TM 5-4240-501-14PIGNITIONFLYWHEEL TYPE—INTERNAL BREAKERNOTE: Always clean breaker points after adjustment.Open the points and insert a piece of lintless paper.Draw the paper through the points. Open points whenremoving paper so it will not tear, leaving paper betweenthe points.Breaker Point CoverThe breaker point cover, Fig. 21, protects the points fromdirt. The opening for the primary and/or ground wireshould be sealed with No. 2 Permatex" or similar sealerto prevent dirt from entering the breaker box. Covershould not be distorted so as to lose its seal around theouter edge. Replace if damaged.NOTE: Engines used for winter applications use ventedbreaker covers. See Engine Parts List.Fig. 21 - Breaker Point CoverInstall ArmatureInstall governor blade and armature, Fig. 22. Themounting holes in the armature laminations are slotted.Push armature up as far as possible and tighten onemounting screw to hold armature in place.Fig. 22 - Install Armature and Governor BladeAdjust Armature Air GapThree styles of armatures have been used (Fig. 23, Illus.1, 2 and 3). Set air gap between the flywheel andarmature as shown in Table 1. With armature up as faras possible, and one screw tightened, slip the propergauge between armature and flywheel. Fig. 24. Turnflywheel - until magnets are directly below the armature.Loosen the one mounting screw and the magnets shouldpull the armature down firmly against the thicknessgauge. Then tighten the mounting screws.Fig. 23 - Armature Style VariationsFig. 24 - Adjusting Armature Air GapFLYWHEEL KEYInspect key for partial shearing. If sheared, replace.Check flywheel and crankshaft keyways for damage. Ifdamaged, replace with new parts.Install Flywheel, Nut and/or Starter ClutchRemove all oil or grease, clean flywheel hole andtapered end of crankshaft before assembling flywheel toshaft. Insert zinc key into keyway. Slip spring washerover crankshaft with hollow side toward flywheel. Totighten flywheel nut or starter clutch, reverse removaloperation. See "Remove Flywheel Nut or Starter Clutch."Torque to specifications listed in Table No. 1.27
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