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).
Letter providing technical advice on troubleshooting the Bijur central lubrication system.
| Identifier | ExFiles\Box 27\1\ Scan155 | |
| Date | 5th April 1929 | |
| X3806 Expl: Dept: Messrs. Rolls-Royce Ltd., Derby, Angleterre. 5th. April 1929. Hotel de France, Chateauroux, Indre, France. Y7941 Mr. Hancock from Hs{Lord Ernest Hives - Chair}/Gy. CENTRAL LUBRICATION. We note that you still are having trouble with the Bijur system. Is it that the plunger of the pump returns too quickly? We have fitted a replica of the pump on 22-EX to 19-EX and find that using Castrol R.{Sir Henry Royce} the pump normally takes 8 mins. to return. When the engine is warm, the pump returns in a minimum time of 3 1/2 mins. If you find that your pump returns in less than from 3 to 3 1/2 mins. warm with this oil, and you have not altered the drip plugs, there may be something radically wrong. We find it is absolutely no use calibrating drip plugs in drops per min. The time element is absolutely misleading. A plug may give one drop per min. in Winter, and fifteen drops per min. in summer and yet the system work reasonably well. The only manner in which a good idea can be taken of the oil a bearing obtains is by counting the total drops while the pump is making one stroke. We append a list of plugs on the 20 HP. and SS.{S. Smith} with the total number of drops we shall expect from different types of drip plugs on each chassis. (Will you please let us know the nature of your trouble.) Hs{Lord Ernest Hives - Chair}/Gy. | ||