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).
Technical memo detailing the testing procedure for governor control shock dampers on a 40/50 HP model.
| Identifier | ExFiles\Box 16\5\ Scan166 | |
| Date | 29th November 1933 | |
| To Mr. From Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} C. to Hd.{Mr Hayward/Mr Huddy} C. to Hy.{Tom Haldenby - Plant Engineer} C. to Hay. x7520 TESTING GOVERNOR CONTROL SHOCK DAMPERS - 40/50 HP. On the nearside of the gearbox in the frame there is a 4 way junction piece for the 1/4" diameter shock damper control piping. Only three pipes go to this junction piece, the fourth being provided so that a pressure gauge can be fitted to the system for test purposes. The pressure in the system does not rise above 30 lbs/sq.in. All pressure tests can be carried out with the rear wheels of the chassis jacked up, - although we see no reason why the gauge should not be fitted during road tests. TEST 1. Bleeding the System. At the top of the alum. valve chamber on each shock damper there is a 2 BA. set screw. In order to let the air out of the system the set screw should be taken out whilst the rear wheels are revolving. It is necessary to bleed the system when ever the pipe line is disturbed, such as the removal of a damper. If the system is not correctly bled, the time taken for the pump to build up pressure is greatly increased. This is owing to the sponginess of the air in the system. The governor unit is filled with compressor oil. TEST 2. With the damper control in the maximum position the gauge should read 25 lbs/sq.in. at 10 m.p.h. It may be necessary to adjust the control rods in order to get this figure. TEST 3. At the same speed in the minimum position, no pressure should be recorded on the gauge. If there is more than 1 lb/sq.in., it will be necessary to allow | ||