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).
Instructions for minor modifications to the Wraith's temperature control system to correct water temperatures.
| Identifier | ExFiles\Box 9\3\ 03-page080 | |
| Date | 1st January 1938 | |
| To By.{R.W. Bailey - Chief Engineer} From Km/Std. c. RHC.{R. H. Coverley - Production Engineer} WRAITH TEMPERATURE CONTROL. As a result of tests which we have just completed, we find that it is necessary to make the following minor modifications to ensure satisfactory operation of the calorstat on the radiator. (1) Adjust the end play of the shutters after the radiator and wings have been fitted up on the chassis - either before or after the front apron has been fitted - the end play should be approx. .010 - .020. Ensure that after above adjustment the shutters are perfectly free to move. (2) Adjust the shutter coupling so that there is .100 initial tension on the calorstat. This raises the average running temperature about 5°C. As attached sheets show effect of these modifications. The running temperature after making same is quite satisfactory. Comparison of the rig test figures and the road test figures indicate that the temperature range which the shutters control (i.e. between full closed and full open) is smaller on the road than on the rig. This is because vibration etc. assists the shutters to move. Will you please instruct these modifications for all Wraith chassis in order to correct the water temperatures in cold weather. Km/Std. 640 Rm{William Robotham - Chief Engineer}/Std.9/WH •1•1•38. | ||