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).
Mileage testing of an oil pump, relief valve, water pump, oil cooler, and Cadillac fan.
| Identifier | ExFiles\Box 91\3\ scan0211 | |
| Date | 8th October 1935 guessed | |
| ( 6 ) OIL PUMP & DRIVE LOP E 86843 LEC 4400 LARGE CAPACITY. OIL RELIEF VALVE LOP 86853 SPECIAL SPRING fitted replacing E 86806. SPRING load increased from 1.750 to 2.750 lbs. Compressed to .775 to maintain a pressure of 10 lbs. when idling. THE FOLLOWING NEW VALVES AND CAPS FITTED. 3 HS{Lord Ernest Hives - Chair}2153 VALVES 2 HS{Lord Ernest Hives - Chair}2155 CAPS 1 HS{Lord Ernest Hives - Chair}2154 CAP. [Handwritten in left margin: What back pressure in the cooler with the larger oil pump] The oil pump has maintained a good pressure through-out the mileage. We started with 40 lbs. at an oil temperature of 85°c. At 5,000 miles 35 lbs. was maintained. At 6,800 miles 30 lbs. was maintained. With the new connecting rod bearings, the oil pressure was brought up to 40 lbs. The fitting of the special spring to the release valve was to increase and maintain a higher pressure whilst idling. From 8 to 10 lbs. was maintained as against 5 lbs. with the designed spring. With the 8 to 10 lbs. pressure, there was a sufficient supply of oil to the tappets with clear passages. There has been only one known occasion when the new valves vibrated during the test. This was for a few moments when starting up from cold. [Handwritten over last lines of text: Cannot we make relief valve a better shape joint] WATER PUMP LOP E 87052 LEC 4545. SMALLER PUMP RUNNING AT I.I/4 ENGINE SPEED. We have had no trouble with the Water Pump. We have no knowledge whether the flow of water is greater or slower with this pump. We have noticed that there has been a good flow of water across the top of the matrix. OIL COOLER OR HEATER. LOP E 86801 E 86800 ARRANGEMENT OF MATRIX E 86793-4 OUTER & INNER PLATES. We observed after 2,000 miles a slight quantity of oil floating on the water. This indicated a leak from the matrix of the oil heater. As the quantity was only small, we continued to run the mileage. The quantity gradually increased during the further mileage and at 4,800, we decided that we had better dismantle the unit and examine the cause. It did not show a leak until we applied air pressure. The leak was then found to be coming from one tube seam in the centre at the edge? This was re-soldered, but again started to leak at a mileage of 6,800. We came to the conclusion that under the maximum oil pressure, the seam at the outer edge was not strong enough. We therefore built up the seam with solder right round the matrix approximately one eight thick, and refitted it. Up to the mileage of 10,600, there was no sign of failure which would tend to prove our theory was correct. CADILLAC FAN SELF AUTOMATIC. The Cadillac Fan was quieter at all speeds than the R.R. standard (i.e. tested before leaving Derby). It ran 6,800 miles and did not show any defects. It was efficient. There was no excessive wear of the fan belt noticeable. The R.R. type Cadillac without rubber between the blades and arm, was fitted at this mileage. | ||