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).
Technical memo discussing various engine and chassis components including bearings, valves, and the gearbox.
| Identifier | Morton\M1.4\ img017 | |
| Date | 1st November 1921 | |
| To BY.{R.W. Bailey - Chief Engineer} from R.{Sir Henry Royce} -5- R7/G9/11/21 Contd. (19) NEW DEPARTURE BALL BEARINGS. A New Departure bearing should be tried for thrust purposes on the "Goshawk" axle and for the clutch. Mr. Hives reports that these bearings are obtainable in England. (20) ASSEMBLING VALVES AND VALVE SPRINGS. Some tools should be provided in the kit for dealing with this operation. The assembly will be carried out of course with the cylinder head removed from the engine. Mr. Royce thinks that one cylinder should be dealt with at a time, and each valve spring compressed separately by hand, and secured by means of a rod and cotter passing through the valve guide. A diamond shaped plate may then be dropped over the valve springs and washers, and the latter further depressed by means of bolts and wing nuts passing through the plate and two of the cylinder stud holes. The central rods and cotters may then be removed from the valve guides and the valves be put into place, together with the split circular cotters. The valve will drop by its own weight, and hold the split cotters in position while the thumb nuts securing the valve springs are released, and pressure plate removed. Drawings of this will be prepared. (21) VALVE PORTS IN CYLINDER HEAD. We should work to the last design sent through, as although the roar has been cured by other means, the alterations to the passages are an improvement as regards design. (22) FRONT SPRING. With reference to the breaking of the front spring, top leaf, the spring sheathes should be rounded off on the finishing edges where the front spring is clamped. (23) INDUCTION PIPE. Will Mr. Hives take the temperature of the gas entering the cylinders on "Goshawk II" with a view to determining the effect of the hot spot on the temperature of the charge. See also other suggestion for increasing the low speed torque. (24) GEAR BOX. I would like the three following experiments tried in connection with the silencing of the gear box:- (a) Try roller bearings for the first main shaft and side shaft. (b) Try D.W.F. ball bearings. (c) Try removing the middle bearings. It was understood that many ball bearings are rejected on account of being noisy at the Works, and returned to the makers. Some investigation should be made as to why these bearings are noisy, and if it is not due to the balls not being true spheres, or if it is due to the bearings being erected too tightly. The gear box was much quieter than when last seen | ||