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).
Procedure for testing and cleaning choked radiators for CL Series vehicles and onwards.
| Identifier | ExFiles\Box 27a\3\ Scan031 | |
| Date | 26th July 1929 | |
| X1066. W/N. W/P. c to Hs.{Lord Ernest Hives - Chair} c to C. c to Mx.{John H Maddocks - Chief Proving Officer} Hm{Capt. W. Hallam - Head Repairs}19/MW26.7.29. re CHOKED RADIATORS CL. SERIES & ONWARDS. Pending further information on this matter we recommend the following test on all cars which come into Depots: Drain the water system completely. From the main water supply get a force equal to 4 to 5 gallons per minute. This can conveniently be tested by filling a 2 gallon tin in about half a minute. With this force of water fill up the radiator and engine If the radiator is choked to a point where it is advisable to clean it out, the water will build up in the radiator filler before the system is full. If it is satisfactory the whole system can be filled without building up in the radiator filler. If it is choked the radiator should be dismantled and cleaned out. The most satisfactory method of cleaning out radiators is by means of a strong solution of caustic soda applied to the radiator in the following manner. First lay the radiator at an angle of about 30° from the horizontal with the back of the matrix uppermost, and the top tank resting on the bench. A solution of 3 lbs of caustic soda to 2 gallons of hot water should now be poured in at the bottom tank outlet. This should be continued until the solution is up to the level of the top water inlet pipe. Wait until all the air is out of the top tank and blank off this pipe. Pour in the remainder of the soda and fill up completely with hot water. Blank off the bottom outlet, turn the radiator on end (filler cap underneath) and leave for 2 to 3 hours. At the end of this time remove the blanking nut over the top tank inlet pipe. It will be found that the solution will not discharge owing to an air lock in the radiator which will not be released until the bottom tank blanking plate is removed. CONT'D.{John DeLooze - Company Secretary} | ||