BOUR-DAVIS MODEL 20 (1920) el on 1921-22) eae. earnOnae | STAR AND LIGHTING SYSTEM INGHOUSE IGNITION. BATTERY: oe Ke Type SJWN-4, 6 volt, 102.8 ampere hour, att Type SJRN-4, 6 volt 1 ampere hour. The positive (++) terminal is groun IGNITION _— Westinghouse, Type SC. Breaker contacts separate .012 to 016 inch. They are made of tungsten. When the condition of the contacts affects the ignition, re- move and resurface with fine emery cloth or against the flat side of an emery wheel, mane on a hard oil stone. The bumper on the contact spring is fg inch off center from the line through the centers of the shaft and terminal screw, this offset being opposite to the direction of rotation of the cam. e above adjustment is made by bending the solid arm at the terminal block. A pull of 20 to 25 ounces, applied to the movable contact, is required to separate the contacts .020 inch. The spring press ure is adjusted by bending the solid arm at the point of contact with the contact spring. Resistance of the primary winding of the ignition coil is | ohm. e resistance of the ballast resistor is .4 ohm. Resistance of the secondary winding is 3700-4700 ohms. OILING.—Put 4 or 5 drops of light engine oil in the oiler at the side of the breaker box every two weeks. If the car is driven more than 500 miles in two weeks, the oiling must be done every 500 miles. TIMING.—Breaker contacts begin to separate when the top dead center mark on the flywheel is 1/2 inch past the indicator, me control lever and breaker assembly in the fully retarded position. FIRING ORDER.—The fring order is 1, 5, 3, 6, SPARK PLUG GAPS.—Spark plug gaps are 655″ he .027 inch. STARTER.—Frame 711. Starter is connected to engine throu oe a Bendix drive. Torque at 1250 R.P.M, is 2.5 pound-feet. Lock torque is 16 pound-feet, current 525 amperes. The brush tension is 2! to 3 poun OILING,—Refill starter oil wells with light engine oil every month. GENERATOR.—Frame No. 760. Generator current regulation is by third brush system. =” o) 7-11 -6.5-7.5 ‘ brik: PSS . SE ; = that at 1100-1500 R.P.M. the maximum current output is 15 to 17 amperes, at Am oF VY volts. The cold test readings are obtained with the normal setting of third brush, ul vals enerator temperature under 35°C. (95°F.). The hot test readings are obtaine after the generator has been operated one hour at 1800 R.P.M., charging i a half-charged battery or its equivalent. BLOCH Cold Test Generator Data Hot Test _ Generator Output Generator Generator Output Generatos R.P.M. peres Voltage R.P.M. Amperes Voltage 15-17. 7.5 2500. PPI 6.5-7.5 (@) Nec Field current is 2.8 to 3.25 amperes, 6 volts. Field resistance is 1.9 to 2.25 ohms as 25°C, (77°F.). Field Test, Generator Operating J old Ter ny sD) QS LAMP SE 1250. ST im cd « ot Tes F t » o Generator Output Generator Field cad a R.P.M. Amperes Voltage Current 1s @ 1250. SSD Operating freely as a motor, current flow is 3.5 to 5 amperes, 6 to 6.6 volts. aes Current output is varied by adjustment of third brush setting. Sct the third brush : 1250____12-14 8 _.6.5 2500. Generator Output Generator Fiela H. Ne om R.P.M. Amperes Voltage Current BOUR-DAVIS le 6 OILING.—Put 5 or 6 drops of light engine oil in each of generator oilers every two weeks. NESTINGNOUSE SYSTEM If car is driven more than 500 miles in two weeks, a“ must be done every 500 miles. RELAY.—Relay closes at 8-10 miles ve hour or 500-550 R.P.M. of armature, and opens — + at 6-8 miles per hour, or 450-500 R.P.M. of armature. Charging current is 1 to 2 (o) 4 amperes at closing, and the discharge current 0 to 2 amperes at opening of relay. Air gap between relay armature (moving member) and coil core is .031 inch, contacts separated. Contacts separate .013 to .018 inch. Clean relay contacts by drawing unglazed paper between them. If badly burned or pitted, resurface with well worn No. 00 sandpaper. Remove all grit. Adjust before again putting into service. Pawne U3 18. — calle Ae gy oe pee