The supply train; its organization and work . t) of the push-rod guide, and turnthe engine again until the push rod is down as far as it will the exhaust valve down; the key may now be slipped the props have been made accurately to length, the valve may-be slipped up and out, leaving the spring and the collar in should show the valve seat to be dull—not glossy—and of uniform appearance all the way around. If the seat ofeither valve is pitted or rough, or if it is worn bright on oneside, showing that it has been seating only on that side, it shouldbe reground. 62
The supply train; its organization and work . t) of the push-rod guide, and turnthe engine again until the push rod is down as far as it will the exhaust valve down; the key may now be slipped the props have been made accurately to length, the valve may-be slipped up and out, leaving the spring and the collar in should show the valve seat to be dull—not glossy—and of uniform appearance all the way around. If the seat ofeither valve is pitted or rough, or if it is worn bright on oneside, showing that it has been seating only on that side, it shouldbe reground. 62. If blocks cannot be placed on the end of the valve-lifterguide in the manner just described, it may be necessary to usea tool, called a valve lifter, made especially for the purpose oflifting valve springs. There are several styles of valve lifteron the market. One form of tool for compressing a valve spring so that thekey, or pin, can be removed from the stem is shown in Fig. tool has a hook-shaped member a to which is attached. Fig. 3 a piece of chain for supporting the lever that is used to com-press the valve spring. In engines designed with valve coversthat are depressed in the middle, the hook can be placed in thedepression of the valve cap over the valve, and in other casesit can be placed against the top of the valve itself when the valvecap is removed. A similar device can be made out of a strong string or a pieceof wire and a lever with a suitable end for engaging the spring,for instance, a long screwdriver. The string or the wire isformed into a loop, and one end of it is fastened somewherenear the top, or head, of the valve. The lever is passed through 220 Troubles and Remedies the other end of the loop, which acts as the fulcrum for thelever. Pressing down on the outer end of the lever will forcethe valve spring upwards. 63. Another tool for compressing the valve spring in orderto remove the key from the valve stem is shown in Fig. 4. Thetwo pronged en
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectunitedstatesarmy
