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From Drivers and Mechanics.

4th July 1912, Page 37
4th July 1912
Page 37
Page 37, 4th July 1912 — From Drivers and Mechanics.
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Which of the following most accurately describes the problem?

TEN SHILLINGS WEEKLY is paid for the best communication received, and one penny a line of ten words for anything else published, with an allowance for photographs.

Workshop tips and smart repairs: long and successful runs; interesting photographs ; all are suitabk subjects. We will knock your letters into shape and will prepare sketches,where necessary, before Publication_ The absence of a sketch does not disqualify for a prize. When writing, use one side of the paper only and mention your employer's name as a guaraniee of bona fides. Neither your own nor your employer's name will he disclosed. Payment will be made immediately after publication. Address your letters to The Editor, THE COMMERCIAL :YIOTOR, 7-15, Rosebcry

Avenue, London, E.C.

Annual Bonuses are given to the most succesgul contributors.

THE SPECIAL TWO-GUINEA "LIST " PRIZE.

To connection with the above competition, which dosed on Monday last, 1st July, we are going closely into the lists submitted, and hope to be able to give the prize-winner's name in our issue for next week, dated the 11th July.

Bedding a Crankshaft.

The under of the following communication has bun awarded the 10s. prize this week.

[1072] " R.T." (Andover) writes :—" Drivers sometimes, after taking up the main-bearings of the engines under their charge, find, no matter how carefully the brasses have been let together and scraped, that the shaft binds at a certain point in its revolution and. is slack at the opposite point. This leads to rapid wear of the bearings, and also the springing of the shaft. If the two end-bearings are a good fit, and the centre journals are not properly adjusted, a hammer follows, and this continual hammering quickly knocks the bearings out. of shape. To straighten the shaft in a lathe means the expenditure of much labour. The webs have to be packed and bolted up in order to prevent, distortion. With the help of the clamp of which I send you a sketch—[We have had this re-drawn.—Enj—the shaft may be straightened without great trouble, as the crankcase itself forms the necessary support. Before commencing to bed the shaft into its bearings, the centre bearing should be entirely removed, and the small pointer should be fixed to one of the studs. This is shown in the sketch for convenience on the flywheel journal. The high part of the shaft may be detected by this pointer, which may be made up of scrap sheet metal. A stout steel plate should then be obtained, and this should be drilled in order to fit it over the studs in place of the cap of the centre bearing. When the high part of the shaft has been found, it should be turned upwards, and the steel plate should be clamped hard

down. A sharp blow with a hammer on the clamp (A) will then help to straighten the shaft. This process should be continued until the pointer shows that the crankshaft is as true as it is possible to get it. When this has been done, care should be taken with the bearings, in order to ensure a good fit. It is very important to make sure that the two halves of the brasses are tightly bedded together, for no matter how good a surface there is upon the brasses they will soon wear loose if the shaft has any play at all."

A Valve-lifter of Tubing.

[1073] " (Alexandria) writes 7--" I enclose

sketch of a handy valve-lifter---[We have had this redrawn.—Erel—which can be made in a few minutes

from a piece of iron tubing. A few days ago I had to effect a repair to the engine of my van, and found that I had lost the usual valve lifter from my kit. Ti was necessary for me to take out the valves, and as the springs were too strong for me to get them out with my fingers, and as T also object to chipping hefty pieces of skin and flesh from my knuckles. I made up the tool described, and I feel sure that it is better than the one supplied by the makers.

" The tube should be cut down with a saw, as shown in the sketch, and the centre piece which it is intended to remove may be drilled across at the bottom, with a fine drill, or it may he knocked off bodily. The remaining ends of the tube should be sprung out a little and filed up. I have found that it is better to take a little more stuff from the bottom of the tool than the ton, as this gives more room for the cotters to he got out. The sketch shows the contour of the ends. With the help of a box spanner and a small piece of wood Packing underneath, enough leverage can be got to lift the strongest spring which is likely to be met with on a petrol engine on the road."

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Locations: Alexandria, London

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