Breaker Point Plunger

TM 5-4240-501-14P IGNITION FLYWHEEL TYPE—INTERNAL BREAKER Breaker Point Plunger If the breaker point plunger is worn to a length of .870" (22.1 mm) or less, it should be replaced. Plungers must be inserted with groove at the top when installed or oil will enter breaker box. See Fig. 17. Checking Plunger Inserting Plunger Fig. 17 Install Breaker Points Insert breaker plunger into the plunger hole in cylinder. Breaker points as shown in Fig. 14 are installed by placing the mounting post of the breaker arm into the recess in the cylinder so that the groove in the post fits the notch in the recess. Tighten the mounting screw securely. Use a 1/4" spinner wrench if available. Slip the open loop of breaker arm spring through the two holes in the arm, then hook closed loop of spring over the small post protruding from the cylinder. Push flat end of the breaker arm into the groove in the mounting post. This places tension on the spring and pulls arms against the plunger. If condenser post is threaded, attach the coil primary wire (and ground wire if furnished) with the lockwasher and nut. If primary wire is fastened to condenser with spring fastener, compress spring. Fig. 18, and slip primary wire (and ground wire where furnished) into hole in condenser post. Release spring. Lay the condenser in place and tighten the condenser clamp securely. Fig. 18 - Assembling Condenser and Ignition Wires When installing breaker point assemblies, as shown in Fig. 13, be sure the small boss on the magneto plate enters the hole in the point bracket. Mount points to magneto plate or cylinder with lock screw. Fasten the armature lead wire to the breaker points with the clip and screw. If these lead wires do not have terminals, the bare end of the wires can be inserted into the clip and screw tightened to make a good connection. Do not let the ends of the wire touch the point bracket or magneto plate or ignition will be grounded. Adjusting Breaker Point Gap Turn crankshaft until points open to widest gap. When adjusting breaker point assemblies as shown in Fig. 19, move condenser forward or backward with screw driver until a gap of .020" (0.5 mm) is obtained. Breaker points assemblies as shown in Fig. 20, are adjusted by loosening lock screw and moving contact point bracket up or down. Gap is .020" (0.5 mm). Fig. 19 - Adjusting Breaker Point Gap Fig. 20 - Adjusting Breaker Point Gap 2 6