The front distributor was designed to come off of the tractor to replace/adjust the points. Remove the wire on the coil, remove the coil bail, remove the distributor cap & take the two bolts off. The base of the distributor has an offset tang & can only go back one way unless you really force it on. Look at how the points & condenser set in the distributor before you start pulling it down! If this is your first time doing it, draw a sketch! Make sure you are using quality parts; the points should have a phenolic rubbing block & not the cheap white plastic crap. Be careful not to ground the tip of the condenser wire to the body of the distributor when you replace the points. Do not break the little copper strip that goes to the points. (If you do, make another out of the old set of points) Also, make sure the condenser wire does not go through the same opening in the distributor that the coil pig tail does. The condenser wire goes the opening on the top right. Look at the old points; are they burned, pitted or mis-aligned? Check the point gap, .015 on all four lobes. Make sure you have the star washers under the screws on the points.
Once you get the points in & set, check the timing. If you don't know how to do that, ask.
Before you put the distributor back on the tractor, do a complete continuity check.
First, make sure your meter/light works (don't ask....)
Now, follow these steps:
1. Coil off, cap off, points open. One probe on the brass screw & the other on both sides of the open points. On the side closest to the cam, you should have continuity. Not on the other side! If you do, you will also have continuity everywhere because the points are grounded.
2. Coil off, cap off, points open. One probe on the brass screw & the other anywhere on the body of the distributor. You should have no continuity! Now, rotate the tang on the distributor....as the points open & close, you have continuity (closed) and lose it when they open.
3. Coil on, cap off, points open. One probe on the lead on the top of the coil, the other on the cam side of the open points. You should have continuity!
4. Coil on, cap off, points open. One probe on the lead on the top of the coil, the other anywhere on the body of the distributor. You should have no continuity!
At this point, I just put the distributor, coil & cap all back on the tractor as a unit (it’s easier to do this from the left side). The reason I do this is because it is real easy to get the cap or coil mis-aligned trying to put it back together one piece at a time & the result is something gets broken or you get a ‘no spark’ problem.
Yes, it's possible to put it back on wrong & break it.
Look at the slot on the end of the cam shaft. What ever angle it happens to be, turn the distributor tang to match it. (close counts)
Then place the distributor on the front of the engine, gently push it in place & slowly turn the distributor body until you feel the tang slip into the slot. Rotate the distributor body until the bolt holes line up. Then, hand tighten the two bolts until the distributor body is flush w/ the timing gear cover.
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