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).
Modifications to ball valves and the addition of a filter in hydraulic shock dampers for the 40/50 HP chassis.
| Identifier | ExFiles\Box 16\4\ Scan225 | |
| Date | 8th December 1930 | |
| c. Ha/Rn.{Mr Robinson} X7520 BY/HEB{H. Biraben}14/M.8.12.30. 40/50 HP. CHASSIS R.H.& L.H. REDUCED MOVEMENT OF BALL VALVES & ADDITION OF FILTER TO VALVES IN HYDRAULIC SHOCK DAMPERS. REAR HYDRAULIC SHOCK DAMPER SEC:7150. FRONT HYDRAULIC SHOCK DAMPER SEC:7160. Further to our memo. BY/HEB{H. Biraben}9/M.21.11.30, please receive herewith one Blue Print of each of the following drawings detailed to Scheme 1406 as proposed for future Production.- SEC:7150/60.- F.83159 Valve Cover Plug(H.P.)which replaces F.81387 - 2 off, on Sec:7150 & F.81399 - 2 off,on Sec:7160. SEC:7150 -ONLY.- F.83169 Valve Spring. which replaces F.80991 - 4 off. SEC:7160 -ONLY.- F.83160 Valve Cover Plug(L.P.)which replaces F.81387 - 2 off. F.83167 Valve Plug(Filter Body) " " F.79413 - 2 " F.83168 Stop Pin(Valve Plug) " " F.83088 - 2 " F.83170 Valve Spring(H.P.) " " F.80992 - 2 " Will you please instruct up the above parts as required, together with the following standard or existing parts.- SEC:7150.- F.75760 Joint Washer(Adjusting Screw). 4 off. ADDITIONAL. F.57600 Adjusting Screw(Ball Valve).4 off,which replaces F.79616 4 off. F.78476 Cage(Air Release Filter). 4 off. ADDITIONAL. F.78477 Washer( " " " ). 4 " F.78478 Gauze( " " " ): 4 " Remaining parts to complete Sec:7150 are standard to LOP.F.79925. SEC:7160.- F.75760 Joint Washer(Adjusting Screw)2 off,which replaces E53551 2 off. F.57600 Adjusting Screw(Ball Valve)2 off,which replaces F77983 - 2 off. F.78476 Cage(Air Release Filter) 2 off. ADDITIONAL. F.78477 Washer(Air Release Filter).2 " F.78478 Gauze( " ).2 " -Contd- | ||