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At 06:41 AM 3/22/2005, Larry Snyder wrote: >Thanks much for all the advice regarding the mags on my Ercoupe. It turned >out the problem was plugs, not mags, so I dodged the bullet this time. Now >I know a lot more, though, and I would guess that at some time in the >future I will be faced with the issue of what to do with the Eisemann mags. More often than not, that will be the case. If it's rough, and not dead, it's nearly certainly the case. And, it's usuall a bottom plug. You can find the sick cylinder by starting the engine, and immediately switching to the rough mag for about 30 seconds of idling, then shutting down. If it's rough on the left magneto, it's usually the bottom plugs. Note there is some disagreement about whether the L on the switch means left is hot or grounded. :-) The exhaust manifold on the bad cylinder will be cool (be careful, the others are HOT!). Pull the plug or plugs on that one. The problem may be obvious. If a plug isn't cruddy, then suspect the wire. They can and do fail at the connector. If the plug is cruddy, put one of the plugs that you replaced at annual when the mechanic said 'it's serviceable, but you really SHOULD replace it soon' in. You did have those old plugs cleaned and kept them as spares to carry in the plane, right? By the way, you're allowed to service and change spark plugs as the owner. In this age of 100LL in 80-octane planes, more owners are having to do this. I note that this problem arose after the cross-country. At what altitude were you flying, and did you lean the mixture properly? Greg ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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