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Just when I thought I knew it all!
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Posted by Carp on May 27, 2004 at 14:25:58 from (12.27.55.243):
I just recently had a problem with my newly rebuilt 450 gas. This one took a while to figure out since I had just come in from discing 5 acres. After replacing the bendix on the starter, I started the tractor up and it ran on just 1 cylinder. I shut it down and refired a couple of times and it still ran on just 1 cylinder. Over the course of the next couple of days I fiddled and checked just about everything. Then in an attemp to find out which one was firing, I pulled off the plug wire on #1 cylinder. Then it ran on 3 cylinders. Put #1 back on and ran on 1 cylinder. After some noodling around, I decided to change the distributer cap. That fixed it. I came to find a very fine crack in a otherwise very good looking cap. This crack was arcing over to #1 cylinder, which allowed #1 to fire but pulled current from the other 3 when they tried to fire. When I unpluged #1 plug wire, that left it so it wasn't grounded and the other 3 got full spark. I thought I knew quite a bit about gasoline engines (especially old Farmall's), but this one had me stumped. Sometimes these ole tractors really throw you a curve. Does anyone else have any real stumpers they have run across.
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