TM 5-4240-501-14PIGNITIONFLYWHEEL TYPE—INTERNAL BREAKERBreaker Point PlungerIf the breaker point plunger is worn to a length of .870"(22.1 mm) or less, it should be replaced. Plungers mustbe inserted with groove at the top when installed or oilwill enter breaker box. See Fig. 17.Checking PlungerInserting PlungerFig. 17Install Breaker PointsInsert breaker plunger into the plunger hole in cylinder.Breaker points as shown in Fig. 14 are installed byplacing the mounting post of the breaker arm into therecess in the cylinder so that the groove in the post fitsthe notch in the recess. Tighten the mounting screwsecurely. Use a 1/4" spinner wrench if available. Slipthe open loop of breaker arm spring through the twoholes in the arm, then hook closed loop of spring overthe small post protruding from the cylinder. Push flat endof the breaker arm into the groove in the mounting post.This places tension on the spring and pulls arms againstthe plunger. If condenser post is threaded, attach thecoil primary wire (and ground wire if furnished) with thelockwasher and nut. If primary wire is fastened tocondenser with spring fastener, compress spring. Fig.18, and slip primary wire (and ground wire wherefurnished) into hole in condenser post. Release spring.Lay the condenser in place and tighten the condenserclamp securely.Fig. 18 - Assembling Condenser and Ignition WiresWhen installing breaker point assemblies, as shown inFig. 13, be sure the small boss on the magneto plateenters the hole in the point bracket. Mount points tomagneto plate or cylinder with lock screw. Fasten thearmature lead wire to the breaker points with the clip andscrew. If these lead wires do not have terminals, thebare end of the wires can be inserted into the clip andscrew tightened to make a good connection. Do not letthe ends of the wire touch the point bracket or magnetoplate or ignition will be grounded.Adjusting Breaker Point GapTurn crankshaft until points open to widest gap. Whenadjusting breaker point assemblies as shown in Fig. 19,move condenser forward or backward with screw driveruntil a gap of .020" (0.5 mm) is obtained. Breaker pointsassemblies as shown in Fig. 20, are adjusted byloosening lock screw and moving contact point bracketup or down. Gap is .020" (0.5 mm).Fig. 19 - Adjusting Breaker Point GapFig. 20 - Adjusting Breaker Point Gap26
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