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).
Instructions for timing, dismantling, load measurement, and testing of a slipper wheel assembly.
| Identifier | ExFiles\Box 14\2\ Scan076 | |
| Date | 3rd January 1930 guessed | |
| -2- one or two degrees. When the starting handle is released, owing to the damping friction on the plate, the timing may not go back to the position which it will assume when the engine is running. For this reason, when timing an engine with this type of slipper wheel, it is advisable to turn the crankshaft over from the flywheel end or by means of the starter motor. This ensures that the spring drive remains in the position it would be in with the engine running, and consequently, that the measured timing is representative of what it is under working conditions. (4) PROCEDURE IN DISMANTLING AND ERECTING A SLIPPER WHEEL: To dismantle the slipper wheel first remove nut 'O', then withdraw the fan pulley 'E' having removed the locking nut 'P'. Next remove nuts 'C' when the plate 'B' can be drawn off the end of the shaft. Nut 'G' should then be released, when plates 'A', 'B', and timing pinion 'D' can be removed. When erecting the slipper wheel, care should be taken when tightening nut 'O' that the taper 'Q' on the fan pulley does not tighten up the bearing 'P'. (5) SLIPPER WHEEL LOADS AND METHOD OF MEASURING SAME: The frictional load on the crankshaft damper is obtained by springs 'R'. It should be between 20 and 25 lbs. at 17¼" rad. In order to measure this load, the driving spring 'H' will have to be removed and the slipper wheel then re-erected. The load will have to be measured with the slipper wheel in position on the shaft. The load is increased or reduced by altering the size of washers 'S' behind the plungers. (6) TESTING OF DRIVING SPRINGS. The correct load of driving springs is important, and in case of eccentric slipper drive behavior, should be measured. In order to measure the strength of the driving springs 'H' the plate carrying the friction springs 'R' should be removed, and the load taken to bring the spring drive on to its stop on either side measured by means of a spring balance. This load should be between 20 and 25 lbs. measured at 17¼" radius. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||