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TR2/3/3A tack drive on the distributor must have caused those cuts in the gear

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sp53

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The tack drive on the distributor must have caused those cuts in the gear; it is the only thing I can think could do it. The gear was loose inside the brass sleeve like there was a part missing at the end of gear in the housing; the bolt was in to hold the sleeve. The gear can slide back into the hosing about ½ inch and I guess cut down the side of the gear. I was going to try and fix it, but last time I tried to get one out that was stuck, I ended up using vise grips to get it out, not good. I found and extra one and the gear was sticky, but I was able to oil it up and hook the drive to a drill motor and turn it free.. Anyways this one has no extra movement in gear, good. I am afraid to take it apart because I could break it. Has anyone experienced anything like this and does anyone have a picture of how the insides of tack gear should be? I really did not hear any noise, but those cuts surprised me. I noticed it cleaning parts.

Thanks steve
 

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For the gears to mis-match that much something large would have to be missing!
 
Are you referring to the groves by the small gear? If so they were probable caused during manufacturer due to the center hub being slightly too big and the gear hob cut into it.
For it to be caused by a gear moving out of position it looks like it would have to move the gears width out of position. Hard to see how it would run like that for long enough to cause that wear.

David
 
David that was my first thought and then when I saw that the drive gear had that ½ play, I thought it must be sliding down and rubbing somehow. Plus I had 2 other gears without the cuts, but yes I do not know what is going on with this drive pedestal and it looks like no way this could happen by rubbing, so yes probably the factory. Anyways I will take more care setting this pedestal in place. I remember reading about shimming the pedestal body with gaskets to provide some room for end float.

The tack drive came out easily from the casting and gear with the cuts. With the holding nut in place, the drive gear can still slid down that half inch before bottoming out. Perhaps there is a snap ring or something in the gear assembly to hold the gear up towards the top. I cannot get the other one apart to see the whole assembly. At any rate, I am going to use the one that does not slid without taking it apart and put it back together. I do not remember the tach acting odd either.



Thanks steve
 
The instructions for getting the clearance for the pedestal are a bit confusing. I made a sketch so I could understand what they were getting at.

David
 
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