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396.—Preventing Oil Leakage Past Tappets on Leyland Engines.

10th July 1923, Page 26
10th July 1923
Page 26
Page 26, 10th July 1923 — 396.—Preventing Oil Leakage Past Tappets on Leyland Engines.
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Which of the following most accurately describes the problem?

The tappets on most Leyland engines are each provided with a small hole, drilled in the-manner illustrated, to allow lubricant to pass between the tappet and the tappet guide. SOmetimes an excess of oil escapes and, the oil collecting dust, gives the engines a dirty appearance.

If each tappet be taken apart and a small oil groove .fiIed in the guide, commencing in. from the top and running to the bottom, the trouble will be overcome. Incidentally, the groove must be in direct line with• the hole in the tappet.

397.—The Care of Steam Wagon Boilers.

it is essential to open both water gauges and trycocks before filling a, boiler with water, 50 that the air can be driven out. While the boiler is taking water th fire can be laid. This is best done by placing a layer of straw or shavings on the firegrate, then a layer of wood, and a thin covering of coal or coke. When the water shows about 1 in. in the gauge glass the fire can be lit.

Keep the regulator and drain cocks open while getting up steam, so that the condensed steam can get away ; by doing this, the cylinder is warmed gradually, and the possibility of cracking the cylin.ders, due to the sudden admission of hot steam while they are cold, is done away with. This is important in •unjacketed cylinders, and particularly so in frosty weather.

When on the road keep the water half-way up the gauge glass and the pressure of the steam uniform. Olean the tube and smokebox every day, and keep the ashpan clean. A steam-cleaning jet with a flexible metallic .pipe is a useful fitting for such purposes.

Do not use the blower-pipe unless absolutely necessary; leaky tubes are caused by a too frequent use of the blower ; the same applies to the firedoorKeep it closed as long as possible.

Keep the boiler, at its working pressure, shown by the red mark on the pressure gauge, and stoke up -before meeting a. hill, so that the boiler will not be flogged while ascending. The cleaner the feed-water the better for the boiler. B42 When filling the feed-tank from a pond, put the suction hose in a bucket and then put them both in the pond or ditch, the mud or sand will then not be lifted.

Don't let the gauge-glass fittings and clack-box get choked, and when fitting a new gauge glass let the steam pass through it freely, so as to warm it gradually before submitting it to pressure.

The boiler should be washed out more frequently when dirty water has been used, and the scale removed every shed day, which should be once a week. Should the scale be hard to move, put from 10 lb. to 15 lb. of caustic soda in the boiler and steam for a few hours ; this will render the scale soft and loose. Do not fill the boiler while it is hot, and rake the fireout, and let the boiler cool down before blowing off.

The lagging should be removed annually and the plates thoroughly cleaned and• painted externally

with red oxide. When .cleaning the boiler, see if there are any signs of pitting at the water level; if any corrosion shows, scrape off the rust and paint with a thin covering of Portland cement. Test the thickness of. the plates if there is any doubt about their strength by drilling a hole and afterwards

fitting a -screwed plug. Finally, test the boiler,hydraulically, to twice its working pressure.

398.—Tbe Correct Fitting of.the Ball-joint Caps on Albion Steering Connections.

Our two illustrations show an Albion steering rod, with its cap both separate from the rod and in its correct position. It is very important to make certain when refitting the cap that the split-pin, Which is passed through it, also passes through two of the four holes in the end of the rod. This should be tested by endeavouring to unscrew the cap after the. pin has been inserted..

. The difficulty is that the cap covers the holes in the end of the red, and it is quite possible to pass the pin through the cap outside the rod, in which case vibration will soon shake it loose.

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