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).
Peculiar noise caused by the spring-loaded filler cap on radiators.
| Identifier | ExFiles\Box 16\2\ Scan070 | |
| Date | 17th October 1932 | |
| X7250. BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/GMH. C. E.{Mr Elliott - Chief Engineer} Hd.{Mr Hayward/Mr Huddy} HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}4/KT.17.10.32. RADIATORS. X5250. Spring Loaded Filler Cap. We have for some time been tracing a peculiar noise when the engine was started up after standing for a short time. It appeared to come from the gearbox and could be mistaken for a dry ball race. The noise, however, comes from the radiator and is caused by air entering by the valve in the filler cap, a slight depression having formed in the top tank of the radiator by cooling effect. This does not occur if the release valve is free as it then automatically opens with very slight depressions and no audible noise is produced. One of the chief faults which causes the stickiness of the valve is the spring E.81351. We find that the outer diameter is too large and binds in the cage. New springs obtained from the stores are oversize in this respect. It would be an advantage to have the springs .020" less in diameter, to lessen the tendency of binding. In service the valve is inclined to get corroded which affects its clearance, and the above noise may be a complaint. The remedy is a few minutes job. Hs{Lord Ernest Hives - Chair}/GMH. | ||