The supply train; its organization and work . ality of valve-spring tension withouttaking out the valves is to run the engine slowly with the throttlealmost closed. This will cause the cylinders whose springs arestiffer to receive scarcely any gas, and the cylinders whose valvesprings are weak will do most of the work. It is possible, how-ever, to go to excess in a test of this sort, because, whenan engine is running light with the minimum quantity of gas,one cylinder is almost sure to get more gas than another,provided the inlet valves are automatic, even with the mostcareful equalizing of th
The supply train; its organization and work . ality of valve-spring tension withouttaking out the valves is to run the engine slowly with the throttlealmost closed. This will cause the cylinders whose springs arestiffer to receive scarcely any gas, and the cylinders whose valvesprings are weak will do most of the work. It is possible, how-ever, to go to excess in a test of this sort, because, whenan engine is running light with the minimum quantity of gas,one cylinder is almost sure to get more gas than another,provided the inlet valves are automatic, even with the mostcareful equalizing of the springs. If the tension of the valvesprings is under suspicion, the valves should be taken out and thesprings tested by pressing the valve stems together, as illustratedin Fig. 5. If the springs are unequal in strength, the weakerone will be compressed more than the other. 72. Temporary Repair of a Broken Valve Spring.—A broken valve spring of the coiled-wire type can sometimes betemporarily repaired by placing a metal washer, such as is. Tig. 6 used on bolts, between the two ends of the broken washer, of course, may be of some other material thanmetal, as, for instance, hard fibre or wood. A better repaircan sometimes be made by using a rather thin metal washer. 224 Troubles and Remedies slitting it radially inwards from the edges and then bendingeach second strip thus cut upwards and the other strips down-wards, so that a sort of double cup-shaped piece is formed thatwill hold the ends of the spring in place better, if of the properdiameter, than will a plain washer. Sometimes two curvedpieces of clock spring or corset steel can be used effectively fortemporarily replacing a broken spring of an automatic inlet shown in Fig. 6, the two pieces of steel are tied to the keythat passes through the end of the stem. For tying, soft wireor even string may be used, as there is nothing to burn thestring, unless there is a back firing. The upper end of each piec
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectunitedstatesarmy
