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).
Failures of spare wheel carriers, exhaust valves, and oil pipes.
| Identifier | ExFiles\Box 73\3\ scan0253 | |
| Date | 22th December 1924 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. -2- Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LG22.12.24. EXPERIMENTAL REPORT. wire-netting between the driver and the windscreen because windscreens failed frequently and because of the danger of broken glass. Spare wheel carrier brackets all failed, also a number of the RR. type of step irons used under the brackets, failed. The original type of RR. wheel carrier which was fitted to one car, failed. In this case the side channels in the frame cracked at the bolt holes where the spare wheel carrier is attached. This we consider is a very serious fault because it means that both side channels on that car have got to be replaced. We should say, from our experience, that the coach-work is only 20% as reliable as the rest of the chassis. (2) The first engines were fitted with Quickstep valves. On every car in France fitted with Quickstep valves we had exhaust valve failures. Since changing to the Silchrome valves we have had no failures whatever, and several 10,000 miles have been completed. (3) A considerable number of extra oil pipes failed. They all broke in the same place, i.e., in the centre of the main pipe at the centre of the loop. The later cars were run with the front end of the main pipe not fixed solidly to the cylinder block but the front end was allowed to slide. Our Paris Depot pointed out that they had overcome oil pipe failures by this method. Extra oil pipes breaking were a frequent complaint with them. The cause is attributed to contd :- | ||