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Magneto TroubleShoot
Can't rotate magneto to get timing.
1. Bendix magneto's on Lycoming engines. Magneto at extreme end of adjustment
in slots - all the way against end. Remove retaining nut from end of magneto
and remove gear. Turn gear 180 degrees. Replace gear, nut and cotter key.
Gear has an odd number of teeth. This changes timing by 1/2 tooth.
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Scratched paint under the hold-down clamp shows that magneto has been rotated from one extreme to another in an attempt to establish magneto-to-engine timing. Something is definitely wrong. |
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Broken magneto shaft. In this example even though the shaft was broken, the rough surface at the break provided enough friction that the magneto still rotated - but slippage and vibration caused engine roughness. When the mechanic checked engine-to-magneto timing he found it way off and tried to correct. There was no outward indication that the shaft was broken except that the huge change in timing and the scratched paint indicates that something inside is not right. |
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Magneto rotor showing where the shaft broke. The shaft may be a victim of other engine problems such as misalignment or mis-engagement putting a side load on the shaft. |
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