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By Deyomatic - 8 Months Ago
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I'm wondering if anyone knows how much pressure this speedo fitting is under.
Some of you may have been following my story about swapping in an oddball AMC transmission that's essentially a Ford 3.03 with a planetary gear OD setup on the back...
Anyway- I want to cap off this speedo (of course it's the spot that's the tightest location) but I don't know how much pressure this is under. One guy using the same transmission said he used silicone to plug it up but I'm not sure I understood what he plugged up. The threaded piece fits over the crimped nipple. The guys on the HAMB said to put a rubber cap on it. I'm not so sure that the rubber cap I have is stout enough, but it fits.
Looking for thoughts on how much pressure this fitting is under...and how else I can get rid of it...Can I snip this crimped part off completely? Should I remove the blue gear?
Thanks in advance.
  
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By miker - 8 Months Ago
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Shouldn’t be under any hydraulic pressure. I think the suggestion of a “rubber plug” referred to the expanding kind, like they make to replace soft plug (freeze plugs, core plugs, whatever you call them). I don’t quite understand how it all goes together, but pull the gear, put the housing in with the o ring on it, and I’m guessing the other part secures it. Plug the middle with whatever will work.
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By paul2748 - 8 Months Ago
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Can you make up an aluminum plug the size of the part that has the O ring and hold it down with the factory clamp?
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By Deyomatic - 8 Months Ago
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Sounds good, Miker. Thanks.
I had one suggestion to weld up the hole in the threaded part...I might try a rubber cork first, assuming I can get one the right size. If that doesn't work, the threaded part is getting welded.
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By miker - 8 Months Ago
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Someone may correct me, but I wouldn’t use a cork. Even the ones from a good bottle of wine. If that center “pin” is where the drive cable went, and that’s the leak, a good cleaning in solvent to get the oil out, a bit of lacquer thinner, and then some JB weld might work. But a touch of weld would be better.
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By Deyomatic - 8 Months Ago
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I took all the pieces out today and welded up the back end of the threaded piece just enough so it still inserts where it is supposed to...then I used RTV to make seal the two parts together. Fingers crossed, it's good.
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