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Originally Posted by chrs1961815
The clear cap or cutaway cap are really just for curiosity, nothing diagnostic can really be done with them. I guess you could see if the distributor body had a short in it though.
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Nu-Rex supplies a cutaway cap with their timing kit and recommends using a timing light strobe to observe the rotor action:
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Focusing the timing light on the kit distributor cap permits observation of the rotor, cam, points, and electromechanical operation under running conditions. This kit can identify arcing at advance and retard positions. The rotor brass contact positions and arcing can be seen at retard, intermediate, and full advance positions. There should be no rotor contact with the distributor contacts; motion to each side at the extremes of retard and advance should be equal. Cam wobble and point motion can also be observed for uniformity of action. Internal arcing to ground or adjacent distributor contacts can also now be observed.
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I have one but I haven't had time to set it up yet to see how useful it is.