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).
Faults found with the clutch, valves, and C & A washers for chassis 18.G.IV.
| Identifier | ExFiles\Box 5a\2\ 02-page338 | |
| Date | 17th December 1930 | |
| x5840. To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hotel de France, Chateauroux, Indre. 17/12/30. Re Chassis 18.G.IV. CLUTCH The clutch is giving trouble from two courses, firstly the lubrication from the gear box to the clutch spigot ball race is excessive and the excess oil from the ball race has been flung on the fabrics making the clutch slip. There is no oil catcher on this clutch and it requires one similar to the PhantomII. An examination of the clutch drawings will show you this fault. The second trouble is that no oil is fed to the clutch plate rear bearing, or the splines. The bronze bearing of the clutch plate shows the lack of any lubrication and is inclined to seize. We are drilling a .065” hole in the clutch shaft to lubricate this bearing. Thirdly the clutch trunnion sleeve can be made to seize up after approx. twelve successive engagements. This was made to have a clearance of .004” on the dia., but it does not appear to be running true and there is no lubrication, to the sleeve from the trunnion. By has looked into the question of this lubrication but it must be definitely attended to. VALVES The exhaust valves have been losing all the clearance during a 500 miles run ie. .004”. We have dismantled the cylinder head and found that the valves have hammered into the seats considerably The casting would appear to be on the soft side, as this trouble has not been apparent on other engines for some time. The exhaust valves have with the measurements we can take stretched approx. .006” in length. The inlet valves and seats do not show detoriation. We are making a thorough examination of the car and a full report will follow in due course. C & A WASHERS The reinforced C & A washers are not altogether O.K. The copper has burnt away on the inner edge and has allowed the remainder to crumple up. The cheif fault of these in the dia. of the hole which is too small for the ports, especially the exhaust, with the result that the hot gasses burn the copper away. We would advise the enlarging of this hole to the greater dia. than the port holes. G.W.H. | ||