. Field system. , loosen the eccentric cam set-screws; setcrank on rear center, open front and rear drip cocks,open throttle valve so that there is a slight pressureof steam in the valve chest and cylinder, but notenough to move piston. With the crank and shaft sta-tionary, rotate the cam until the valve is just openon the rear end, as will be made evident by theescape of steam through the rear drip-cock. Set upscrews in cam. Turn crank around and see if steamescapes from the other drip as the crank is passingthe other center. If so, the valve is set approxi-mately. 144 TO REVERSE THE DIRECTIO
. Field system. , loosen the eccentric cam set-screws; setcrank on rear center, open front and rear drip cocks,open throttle valve so that there is a slight pressureof steam in the valve chest and cylinder, but notenough to move piston. With the crank and shaft sta-tionary, rotate the cam until the valve is just openon the rear end, as will be made evident by theescape of steam through the rear drip-cock. Set upscrews in cam. Turn crank around and see if steamescapes from the other drip as the crank is passingthe other center. If so, the valve is set approxi-mately. 144 TO REVERSE THE DIRECTION OF ENGINE 506 To reverse an engine, it is necessary to move the eccentric cam as much back of the crank as itwas previously ahead. With the steam chest coveroff, put crank on the rear center. Note the amountof lead, loosen up set-screws on* eccentric cam andthrow it over past the position of the crank until it isin the same relative position back of crank that itwas previously ahead (see Cut No. 3), which will. )c7nff/e of advanceof ecceninc fonnecting rod position o/eccenincto reverse e/i^/ne Cut No. 3 be determined by the valve again coming to theposition of lead previously noted. Set-up set-screwsin the cam, and the valve is now in position to movethe engine in the opposite direction. Verify the valvetravel and lead on both ends in the usual way. Thiscan be done approximately with the valve cover onb]; using the steam from the drip-cocks as indicatorof the moment when the valve opens or has lead. 145 507 On many engines the eccentric cam is marked, and there is a corresponding mark on the shaft foreach position of the eccentric cam. One mark atwhich the eccentric may be set to cause the engineto go one way, and another at which the eccentricmay be set to cause the engine to go the other way.(See Cut No. 4.)
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