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).
Issues and modifications related to the gearbox, suspension, and servo system.
| Identifier | ExFiles\Box 91\3\ scan0220 | |
| Date | 23th September 1935 guessed | |
| ( 10 ) When changing into third gear, the Synchromesh cone was too fierce causing a lumpy feeling on the change speed lever. With several attempts or a hard pull on the lever, the gear crashed into the mesh. The engagement of the top gear was different. There was practically no synchromeshing. The lever went easily into position with a crashing of the gears. It did not matter whether one attempted to change slowly, lightly or in various ways the gears crashed. The second gear which at first was too lumpy to engage, became quiet easy to obtain provided that the speed of the car was somewhere within the range for the use of the gear. The Gearbox was free from excessive oil leaks. There was a slight leak from the front drain tube and from the rear bearing. There was no leak from the servo drive or the damper unit drive. We took out the two inner drain pipes which we now find are not required with the other modifications. The baffle in the change speed tower prevented oil being thrown up the tower, there being no leak from the change speed lever. One pint of oil was lost during the mileage. Wakefiel'd CW Oil with 20% Hi-pressure oil was used. GEARBOX SUSPENSION NS{Norman Scott} 4460 MODIFIED TO HS{Lord Ernest Hives - Chair}2094 FRONT. REAR G 83187. The front suspension has given no trouble. The rubber does not appear to have deteriorated. The suspension failed at the rear during the run from Derby to Châteauroux. The inner steel sleeve having come loose from the vulcanized rubber. A considerable movement of the Gearbox took place, also caused a bad vibration of the change speed lever. A propeller shaft period on the over-run was set up. A new suspension was received towards the finish of the mileage and fitted. We did not consider the inner sleeve to have sufficient area to support the gearbox, considering it had only a sliding fit on the housing of the gearbox. The fitting of the new suspension cured the vibration of the change speed lever and the over-run period of the propeller shaft. We do not like the whip of the rear cross member supporting the gearbox. SERVO COUNTERSHAFT. LOP G 82820 NS{Norman Scott} 43131-27-4283 NS{Norman Scott} 4437. SUPP. BRKT. FOR FOOTBRAKE. SERVO MOTOR MECHN. LOP G 82798 SEMI SERVO SYSTEM NS{Norman Scott} 4285 G 82976/7 OP. LEVERS 35° G 82827 FRICTION LININGS. BRAKE STOP FITTED BEHIND CAMS. The servo has been very efficient and was in an excellent condition when dismantled and examined. The supporting bracket for the countershaft overcame the sponginess of the linkage to the servo. The connecting rods vibrate and rattle. The pins wear, and are a cause of rattle. The brake stop fitted behind the cams to stop chattering effect of the balls in the cams has not prevented the pitting to any extent. The bijur supply pipe to the swinging arm bracket broke off twice close up to the union, a clip was fitted to the pipe to stop vibration. | ||