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).
Guide on the properties and usage instructions for Prestone coolant.
| Identifier | ExFiles\Box 151\3\ scan0127 | |
| Date | 16th December 1929 guessed | |
| 1. Cost. Prestone does not boil away under normal operating conditions, and can only be lost by leakage or through the overflow pipe. Prestone can be used throughout the season and saved for the next season without deterioration. 2. Effect on Finish of Car. Prestone has no effect on paint, varnish or cellulose lacquer, and if accidentally spilled does not mar the finish or nickelled surface. 3. Odour. Prestone is practically odourless, and thus no objectionable vapours are given off from the radiator when the engine is hot. 4. Inflammability. The vapour given off from Prestone solution during the normal operation of the motor is only water vapour and therefore is non-flammable. Other compounds on the market have been found to give off vapour which is distinctly inflammable. 5. Corrosion of Circulating System. Prestone does not corrode any of the metals used in the radiator, has no effect on the soldered joints, and does not tend to attack rubber hose connections. 6. Operating Temperatures. Since the addition of Prestone to water does not materially raise the boiling point, the temperature of the engine is kept approximately the same as is the case when water alone is used. Further, solutions of Prestone are not at all viscous, and therefore there is no danger of local over-heating due to improper circulation in the cooling system. Directions for Use of Prestone. To obtain the best results with Prestone the motorist should make sure that the entire cooling system of his car is free from rust, scale and leaks, and the following directions should be observed :— (1) Remove rust and scale from radiator and water jackets if necessary. For this purpose a 5 per cent. solution of washing soda circulated through the system for ten minutes is found to be more effective than plain water. If it is necessary to use this solution, great care must be taken to remove it before filling, by thoroughly washing with water, and the removal of hose connections while flushing will facilitate draining off the rust and scale. (2) Tighten all parts of cooling system including hose and pump connections, gaskets, expansion plates, drain cocks, pump glands and grease cups on water pump, and examine the cooling system periodically to make sure that there are no leaks. (3) Determine water capacity of cooling system. Add a gallon of water, then add sufficient Prestone to give protection at the desired temperature (see Table on page 4). Afterwards fill radiator with water to a point 4 inches from the top of the overflow pipe to prevent loss by expansion, and run engine in order to thoroughly mix the solution. (4) Prestone cannot be lost by evaporation under normal operating conditions, but the water may vaporize, and should be replenished as required by re-filling to a point 4 inches below the overflow. The necessity of adding abnormal quantities of water is evidence of a leak in the cooling system. AFTER FIRST FILLING THE RADIATOR WITH PRESTONE SOLUTION, NO FURTHER ADDITION OF PRESTONE IS NECESSARY UNLESS A LEAKAGE IS FOUND. | ||