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).
Component failures and proposed remedies for a chassis.
| Identifier | ExFiles\Box 119\1\ scan0117 | |
| Date | 14th June 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/FWK.9/JH.14.6.38. (4) The N.S. damper broke its rebound piston after 17 1/2 hrs. due to the collapse of the rebound buffer, thereby allowing the damper piston to bottom on its casing. On future chassis metal pads are being fitted to provide a stop that will come into action before the damper piston bottoms. This will only be effective in the event of a buffer failure. In addition the dampers are being modified to give slightly more piston travel. (5) The O.S. damper seized up its mainshaft in the casing after 20 mins. running. This was due to the shaft being soft and running in a cast iron bush. For the purpose of completing the run a bronze bush was fitted to both dampers but later we hope to try a hard shaft in a cast iron bush. (6) One main valve seized on the O.S. damper after 9 hrs. 30 mins. The brass inserts in the ends of the gudgeon pins were wearing badly and the dust formed was sticking up the valve. In future an interference fit is to be tried for the gudgeon pin which will avoid the necessity for using any rubbing pads. (7) N.S. Yoke rubber bush (intox) after 23 hrs. This was the only rubber bush failure in the run and was probably due to the frequent rebound buffer failures. With the softer buffers the bushes appear to have a life of at least 30 hrs. | ||