Posted by jdemaris on November 14, 2009 at 16:06:30 from (67.142.130.40):
To anybody who read my former post in regard to my 1010 Deere quitting due to carbon tracking on the rotor. I finally figured it out, and I really feel like an idiot.
Here's the deal. This 1010 Deere crawler was in a fire around 8 years ago. The original distributor melted. I got a used one at a nearby tractor junkyard. It came off another 1010 Deere and had the correct number on the ID tag. So, I've been using this crawler for 8 years this way - with this distributor. I rebuilt the engine at the time and renewed all the obvious. This is a crawler that gets used ad hoc. Just once in awhile, but rarely run hard for long. This past week is the first time this crawler has run all day, every day and hard. I'm building some roads and moving a lot of dirt and rock. This is the first time I've had any igntion problems with this thing. The former post gives more detail, but I was really baffled by the new rotors shorting out due to carbon tracking. Well, after changing points, condensor, cap, many rotors, coil, plugs, checking wires, etc. . . . I finally pulled the distribor out and brought it into the shop. Guess what? The cam has six lobes on it - and keep in mind the 1010 has a four cylinder engine. After looking real close, I also found that the Delco serial # tag was not original. The original rivets were gone and some small screws held the plate on. So, ends up this distributor originally came off a Deere 4010 with a six-cylinder engine. For some reason, sombody put a 1010 ID tag on it, along with a four-cylinder cap and rotor. So, when the points opened to cause spark, the rotor was not in line with the poles and it took an extreme high voltage to jump the gap. I've come across some weird problems in the past - but this really had me going. Considering it's been running pretty good all these years - it was not something suspected. I found an old Delco-magneto conversion laying in my junkheap. Came off an old Case or IH. Has the same basic distribtor with a four-cylinder cam. But, it's real rusty. Been laying in my scrap-heap for 30 years. Well . . . spent the afternoon getting it apart, cleaning up that rusty cam, and put it into my six-cylinder distributor. Yeah the cam doesn't look too great but I suspect it will be fine. Rusty and pitted as it is, the rotor still fits snug and the points-cam isn't too bad.
The last photo shows the rotor at time of spark - pointing exactly where it should be. Big improvement.
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