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WATER JACKET kR FUR PISTON HEAD A Cove Uv 1 WRI5T PIN BOLTS-/36 WRIST PIN BRASS:1/30 WrisT PIN BUSHING-13/ SCAVENGER SUCTION COVER | SCAVENGER WIPER RING- SCAVENGER RECEIVER UPPER BRASS-/28 LOWER BRASS-(29 CRANK PIN BOLTS-/33 THE MARINE REVIEW CAMSHAFT BEARING-3 CAMS -/09 : CAMSHAFT- 640 SCAVENGER Al PIPE 8290 PISTON HEAD-537 WORKING PISTON RINGS-558 EXHAUST PIPE 298 WorkinG CYLINDER - 256 WORKING PISTON-535 SCAVENGER PISTON RINGS -599 SCAVENGER SUCTION VALVES -1032 SCAVENGER DISCHARGE VALVES-1032 WrisT PIN-549 SCAVENGER PISTON- S535 SCAVENGER CYLINDER -246 SCAVENGER DISCHARGE COVER-/039 CONNECTING ROO 132 Houvsina 484 SPLASH PLATES - 866 HANBHOLE COVER - 184 XHAUST STANCHION 3/4 RANK PIN /67 MAIN BEARING CAP-43 CRANKSHAFT WEB-/87 BEDPLATE 62 BAFFLE PLATES: 65 -- GUARD PLATES ©6 SECTION THROUGH WORKING CYLINDER Air then enters stop-pin box-441 and drives stop pin-442 out, preventing the handle from making more than one revolution till the air is released after pressures are relieved in cylin- ders, At the same time air enters brake-box pipe-2417 and on top of piston in cylinder-relief valve-1002, forcing open the valve and allowing - what pressure there is in the cylinder to release. As hand wheel is turned cam-420 goes by the brake valve, closing the valve and venting the line. | | 16 =--==% CLA 2m Pe This releases the air pressure in stop pin box and brake-box pipe, allowing spring to force stop pin-422 back and seating the relief valve-1002. As the hand wheel is turned a projection on air-control pawl-389 catches under an engaging plate-398, which allows the bottom of pawl-389 to engage air-con- trol sector-384, forcing it to turn on the same axis. The forward 'edge of this sector pushes the _ bell-crank lever-400 over, pushing down and opening first, trip valve-431 and then, % lic p Lo 9 s i ia Cece Ce : October, 1913 control valve-424. When this is done air is released through trip-valve vent shown from underneath relay valve- 985 (the opening in valve being much smaller than vent in trip valve). The difference in pressure opens the relay valve allowing air to go to air-starting valve-928 through air-starting pipe- 2390. This brings starting air to each cylinder. As soon as control valve- 424 is open air is admitted to control- valve pipe-2407 and behind the plunger or pilot valve-939. (There are two pilot valves and air-starting cams on each cylinder, one for ahead and the other for astern; only one is shown in the figure.) One or two of the air-starting cams are in such position that the air back of the pilot valve forces it forward far enough so that the inner end uncovers the port to the top of piston of the air-starting valve- 928, forcing the valve open and allow- ing air into the cylinder, thus. starting the engine, the other cylinders tak- ing up the motion in rotation. Just as the air-starting gear has the engine going at the requisite speed, spray- air-relay valve cam-467 opens spray- relay valve-461, first closing vent valve- 470, which allows spray air to go to the main spray valve on the cylinder, starting the engine on fuel. Just as this is accomplished the projection on air-control pawl-389 disengages from engaging plate-398, the spring forcing it up, releases sector-384, which flies back closing trip valve-431 and con- - trol valve-424. This again closes re- lay valve-985, shutting air off air-start- ing valves-928. As control valve-424 is closed small vents are opened and release pressure in control-valve pipe- hk Si ae aa.