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 gearbox, servo motor mechanism, and propellor shaft.
| Identifier | ExFiles\Box 5a\4\ 04-page230 | |
| Date | 27th February 1935 | |
| -3- HS{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}10/RW. 27.2.35. Gearbox & Act. Gear. 10P. G.34784. The ease of change has been consistent throughout the mileage. No gears have come out of mesh. A slackness in the rear bearing of the third motion shaft has developed. The continuous gears which whined during the first part of the test gradually became quiet, and were not noticeable at the finish. The trunnion ball race also quietened down with running. There has been a slight weep of oil from the rear bearing. The change speed lever has consistently rattled. It has not been necessary to replenish the gearbox with oil throughout the mileage Servo Motor Mechanism. 10P. G.56508. The servo was not sufficient after fitting Ferodo S.4547 friction linings; more load was required on the foot pedal. The material squeaked and was not as progressive. We have since refitted YM material which gives good results. The swinging arm friction load was maintained so that the front brakes just returned it to position. This kept the foot brakes from noticeable thumps. The spindle of the servo was in a rusty condition; it should be smeared well with grease before fitting with the scheme of no lubrication. The spring driving plate showed no weaknesses. Propellor Shaft. N.Sch.3911. CL.722 Damper. Flywheel on Transmission. We had no over-run period of rattle in the drive throughout the mileage. The load of the damper had increased to 3 lbs. at 17" radius. There was very little loss of grease from the mechanics joints. The slight leak that did take place came from the inner leather joints. At the finish of the mileage a slight slackness could be observed in the rear mechanics joint. Austin athon did not show any more than normal wear. The balancing of the propellor shaft prevented any rough period developing in the drive. | ||