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H firing problem

A

Anonymous-0

Well-known Member
I had another post on here a couple of days ago about my H
that would not start. It was acting like it was way out of time.
I have it running now. When the engine is cool it runs fine,
but when it warms up it starts missing. I pulled the distributor
cap off and one side of the plastic part of the rotor was
melted. I looked inside the cap and three of the prongs had
black streacks running from them going back to the rotor. I
changed the cap and rotor, when I started it back up it done
the same thing it done fine at first then started missing again
with the same results to the new cap and rotor. What would
be causing this. The distributor has new points and condensor
that I just put in. I am also running a MSD box on this tractor
because it is only used for pulling. Thanks for any help
 
You have bad (open) sparkplug wires OR the rotor is not quite where it's supposed to be when the coil fires. Either situation will cause the spark to seek an easier path to ground than the sparkplugs, tearing up the cap and rotor on the way.

The rotor needs to be physically near a high-tension terminal when the coil fires. This can be determined by using a cap with a hole cut in it and then running the engine in a dark area and watching the spark jump from the tip of the rotor to each terminal. I have seen custom ignition setups with problems (a misplaced pickup coil) that sparked when the rotor was almost in between neighboring high-tension terminals.
 
I have MSD plug wires on it. The other day when I could not get it to start the engine would kick back like it was out of time. I advanced the timing on the distributor some and it started. Is it possible that it jumped time and now that I advanced it, its running but the rotor is actually not at the right spot when the coil fires?
 
Bob is very correct. A piece of tag board with a hole in it for the rotor shaft and marks for the clip locations for the cap, can help locate the position of the rotor. Put the rotor on over the paper, put a plug in the coil wire, and ground it. Then turn the engine slowly and watch where the rotor points at a spark. then compare it to the cap ! Jim
 
Ok I understand what you guys are saying what is probably wrong and how to check for it. But what causes this and how would I fix this problem?
 
Broken rotor drive tab inside
Wrong rotor
Wrong cap
Wrong set of points (very possible if they are not the stock type as the rubbing block might be in the wrong place. Jim
 
I wonder if you have a problem with the distributor shaft or bearings allowing it too wobble a little. Check it for side to side play.
 
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