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).
Depot sheet detailing the cause and remedy for restricted water circulation in radiators due to clay-like deposits.
| Identifier | ExFiles\Box 27a\3\ Scan046 | |
| Date | 13th August 1928 | |
| To Fha. from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Depot sheet. RESTRICTED WATER CIRCULATION. ----------- Examination of radiators from recent series cars that have suffered from over-heating indicates that the obstruction is almost entirely confined to the top row of tubes. The remainder of the radiator is perfectly clean and there are, in the majority of cases, no signs of tube corrosion. The deposit when dry looks exactly like clay. One of the difficulties of the present epidemic has been that the normal caustic soda treatment will not remove this deposit, and depots being unaware of the nature of the obstruction have been obliged to return the radiators to the works. Actually we find that the deposit can be blown out by inserting a suitably shaped nozzle through the radiator cap close up to the tubes and using compressed air. [handwritten insertion: air bottle might be used] If this is done with the radiator dry and inverted, the obstruction is blown out in the form of fine dust, the matrix can then be flushed with water still in the inverted position and should then be in a 100% condition. Where compressed air is not available, a suitably shaped wire brush is a useful substitute. It should be possible to inspect the gap between the tubes in the top row with a lamp and see the effectiveness of the operation as the deposit in a choked radiator is clearly visible. Inspection of Silver Ghost radiators indicates | ||