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).
The performance of the Gear Box, Servo, Propellor Shaft, and Exhaust System.
| Identifier | ExFiles\Box 82\1\ scan0315 | |
| Date | 9th December 1933 guessed | |
| - 5 - GEAR BOX AND SERVO LBC.3408-13-16-85. 2nd gear Mod. to Hs.{Lord Ernest Hives - Chair}1203 The synchromesh mechanism has given no trouble; ease of change has been consistent throughout the mileage. The cutting back of alternative teeth on the second speed gear has made a quieter and easier change. The use of Mobiloil NP in the box makes the changing rather heavy when cold, after becoming warmed up it is normal. It has not been necessary to replenish the gear box with oil. SERVO LOP.GB.503.GL.{G. Linnett}689-609. Linings Ferodo S.3914. The servo has been efficient. The lubrication has been scarce but sufficient. When dismantled it was noticed that the Ferodo discs had worn more on the outer dia. than the inner, the reason being that the outer bearing of the servo is not of sufficient aera and allows the servo shaft to be distorted and not work in alignement with the faces of the servo discs. This weakness has been repeatedly reported. A ball bearing was designed to overcome this same weakness on the Phantom. The outer bearing of the servo has worn allowing the shaft to distort. PROPELLOR SHAFT with needle type bearing and joint casing filled with Mobilgrease N°2. This is to make the propellor shaft self lubricating for a considerable life of the car. LOP.G.54802 incorporating N.S.3827 needle bearings. We have examined the rear end bearings of the mechanic joints and found them in an excellent condition. There has been no leak of grease and it appears to be a satisfactory solution for a permanent lubrication. The grease has not deteriorated, but our test is of too short a duration to vouch for this condition in service. EXHAUST SYSTEM LOP.EB.1155.LBC.3696. Sliding joint incorporated in front silencer. The exhaust system has given very little trouble. It is a good standard for quietness and has been free from objectionable booms when in direct drive. The booms are more n noticeable when using gears. The cutout has developed slight rattles which has necessitated adjusting the control rod. | ||