Posted by Dean on February 23, 2010 at 06:13:21 from (67.172.13.37):
In Reply to: Re: 8n Ford Tractor posted by ericlb on February 23, 2010 at 06:00:05:
Bingo!
Replacement ignition switches (new or otherwise) for vintage Ford tractors are of notoriously poor quality. Often the tractor will start and run properly for 15 or 20 minutes until the switch contacts heat sufficiently to increase contact resistance enough to diminish coil primary current such that ignition secondary voltage is unsufficient to properly fire the spark plugs.
This condition is very difficult to diagnose because the switch contacts begin to cool down immediately when the engine stops if the engine stops with the point contacts open. Often the spark will appear OK when one attempts to restart the engine leading one to look elsewhewre for a problem.
Tey this: Prepare s short jumper lead with an alligator clip on either end and carry it with you in the toolbox. When the tractor next stops unexpectedly, use the jumper wire to connect the two contacts on the ignition switch and attempt to restart the engine. If the engine now starts, replace the ignition switch.
Alternatively, simply replace the $10 ignition switch.
In either case be prepared for the same problem in another 3 or 4 years.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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