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).
Visit to John Marston Ltd. regarding the failure, conversion, and testing of oil coolers.
| Identifier | ExFiles\Box 150\3\ scan0246 | |
| Date | 19th October 1937 | |
| To By.{R.W. Bailey - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} c. to Da.{Bernard Day - Chassis Design} c. to Mx.{John H Maddocks - Chief Proving Officer} [Handwritten]: 1280 also u14 Rm{William Robotham - Chief Engineer}/Std.8/JH.19.10.37. REPORT ON VISIT TO MESSRS. JOHN MARSTON Ltd. 12.10.37. On the above date the writer visited Messrs. John Marston Ltd. Works, in order (1) To discuss the failure of a dipped type cooler which we have had on the test bed (as a test bed cooler, i.e. subjected to considerably higher pressures than it would be in the engine. (2) To superintend the conversion of some hand soldered oil coolers dipped type, by stripping off casing, fitting new outer row of tubes and redipping. (3) To obtain further information about the three MK.VI. matrices which have been removed from customers cars and returned as defective by the Repair Dept. and our Paris Depot. Taking the above points in numerical order, the following conclusions were arrived at and agreed upon by Mr.Dunn and the writer. (1) Failure of dipped oil cooler. This was agreed, after examination of the sectioned cooler, to be due to a solder bond which was locally inadequate (it was only approx. .050" deep at the point of failure, this in turn being due to lack of metallic contact between the tube and the casing during the manufacturing dipping operation. In order to avoid this occurring either in the case of new coolers or in converting hand soldered ones, a different method of dipping the cooler was tried out at the suggestion of By.{R.W. Bailey - Chief Engineer} and the writer. The cooler was assembled with all pieces loose (including tubes) and without the bottom plate - the latter was then pressed into position, thus pressing the tubes and casing tightly together and the cooler was dipped as a whole. Such a cooler has been brought back for test. When we came to apply this method to a stripped hand soldered cooler however, it was noticed before starting that the tube bulges were not parallel. Neither were the edges of the top and bottom plates in | ||