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For DRIVERS, MECHANICS & FOREMEN.

22nd May 1919, Page 21
22nd May 1919
Page 21
Page 21, 22nd May 1919 — For DRIVERS, MECHANICS & FOREMEN.
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A PRIZE OF TEN ShILLINGS is awarded each week to the sender of the best letter which we publish on this page ; all others are paid for at the rate of a penny a lane, with an a1lowas4 for photographs. All notes are edited before being published. Mention your employer's name, in ,confidenci, as evidence of good faith. Address, D., M. and .r.„ "The Commercial Motor," 7-15, Bosebery Avenue, London, E.C. 1.

Lamps Alight.

, On Saturday, May 24th, light your lamps at 9.24 in London, 10.30 in Edinburgh, 9.47 in Newcastle, 9.46 in Liverpool, 9.37 in Birmingham, 9.34 in Bristol, and and 10.29 in Dublin.

Some American Tips.

The sender of the following communication Acts been awarded the 10s. prize this week.

[1974] " Sammy " (U.S.A.) writes :—"The following are selected hints which appeared recently in a wellknown American journal. They are all of general use, and, I take it, will be of interest to either mechanic or driver readers of your pages. No. 1 shows a plug for a petrol tank. It is made from rubber and a bolt with a couple of washers. The piece of rubber must be about 1,1 ins. or 2 ins, thick, and slightly less than the internal diameter of the bole, so that it will easily enter. A small hole is drilled through the centre, so that a ir in. bolt can be driven through it, and that size of bolt is then procured, long enough to project through the rubber, plus a nut and two washers, leaving a thread or two outstanding. The sketch illustrates, without need for much further written instruction, how this plug should be used. It is lowered into the vent orifice, the nut being then tightened on the bolt, and this has the effect of squeezing the rubber until it grips the sides of the hole in the tank. If the feed system to the carburetter is on the gravity principle, it will be necessary to drill a small hole right through the centre of the bolt, but if the pressure system is used, this hole must, of course, be omitted.

The second sketch is of use when making new pistons, being a self-aligning jig to carry the casting. It has the advantage of allowing the piston to be gripped at the skirt end, which is not generally strong enough to allow of the piston being chucked there. An ordinary lathe centre is used, with a disc equal in diameter to the piston mounted on the end. A rebate is cut round the edge of the disc of such a depth that the skirt of the piston will fit nicely round it, and the piston itself is held snugly in place by an eyebolt which screws into the centre of the jig, and which carries through its eye a small crosspiece which rests in the gudgeon-pin holes in the piston.

"In use, the screwed eye-bolt is first adjusted until the eye is about the same distance from the disc as is the gudgeon pin boss from the screwed end of the piston. The piston is then slipped into place, the crossbar put through The gudgeon-pin holes and the eye-bolt. By turning the piston by hand, the bolt can easily and quickly be tightened up. This operation of locating the piston on its jig can very quiqkly be carried out and, furthermore, the strain induced by the cutting action of the tool tends to tighten the bolt and render the. piston more secure in the jig.

"A not uncommon event in the workshop is the accidental breaking of a bearing cap. The repair of this happens to be an easy example of welding. As a preparatio_in file away the middle part of the crack, as shown in No. 3 sketch, but leaving the ends in the rough condition, so that when they come together, the two parts can be welded just as they were before the break took place. Commence to weld in the centre of the break, and work outwards in both directions. The edges cart be made hotter than the centre, and in consequence the metal will be found to flow better and air bubbles will be eliminated.

"It is not generally an easy task to align a cotter pinhole in the nut with that in the-'bolt. A method of facilitating this is illustrated in sketch No. 4, a small sawcut being made in the bolt in line with the cotter hole. It is then easy to judge if the corresponding hole in the nut be in line."


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