182.—The A.E.C. Induction Pipe Support and an Improvement to the Sub-frame.
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In our issue for November 29th, 1921, we published, under the heading of "Roadside and Garage," a letter from a correspondent, entitled " A.E.C. Improvements." We have since reeved from the
buildersof this vehicle some particulars of the bracket provided for supporting the inlet manifold on the Tylor engine utilized on the A.E.O. They also point out that the carburetter fitted to the three-four-ton chassis has a flange which fits against the bottom of the water-jacket, being held in position by two studs.
The letter from our correspondent was somewhat misleading, as it gave the impression that the carburetter and induction pipe are not supported in any way on the standard vehicle. This, however, is not the case, for at the point where the studs are positioned for the carburetter is fitted a support bracket which is, roughly, an S-shaped stamping with four holes at one end which fit over the aforementioned studs. At the other end of the bracket is a single hole through which is passed the crankcase bolt immediately behind the carbuvetter. Incidentally, the part number of this bracket is T.11.3490. Now, as regards the sub-frame, the suggestion put forward by " EA.," the writer of the letter referred to, for supporting this sub-frame is quite good, but the makers suggest that 'their own method, whilst being just as good, is less expensive. In cases where the sub-frames have become loose, the rivets are cut out and replaced by fitted bolts, which are well riveted over the nuts. As these bolts are intended to be a permanent fitting there is no object in pro-. viding spring washers, locknuts, or pins.
Two special wooden blacks (part number B6405) are also slipped under the sub-frame on each sidebetween these and the front cross-member, being held in position in each case by two long bolts.
183.—The Examination and Repair of Accumulators in Opaque and Sealed 'Cases.
Storage batteries now form part of the lighting and starting equipment of many vehicles employed on goods and passenger transport, but a great many, users are somewhat chary of interfering -with these batteries when they go wrong, particularly if they are of the sealed type and not contained in celluloid boxes. When the usual routine methods of charging fail to bring accumulators to their normal condition, an examination of the interior of the cells should be carried out.
While nearly every mechanic is familiar with the ordinary type of accumulator, it is certain that many quite competent men refrain from tackling the particular type of battery the cells of which are not transparent, and which are often tightly cemented together -under a thick coating of Chatterton's compound and contained in wood boxes. These batteries, with their composition or ebonite cells anct cell tops :and leai connecting bars sealed to the terminal pests' may appear formidable, but with appropriate toolsand methods they ean easily be taken in hand.
Only two tools are required—one is an 8-in, length of 1-in. or t-in. round iron or steel, and the other a copper bolt hammered into the shape of a wedge. The first tool is used when heated to a goad red heat, in order to unseal the lead bars connecting the terminal posts. The second tool is employed at a reduced heat to melt the compound or cement which fills the space between the bevelled edges of the cell covers and the sides of the cells.
When commencing the repair or examination, the order of procedure is as follows : Having drained the liquid from the cells, suspend the battery by means of a stout cord passed below and through the lead connecting bars, and carefully drive the wood outer casing free of the cells 'by ta_pping alternately the metal handles which are provided at each end of the easing, using a mallet or light hammer and, a piece of hard wood. No difficulty should be experienced in extricating the cells. If the cell tops have been. covered with compound, wedge • the cells slightly apart. This will free them sufficiently to allow each to be detached from the lead connecting bars when these are unsealed from the terminal posts. To perform this operation apply the heated iron exactly above the centre of each terminal post. Connecting bars, when fitted, have taper holes, which accommodate the tapers of the terminal posts. They are premed on, and are sealed, and
once this sealed surface is melted by the iron, they can easily be detached.
The plates must now be removed lrom the cells and to do so, after the sealing compound has been melted away, simply grip one terminal post firmly in the vice and pull the cell from the plates, which are then available for inspection. Repairs may be carried out according to the condi • tion of the plates, these, of course, being similar to those utilized in celluloid batteries. They may require repasting, in which case the old paste should be removed. Where wood separators are employed these, if perforated or cracked, or if they show signs of much chafing, must be replaced by new ones. The process of reassembly should present no difficulty, but care should be taken in restoring the plates to the cells. The former should be firmly pressed together, as the oells are fragile.