HINTS ON MAINTENANCE.
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How to Get the Best Out of a Vehicle, to Secure Reliability and to Avoid Trouble.
509.—Removing the Fan Pulley From the Peerless Engine.
The fan pulley of the Peerless is sometimes found to be a tight fit on the crankshaft, and it is difficult to remove it without the use of some form of extractor. Such a tool can easily be made from the
U-bolt of the Peerless front axle, from which about 2 ins. should be sawn off the threads and the ends turnedover while hot, in the manner shown in the illustration. The cross-piece must be drilled and tapped to take a i-in. setscrew, and the tool is then ready for use. The lugs should easily slip between the spokes of the pulley so that a secure grip can be obtained.
510.—The Refitting of Ball Races on Worn Shafts.
With regard to Hint No. 500, dealing with the refitting of ball races on worn shafts, the owners of a. well-known service depot have written to us pointing out that such a method of repair is only satisfactory providing that the reduction in shaft area is not pronounced ; also the shoulders should be pro--vided with a large radius and not finished off with a knifing tool, as is frequently the case, often with disastrous effects.
Localized stresses must be avoided at all costs, and sharp corners have this defect.
They believe that building up the shaft by electric welding and re-turning is a more satisfactory, perma_pent, and less expensive.job, providing the work is placed in the hands of reliable firms equipped with up-to-date appliances.
511.—Tube Drawing and Replacement on the Yorkshire Boiler.
The boiler utilized in the Yorkshire steam wagon differs very considerably from the loco type as regards its tubes. It may be considered as having two sections, the upper or combustion chamber including the return tubes, and the lower or firebox with its tubes. In the loco-type boiler all the tubes can be withdrawn, but this isnot the case on the Yorkshire boiler, where it is difficult,to get to the top two rows at the base of the chimney.
When put in these tubes must, of course, be expanded, and to do this a special long keygoing through one side of the boiler to the expander, which is inserted in the tube when the chimney is removed, is utilized. To draw the lower tubes they must be cut off flush with the tube plate, care being taken not to damage the latter, after vihieli a tube drawer is placed in position, and if the tube cannot be moved by screwing up the nut, the dolly in the firebox is hit a smart blow with a fairly heavy hammer until the tube moves, after which it can be fairly easily withdrawn.
As the tubes in the combustion chamber of the Yorkshire cannot be got at in the ordinary way to chip them level with the plate, some other method must be adopted, and this is illustrated at the top left-hand corner of the sectional view of the boiler. Each tube is forced out of the plate by passing a blunt bar through the safety valve cover hole, resting its end on the centre of the tube and driving the tube down by means of a heavy striking hammer. Refitting the tubes is, a much easier matter, the long key being used in the manner already referred to.
The tubes in the firebox may be beaded if thought desirable. This is done by using a taper drift to turn up the edges, after which, use is made of a proper beading tool similar to that illustrated. The taking out of the Yorkshire tubes and their renewal are certainly not beyond the capacity of the average steam driver, providing that ho pays proper attention to every detail. A good point about the Yorkshire boiler is that nothing has to be dismantled before the job is tackled. Stays and stay tubes are more difficult to deal with and should only be attempted by qualified mechanics, and only then if the proper tackle, such as taps, etc., be available.