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).
Test report detailing findings on various engine components after mileage accumulation.
| Identifier | ExFiles\Box 5a\3\ 03-page172 | |
| Date | 14th December 1931 guessed | |
| -6- With this setting, after 250 miles, we could not detect any engine gear rattles when under load or with engine idling. WATER PUMP to LOP. E.56597. E.57362 End cover and bend replacing E.51364 & E.57262. E.56627 Rotor Shaft (S/SAL.) We found that at low engine speeds of 800 revs. per min., there was not sufficient circulation of the water to keep the temperature down, and when running on the road at 4 M.P.H. for a distance of half a mile the water boiled. We made approx. 25% improvement by lessening the clearance on the rotor sideways in the pump casing. There was, as allowed by the design, a maximum clearance of .050". At higher speeds we have not experienced any trouble with the pump. The rotor shaft was in good condition when examined. TORQUE REACTION DAMPERS to LOP.E.53043. We noticed a knock from the torque reaction dampers after a mileage of 6,500. The cause was the dryness and polished state of the fabric washers. It is the first initial movement that causes the knock when the torque of the engine swings the engine over when starting away. The dryness of the fabrics causes a stickiness which we have found will double the friction load before the dampers move. We found from our previous tests that if the fabrics are soaked in oil in the first place, it will last indefinitely and overcome the above trouble. The friction load we found to give the best all round results is 3 lbs. at the end of the long arm of the outer plates. It is essential that the fitting of the dampers on the frame brings the centre bolt central in the centre plate, otherwise it will knock. The ones fitted on the car were not so and had fouled. OIL PUMP to LOP.E.53858. The release valve has stuck causing a failure of the oil pressure. When taken out, the stem of the valve showed hard marks as it it were binding. The oil pressure was O.K. after polishing off the hard marks and washing the valve seating out. Apart from this failure the oil pressure has been well maintained. OIL FILTER to LOP.E.53984. There was no foreign substance on the gauze of the filter when examined at the finish of the mileage. CARBURETTER. to LOP.E.55795. The carburetter failed on one occasion through the sticking of the air valve. This was caused by dirt entering and jamming the piston. This has been overcome on the Phantom by enclosing the ports by a shroud. The small gauze fitted to the breather pipe from the crankcase became choked up with oil sludge | ||