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).
Issues and proposed improvements for the Ph.III hydraulic jack system.
| Identifier | ExFiles\Box 139\1\ scan0119 | |
| Date | 22th April 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} c. to Ev.{Ivan Evernden - coachwork} Ph.III Hydraulic Jacks. Referring to E.2/HP.21.4.36, we regret there was not enough fluid in the replenishing tank to jack up the whole car at once. This was because the near side front jack and a pump union have been leaking considerably. We happened to test the front jacks only on 32-EX on Friday and Monday and had no difficulty in jacking up the car. In spite of the modifications to the front brake linkage the brakes still bind on maximum rebound. Apart from washing the car we do not think this is a serious objection. Further, we should like to add that with the present arrangement of jacks on 32-EX, in which one pipe line supplies both front and another line both rear jacks, it is essential when jacking up the car to do so to the fullest extent. If this is not done the car is very unstable in rolling and would cause apprehension to a customer who, say, sat on the running board with the car not fully jacked up. To overcome this we suggest a tap front and rear so that any one wheel can be jacked at a time. This has a second advantage that less effort is required when changing one wheel only. There is no difficulty in arranging for a tap in the front of the car at the present junction to the off side jack but for the rear it may be necessary to duplicate the pipe lines and have the tap at the pump. We recommend some alteration be made on production as soon as possible, particularly since 340 strokes of the pump are required to jack up the front only and 650 for the whole car. Ha/Gry.{Shadwell Grylls} | ||