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).
Tests and proposed solutions for an oil pump leakage problem.
| Identifier | ExFiles\Box 27\1\ Scan297 | |
| Date | 22th October 1928 guessed | |
| -2- holes drilled through to the atmosphere to vent the oil to the outside of the lid.{A. J. Lidsey} These holes only just clean up on the standard lid.{A. J. Lidsey} Unfortunately we could not test this as we could not get the pump to leak. We also fitted cap nuts with soft alum. washers to the through-bolts which hold the lid{A. J. Lidsey} on, as the Test Dept. had complained of oil oozing out here. This gave no trouble either. With regard to N. Sch. 2954, our experience shows that the oil reservoir with the small lip added below the pedal would not be enough, even if the oil is sucked back when the engine is stopped. We have had bad leakers nearly empty themselves in hot weather, even if the pump is only half filled it will leak oil in some mysterious manner with changes of bonnet temperature. We intend to do a test to measure the variations of pressure in the pump with temperature under the bonnet. Since we doubt whether N. Sch. 2954 would be more than a partial cure as it stands, we suggest, subject to your agreement, that By.{R.W. Bailey - Chief Engineer} details it with the following three additions (none of which entail change of design) :- (1) Gland type of leather washer. (2) Two small holes in front of the new baffle, to drain oil down the outside of the pump. (3) Cap nuts on the four through-bolts. Hs{Lord Ernest Hives - Chair}/Tsn. | ||