distributor cam Super H worn

I fear I have larger troubles in the distributor. I put new points in and tried to gap to .020 . On two sides the gap is correct but on the next two it barely gaps the points. How much trouble am I in?
 
It either has the cam bumps worn, or more likely the bushing is toast. Check side to side play on the cam (where the rotor slips on) if you can see it wiggle in the bushing it is bad. .001" is about all the slop it can have. Rebuilt is best or replace the bushing if the shaft is not worn. Jim
 
I don't feel hardly any side to side movement. It does pull in and out maybe as much as an eighth of an inch. I think the cam is worn on two sides. Can just that top part of the shaft be replaced?
 
here's a picture
a172641.jpg
 
Rotate the cam 180 degrees so the other side of the cam is visible. The 2 lobes visible in the picture look just fine.
 
Your dist has bad bushings the lobes would not be worn in two places when they are rubbing on a piece of plastic get the dist shaft fixed.
 
Can't see much at this end because of no lighting into the distributor.

NOT sure what you've got going on, and can't from the video, but it wouldn't be the first time a distributor shaft got bent.

Would be interesting to check it in a lather and check "runout".
 
I have one on a Super A thats the same way. When you measure across the lobes they are different sizes. So far I have not been able to find just that piece. At some point I may try to get mine in a lathe and just turn it down untill they are all equal.
 
I'm going to try to remove mine this evening and see if the shaft is bent. I thought to gap the points on the lowest breaking lobe. The others would be opening more and past the .020 spec, but might work to make all cylinders fire. perplexing for sure
 
Any variation in the base square, or the tip of the rounded cam corner will cause a radical change in timing. It is not the amount of opening that really matters, it is the precision of the moment of opening. It would need total reshaping in a mill with an index head to assure it was symetrical. (not practical for a reasonably easy to replace component. Were it a one of a kind expensive component sure. Jim
 

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