Locomotive boilers ; Steam cylinders and valve gears ; Locomotive management ; Breakdowns ; Compound locomotives by International Correspondence Schools

Author:International Correspondence Schools
Language: eng
Format: epub, pdf
Tags: Locomotive boilers, Locomotives, Locomotives
Publisher: Scranton, Pa. International Textbook Co.
Published: 1902-03-25T05:00:00+00:00

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standing. With the leak in the under side of pipe, however, water will leak to the cylinders when the water is carried high in the boiler.

POTTNBS.

51. Causes and Remedies.—A pound in an engine is destructive to the engine, besides being a great source of annoyance to the engineer, and if it is of such nature that it can be remedied, this should be done as soon as possible. A common cause of an engine pounding is worn main-rod brasses, which cause a sharp pound as the main pin passes the centers.

Loose wedges in the driving-box jaws cause a pounding that should be located and remedied as soon as possible, as there is danger of breaking the driving boxes. To locate such a pound, place the engine on the top quarter, block the driving wheels, put the reverse lever in the comer, and admit a little steam to the cylinder. Work the lever back and forth, and the action of the steam in the cylinder, as it is being shifted from one end of the cylinder to the other, will cause the boxes to be worked back and forth in their pedestal jaws, if there is enough play there to cause pounding. This method will also locate loose or broken driving-box brasses.

If there is too much play between the guide bars, the cross-heads will cause a very disagreeable pound when the engine is working hard at slow speeds, and, also, there will be a tendency to bend the piston rods. This pound should be stopped either by closing the guide bars the proper amount or by lining out the crosshead gibs, or retinning them, as the practice may be.

A piston loose on the piston rod, or the rod loose in the crosshead, causes a severe pound, and sometimes the piston works off far enough to knock out the front cylinder head. The remedy for this defect is obvious.

Worn side-rod brasses arc liable to cause a pound; if they are very loose their side motion will cause them to rattle badly.

If the main rod has been lined out too long, it will allow the piston to strike the front cylinder head; or, if lined out too short, it will strike the back head. In either case, a bad pound will result when the main pin passes the front or back center,

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respectively. This pound can be easily located, when the throttle is closed and the engine is drifting, by noting on which center the pound occurs. Another way is to note on which end of the guides the crosshead overtravels the travel marks. If the crosshead passes the marks on the back end of the guides, the main rod is too short and should be lengthened by changing the liners from the back to the front side of the main-pin brasses. If the crosshead passes the marks on the front end of the guides, the rod is too long and should be shortened by taking the liners from in

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