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).
The performance and issues with tyre jacks, ignition systems, spark plugs, and electrical petrol pumps.
| Identifier | ExFiles\Box 5a\4\ 04-page235 | |
| Date | 27th February 1935 guessed | |
| -5- D.B.S. Lightened Tyre Jacks. These Jacks became very hard to operate. The screwed spindles were rusty and full of grit. This has come about through the disintegration of the front end of the bottom plate (looking towards the front of the car) by loose stones flung up by the road wheels. ELECTRICAL SYSTEM. Coil Ignition. The spare contact pointsfitted at a mileage of 4,000 gave no trouble and were in good condition at the finish of 18,000 miles. Magneto Ignition. The magneto was used for a mileage of 2,000. It gave no further trouble after rectifying, as reported, at 16,000 miles. The magneto, however, should be sent back to the Makers for their comments re the tracking of the high tension current on the rotor. K.L.G. Plugs K.1.654. These plugs were a new type sent over to replace the faulty K.L.G. standard K.1 plugs. They were free from misfires and did not show any signs of pre-ignition at high speeds. There was a tendency to back fire after the engine had stopped. This was definitely more pronounced than when using the standard plugs. Electrical Petrol Pumps - S.U. The pumps failed during the latter part of the mileage. The diaphragm of one unit became loose on the spindle and allowed petrol to be forced through the joint at the spindle. This was noticed by petrol flowing from the drain hole. The trouble lies in the design. A very narrow spigot is turned on the spindle to locate the diaphragm and armature. A paper washer for quietness in operation is fitted between the armature and the spindle spigot. The diaphragm is then placed on top of the armature and held in position by a nut on the spindle. After tightening up the nut it is evidently prevented from unscrewing by lightly rivetting over. In this process the paper washer is out round the narrow spigot edge and is also flattened out. This leaves the diaphragm | ||