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).
Instruction to drill a small air leak hole in the water temperature regulator valve disc on a 40/50 HP chassis to allow the system to drain properly.
| Identifier | ExFiles\Box 78\1\ scan0038 | |
| Date | 5th February 1920 | |
| X.3563 To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " Bn.{W.O. Bentley / Mr Barrington} " " Hs.{Lord Ernest Hives - Chair} " " Ck.{Mr Clark} E1/G5.2.20. X.3563. - RE WATER TEMPERATURE REGULATOR 40/50 H.P. CHASSIS. When it is desired to drain a car fitted with the watertemperature regulator, unless the valve seat of the top regulator valve is poor, the water should ne held up owing to the lock formed by the valve. Would you kindly arrange to have a small hole drilled through the valve disc to form an air leak and th enable the water to drain away without fail. E.{Mr Elliott - Chief Engineer} | ||