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 a clutch breather, gearbox, actuating gear, and servo motor mechanism.
| Identifier | ExFiles\Box 179b\3\ img379 | |
| Date | 10th May 1924 guessed | |
| - 7 - The breather to LEO 3347 on the clutch case was not so efficient as the one fitted to 2 PER II. With this breather oil leaked past the rear engine bearing. This was cured by adapting the side scoop breather as fitted to 2 PER II. The fabrics of the clutch were in a good condition when examined. No failure of the spring drive could be detected when examined. GEAR BOX & ACTUATING GEAR LOP G 100287 RR SCH 225-233-N.S. 3830-3829 GL{G. Linnett} 578.605. The change of gears with the synchromesh mechanism was smooth in manipulation and gave no trouble throughout the mileage. At one period the reverse came out of mesh when the load was eased. This feature ceased to continue later and no gears would come out under any condition. The gears were not up to standard for quietness and the continuous gears had an uneven note when engine was idling. There was a slight leak of oil from the front drive housing past the some thread. The rear gear box support gave no trouble. A continuous rattle when accelerating came from the change speed lever. The end bearing of the change speed lever wore considerably and did not appear to get any lubrication. Under this condition the lever became very stiff and ease of change was affected. SERVO MOTOR & MECHANISM LOP G 100665 RR SCHEME 156-193. do. When its condition is 100% it is just right and up to do its job of work. A spot of oil on the fabric surfaces is sufficient to make the servo inefficient and the braking of the car suffers. It produces front brake thumps, greater wear on the link motion, as a heavy load has to be applied to the foot pedal. It causes unbalanced braking of the front and the rear as when it is efficient the front brakes are efficient otherwise they are not. The driver has seldom a consistent braking. With these conditions numerous complaints would arise under service conditions. The link motion of the brake pedal to the servo had developed considerable slack due to wear of the pins and the holes in the connecting links becoming elongated. This causes lost movement of the foot pedal. | ||