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 on the engine's red warning lamp behavior and running with the cut-out open on Continental roads.
| Identifier | ExFiles\Box 12\7\ 07-page130 | |
| Date | 2nd September 1930 | |
| -3- (3) On Continental roads, benefit can be derived from running with the cut-out open. The main point to bear in mind is that the periodic lighting of the red lamp in exceptionally warm weather (30°C) does not indicate that any damage or likelihood of any damage being done to the engine. Naturally, if the red lamp lights in cool weather (ats. temperature below 20°C.) it is a warning that something is wrong (short of water etc.) HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||