL COOLER FAILURES. In connection with these failures and the proposal to change C series oil coolers for F type (latest type) coolers, we have collected all the data available, in the form of what records etc. the Repair Dept. possess, concerning the number of failures and period of time in service etc. Owing to lack of information it is not possible to compile this data on a mileage basis but instead a time in service basis has been used. Attached sheet shows this data summarised - it will be seen that with the dip-soldered or second type cooler we have less than a third, and with the final F type cooler less than one sixth of the total experience in service with the original hand soldered cooler. For the purpose of obtaining this data in complete form, we have had to assume that all A & B series cars were originally fitted with hand soldered coolers and that all C series cars were originally fitted with dip soldered cooler - actually a few hand soldered coolers were in C series and vice versa. From the experience available the dip soldered (2nd. type) cooler has proved approximately 75% more reliable than the hand soldered original type while with the final 'F' type no failures have yet been experienced. We agree that it is expedient from a safety point of view, to commence changing C series oil coolers for F type coolers forthwith. We think however that the Repair Dept. should be particularly watchful for any F type cooler failure and in the event of that happening the oil cooler change-overs on C series should be stopped immediately in order to avoid useless expenditure. | ||