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INTERESTING REPAIR POINTERS.

29th December 1925
Page 29
Page 29, 29th December 1925 — INTERESTING REPAIR POINTERS.
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Suggestions and Experiences of Our Driver and Mechanic Readers.

IVIANY. and various are the valveseating tools to be found on the market. " W.A.S.W.," of Tiverton, suggests a simply constructed tool for recutting valve seatings without incurring the expense involved in the purchase of one or other of the production-type articles. This week's prize of 15s. is awarded to him for this idea.

An old valve is taken and the head has saw cuts made in it all round its periphery, thus turning the valve head from a circle into a saw-edged disc. The cuts are backed off and finished on an nil-stone to give good cutting edges. The lower end of the valve stem is threaded and two nuts are fitted, so as to lock together on the stem. A strong coil spring is also required of an external diameter such that it will not slip over the nuts, and a washer is needed for each end. After ease-hardeniug the head of the tool and sharpening the

cutting edges again on the oil-stone, it is ready for work.

To use the device it is placed in position in the valve guide, the coil spring with its washers is slipped over the end of the valve stem and one of the nuts is screwed up until considerable pressure is exerted between the cutting edges and the valve seat. The second nut is applied, locking the first, and a spanner is used on the lower nut to turn the cutter on the valve seat. From time to time the tool should be dressed on the oil-stone and it will be found that it has a long life. The time taken in making the tool is quite short and, with good steel, case-hardening may not be essential. TO overcome the difficulty experienced when water-manifold studs shear, of Leith, suggests a temporary fixing which can be carried in the toolbox or kept in the garage

where a fleet of vehicles is employed in which this trouble is common. A. bridge piece is first constructed so that it can be inserted in the opening in the cylinder casting, turned at right angles and then, owing to its length being greater than the width of the opening, it will hold tight when the manifold is bolted to it. Through this bridge piece a stud is fixed and riveted ; the actual length and diameter of the stud depend on the size of hole in the water manifold of the vehicle concerned. When more than one stud fails, or considerable water leakage is caused by the failure of only one, the manifold is lifted, the broken stud extracted and this temporary replacement device inserted, after which the manifold is refixed and the vehicle can carry on.

AS a rule, when an engine bearer lir, fractures the upper half of the crankcase must be replaced or welding

must be resorted to. " of Oathays, 'suggests another method of repair which he found practicable on a Dennis vehicle. He procured some *-in.-thiek angleiron, each side being 4 ins, wide, and had a piece welded across it, forming a

triangle. Two of the studs of the crankcase were withdrawn and longer ones fitted to accommodate the extra thickness of the reinforcement bracket. Holes were drilled in the angIe-iron to the required size for the studs, also two -holes of fin, diameter in the bracket and sub-frame to enable the former to be bolted to the latter. When in position, the bracket takes the load of the engine under the sound part of the broken arm and transfers it to the subframe.

ALUMINIUM is a somewhat delicate

metal, and in cases of misuse castings are likely to split if too great a load be placed upon bolts or studs which screw into them. "1111.W.," of Wigan, advocates a method of repairing fan

standards when such cracks occur, which is simple and neat, without involving the necessity for welding. In the case in question, the stud carrying the fan-bearing boss had received a Mow, cracking the standard.

To effect a repair, the radiator was drained and moved to clear the fait blades. The fan-bearing boss was detaehed and the loose stud taken ant. A cramp was attached to the fan standard and screwed up so as to close the crack; the problem then was to provide a method of clamping the split end tightly together so as to retain the stud.

A small sheet-steel clamp was made having a hole drilled in the centre to allow the stud to pass through it. This clamp fitted flat on the top of the standard, and had -two downward projections; it was of such proportions that it could only be slipped over the standard when the crack was closed by the cramp. The last-named fitting was removed after fixing the clamp, the stud was gripped tightly in its tapped hole when replaced an the fan assembly refixed.

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