Modification instruction for the Wraith clutch operation to increase clearance on the first 24 cars.
| Identifier | ExFiles\Box 8\1\ 01-page61 | |
| Date | 3rd August 1938 | |
| 612 To By. {R.W. Bailey - Chief Engineer} c. to Da. {Bernard Day - Chassis Design} c. to L.A. c. to Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} Rm {William Robotham - Chief Engineer} /WRC.4/JH.3.8.38. WRAITH CLUTCH OPERATION. APPRX. GWD.795. On the first 24 cars, in order to use the existing clutch operating shafts, the existing keyway has been used and the lever G8.1921 has been turned round 180°. This arrangement does not give sufficient clearance at the point A, Fig.1 to utilize the available wear allowance on the thermoid facings, which is at least .030 per facing before the pivot heads would contact with the flywheel. The clearance at A should be .300 when the pedal is lightly depressed to take up wear allowance which is equal to approx. .225 when the pedal is up on the pedal plate. This extra clearance can be obtained by (a) Filing the lever G8.1921 .065 hollow on one side. (b) Filing a flat on the boss of bracket G8.2123 as Fig.2. | ||
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).