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AC 43.13-1B 9/8/98 g. Examine the points for excessive wear or burning. Discard points which have deep pits or excessively burned areas. Desired contact surfaces have a dull gray, sandblasted (almost rough) or frosted appearance over the area where electrical contact is made. Fig- ure 8-9 shows how the normal contact point will look when surfaces are separated for in- spection. Minor irregularities or roughness of point surfaces are not harmful (see fig- ure 8-10), neither are small pits or mounds, if not too pronounced. If there is a possibility of the pit becoming deep enough to penetrate the pad (see figure 8-11), reject the contact assem- bly. FIGURE 8-9. Normal contact point. FIGURE 8-10. Point with minor irregularities. h. Generally, no attempt should be made to dress or stone contact point assem- blies; however, if provided, procedures and limits contained in the manufacturer’s manuals may be followed. FIGURE 8-11. Point with well-defined mound. CAUTION: When inspecting the con- tact points for condition, do not open further than absolutely necessary. Excess tension on the spring will weaken it and adversely affect the performance of the magneto. i. Adjustment of magneto point gaps must be correct for proper internal timing of a magneto. See applicable manufacturer’s pub- lications for internal timing procedures. j. Check the breaker cam to assure cleanness and smoothness. Check the cam screw for tightness. If new points have been installed, blot a little oil on the cam. In addi- tion, check contact point assembly to ascertain that the cam follower is securely fastened. k. If the impulse coupling is accessible, inspect for excessive wear on the contact edges of the body and flyweights. In addition, check the flyweights for looseness on the axles. l. Further examination of the impulse coupling body may disclose cracks caused by exceedingly-tight flyweight axle rivets. m. Check the magneto ventilators for proper functioning and obstructions. If drilled plugs are used, they should be in the lowest vent hole of the magneto to serve as a drain for condensation and oil. Page 8-16 Par 8-19PDF Image | AFS-640
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