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).
Servicing of Bentley V. front dampers.
| Identifier | ExFiles\Box 152\2\ scan0184 | |
| Date | 1st April 1940 | |
| 1243 d 1245 W/P - Sr. Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham}9/WH.1.4.40. SERVICING OF BENTLEY V.{VIENNA} FRONT DAMPERS. Attached are two prints showing the arrangement of the main damping valve and the replenishing valv. in the piston. These are the only two parts which can give trouble and cause loss of damping. The most likely cause of the trouble is the main valve which can be got at without dismantling the damper completely. The valve stem (pencilled in) and the valve sleeve (inked in) must be perfectly free on each other and in the valve housing. If they tend to bind at all the valve may stick slightly open. Alternatively the valve may not be able to seat on account of the sleeve touching the valve stem cap which is swaged over the end of the valve stem. This can be checked by pushing the valve housing (shown in red) out of its holder and pushing the valve into it. There should then be .005" clearance between the top of the valve sleeve and the bottom of the valve stem cap. If there is no clearance the top of the valve housing must be ground until there is .005" clearance. If no fault can be found in the valve it will be necessary to strip the damper and examine the replenishing valves in the pistons. The two possible troubles are dirt preventing them from seating as they may have moved so far out of centre with the piston that they ride on the edge of the hole in the piston. If this has happened it will have occurred during assembly and if the replenishing valve is now centred it will be found that it will remain so. Whenever the damper is dismantled great care must be taken not to allow any dirt to get into it as even a minute quantity of dirt in the valve may stop it functioning. Rm{William Robotham - Chief Engineer}/Clm.{D. D. Clapham} | ||