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Disassembling Motor problem with clip/u-nut

Disassembling Motor problem with clip/u-nut

Old 11-09-2019, 09:38 AM
  #1  
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Default Disassembling Motor problem with clip/u-nut

I am in the process of rewiring the original motor for my Pfaff 130-6. But, I've run into a problem. on one side of the motor there is a bolt that goes into a clip nut/u-nut and I can't get the threads to catch and there can't remove the bolt to completely disassemble the motor.

img_1591.jpg

Any suggestions?

Thanks,
Tammy
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Old 11-09-2019, 05:31 PM
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Maybe you can try chasing the threads with a die nut....

Here is a youtube video that shows what I mean.

https://www.youtube.com/watch?v=qPk6HBvnhK0

this link shows pictures of die nuts...they come in different sizes.

https://duckduckgo.com/?q=die+nut&t=...ages&ia=images
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Old 11-11-2019, 09:23 AM
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I think, it is likely that I can't get the double ended threaded rod out because of thread damage. But, if I can't the rod out, there is not way to chase the threads. I do have a set of die nuts.

So my problem at the moment is that I haven't figured out how to remove the rod. After I get the rod out then I can see if the threads can be repaired or come up with a replacement.

I've tried pulling up and pushing up on the rod as I turn but I can't get the threads to catch. I guess I might be able to cut the u-nut off but the space is so tight I'm not sure I can do that.

Any thoughts on how I could remove the threaded rod would be greatly appreciated.

Tammy
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Old 11-12-2019, 08:05 AM
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It's gonna take more force than just "pulling up" on the bolt. If you can get a pin punch through from the other side (nut end) give it a good whack to distort the clip/nut. If not wedge under the square of the bolt to engage the nut. Those nuts (also called tinnerman nuts) are stamped steel and distort when the fastener is tightened. They don't require "good" threads on the bolt for engagement, but the edges of the nut do need to engage a thread- which is why they must be forced into shape.
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Old 11-12-2019, 10:50 AM
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Can you take a close up picture looking down (ish) where the shaft comes out of the motor? Hubby wants to see that angle. He thinks the "bolt" is actually the motor shaft which won't come out/off.
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Old 11-12-2019, 11:46 AM
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If you do FaceBook, maybe this Pfaff 130 group can help you.
Look for: PFAFF 130 Owners Resource Group
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Old 11-15-2019, 04:21 PM
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Originally Posted by ttatummm View Post
I am in the process of rewiring the original motor for my Pfaff 130-6. But, I've run into a problem. on one side of the motor there is a bolt that goes into a clip nut/u-nut and I can't get the threads to catch and there can't remove the bolt to completely disassemble the motor.

Attachment 619493

Any suggestions?

Thanks,
Tammy
The clip nut is likely broken and the threaded rod is just spinning the nut. I run into a similar situation as an aircraft mechanic. Your best hope is to cut the rod off at the exposed hex head. How ever a new rod might be very difficult to get
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Old 11-16-2019, 03:18 PM
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Thanks for the information about the Tinnerman nuts (learned something new). I got the motor apart. There was no way to give the bolt a good wack from the nut end, and I broke the Tinnerman nut trying to pry the prongs up. But I was able to get the motor apart, so now I can take care of the wiring and clean up the motor.

There is a fairly wide and deep grove in the existing double threaded rod, so I might have to replace it (maybe with a threaded rod).

Your response was very helpful, Thanks.

Tammy
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