Replace Coil or Armature or Both

TM 5-4240-501-14P IGNITION Magna-Matic Fig. 50 - Adjusting Rotor Timing Replace Coil or Armature or Both Usually the coil and armature are not separated, but are left assembled for convenience. However, if one or both need replacement, proceed as follows: The coil primary wire and the coil ground wire must be unfastened. Pry out the clips that hold the coil and coil core to the armature. See Fig. 51. The coil core is a slip fit in the coil and can be pushed out of the coil. Fig. 51 - Replace Coil To reassemble, push coil core into coil with rounded side toward the ignition cable. Place coil and core on armature with coil retainer between the coil and armature, with rounded side toward the coil. Hook the lower end of the clips into the armature; then press the upper end onto the coil core, Fig. 51. Fasten the coil ground wire (bare double wires) to the armature support. (Replacing coil, Fig. 51). Now place the assembly against the cylinder around the rotor and bearing support. Insert the three mounting screws together with washer and lockwasher into the three long oval holes in the armature. Tighten them enough to hold the armature in place but loose enough that the armature can be moved for adjustment of rotor timing. See Fig. 50. Attach primary wires from coil and breaker points to the terminal at the upper side of back plate. (This terminal is insulated from back plate.) Push the ignition cable through the louvered hole at left side of back plate. Fig. 52 - Shorten Cable - Model 9 NOTE: On Model 9 engines, knot the ignition cable before inserting it through the back plate. See Fig. 52. Be sure all wires clear flywheel. Remove Breaker Points Turn crankshaft until points open to widest gap. This makes it easier to assemble and adjust points later if crankshaft is not removed. With terminal screw removed, remove the spring screw. See Fig. 53. Loosen the breaker shaft nut until nut is flush with end of shaft. Tap nut to free breaker arm from tapered end of breaker shaft. Remove nut, lockwasher and breaker arm. Remove breaker plate screw, breaker plate, pivot, insulating plate and eccentric. Pry out breaker shaft oil seal with a sharp pointed tool. Fig. 53 - Breaker Box Assembly 2 14