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 testing and condition of rear shock dampers, specifically their poundage and 'Duprene' glands.
| Identifier | ExFiles\Box 91\2\ scan0389 | |
| Date | 23th September 1937 | |
| - 20 - HFS/RH.{R. Hollingworth}1/VS.{J. Vickers}23.9.37. Rear Shock Dampers.(Continued). Actual Poundage. Top. Bottom. N.S. Inner. 39½ lbs. 44½ lbs. N.S. Outer. 75½ lbs. 74 lbs. O.S. Inner. 39½ lbs. 44 lbs. O.S. Outer. 75½ lbs. 72½ lbs. There is a foul between all inner and outer springs. Shock Dampers fitted with "Duprene" Glands. Total Mileage N.S. Damper 15019. " " O.S. " 8080. Glands. To obtain a correct fit for the "Duprene" Glands supplied it was necessary to increase the shaft diameter by .050, and also reduce the gland housing diameter by .050. In both cases this was effected by fitting press fit sleeves, which were finally sweated into position. After 6865 miles, the near side Inter. Lever failed, and whilst this was being replaced, the opportunity was taken to fit a new "Duprene" Gland of larger dimensions and delete the sleeves. After a total chassis mileage of 15019, the Dampers were returned for examination. The Near Side Gland was in good condition, and in view of this it was decided not to disturb the Damper, but merely to note its general condition, and refit to the chassis for further tests. The Off Side Gland, however, had worked out of the Housing, and it was decided to fit a lipped type Housing. General Condition. The Near Side Damper Oil Level was low (.625"), but still above working level. continued. | ||