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 the cleaning of aero engine parts during servicing.
| Identifier | ExFiles\Box 143\3\ scan0054 | |
| Date | 21th December 1939 | |
| Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}2/MH.{M. Huckerby}21.12.39. RE CLEANING OF AERO ENGINE PARTS DURING SERVICING.. Soluton: Cresol (or Cresylic Acid) = 1.0% by vol. Ordinary yellow soap = .25% by weight. Remainder = water. Temperature of operation = 55/60°C. Method. Degrease the parts in a Trichlorethylene degreaser to remove the oil. Immerse parts in above solution for a suitable length of time (usually ½ to 1 hour). Remove, and immerse in or spray with paraffin immediately. The deposit can then be removed with a bristle brush or cloth and paraffin. Points to Note. (1) No advantage is gained by making the solution stronger. (2) Do not exceed 60°C or fumes will be objectionable. (3) Do not allow parts to become cold and dry before applying paraffin, or "deposit" will "bake on" again. (4) This treatment will not remove carbon deposits formed in the combustion space. (5) In making up the solution, dissolve soap first in the hot water, then add Cresol and stir really vigorously. Time of renewal judged by enfeebled action on deposits. In our case we renew solution twice a week as it is worked continuously day and night. (6) Cresol can be obtained from most tar distillers; ours is obtaindd from Midland Tar Distillers. | ||