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Tractor Talk Discussion Forum

Make a rubber grommet

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WeirdDeere

01-18-2005 01:06:43




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I've got a JD 80, and I need to replace the grommet around the fuel tank neck. Mine is dry rotted, and won't last much longer. No one reproduces it yet, and I haven't been able to find a replacement from a newer tractor. Is there any way I can use my old one as a pattern, and to make a mold for a new one? And is there a source for the rubber I would need to make the new one?

Thanks,
Brandon
My Industrial John Deere website
John Deere Diesels
The LaGrange Engine Club

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James2

01-19-2005 05:50:35




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 Re: Make a rubber grommet in reply to WeirdDeere, 01-18-2005 01:06:43  
I once made a rubber part, using a two part tire repair compound which resulted in vulcanized rubber; ie the real thing. I tried silicon and it did not look/feel enough like the original rubber. I used the original part to make a mold, but had to increase the size approx. 10% because the rubber shrinks as it cures. However two cautionary items: 1) The rubber is not cheap and there is not a lot of it, probably $60+ today 2) It is not easy to make a bigger mold. Almost anyone can easily make a mold the same size, but making it larger and retaining the correct dimensions is significantly more difficult. It really was not that easy for me. I would not spend the money, unless you are willing to spend significant time making the mold and possibly suffer occasional set backs. We have some really great two part rubber here at work which does not shrink (used to copy internal dimensions which can then be measured), but the darn stuff is blue.

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markct

01-18-2005 09:59:22




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 Re: Make a rubber grommet in reply to WeirdDeere, 01-18-2005 01:06:43  
mcmaster carr has all sortsa rubber grommets, possibly one of them might work? or could be timmed down to work. also you could machine a new one outa rubber, rubber machines best with a very sharp HSS tool and freezing the rubber to make it hardest



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Gerald J.

01-18-2005 07:25:12




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 Re: Make a rubber grommet in reply to WeirdDeere, 01-18-2005 01:06:43  
You can use pourable silicone to make the mold and to make a reproduction part in that mold.

Gerald J.



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Leroy

01-18-2005 18:06:38




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 Re: Make a rubber grommet in reply to Gerald J., 01-18-2005 07:25:12  
Where would you find this stuff?



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dr.sportster

01-18-2005 19:26:21




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 Re: Make a rubber grommet in reply to Leroy, 01-18-2005 18:06:38  
They might sell that at an art supply store.



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Jerry Cent. Mi.

01-18-2005 13:10:39




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 Re: Make a rubber grommet in reply to Gerald J., 01-18-2005 07:25:12  
Have you tried John Deere. They are very good at servicing the parts for the older tractors. Pricy but available. Maybe



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