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).
The use of colloidal graphite with the Smith's Filter during the engine running-in period.
| Identifier | ExFiles\Box 135\3\ scan0109 | |
| Date | 24th April 1936 guessed | |
| -3- COLLOIDAL GRAPHITE. The question of colloidal graphite used in the sump for running-in purposes has been carefully thought out and allowed for in the design of the Smith's Filter. For those owners who wish to employ colloidal graphite during the running-in period of their engines, we have arranged the filter characteristics so that its operation is gradual. At first colloidal graphite is allowed to pass, but after a sufficient period the filter bed builds up on the papers and the efficiency increases to such an extent that nothing is allowed to pass but pure clean oil. It should be noted that although colloidal graphite is allowed to pass in the early life of the filter, the filter is nevertheless still efficient and will not allow any foreign matter to pass through. JUDGE THE EFFICIENCY OF THE SMITH OIL FILTER BY THE COLOUR AND CLEANLINESS OF THE OIL ON THE DIP-STICK. The filter will function in any position but we strongly recommend fitting in a vertical position, that is, with the inlet and outlet connections on top. CONTINUATION NO. S.F.181 S. SMITH & SONS (Motor Accessories) LTD., CRICKLEWOOD WORKS, LONDON, N.W.2. | ||