26-27 Gas Tank Overflow Pipe Bolt

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DontKnowMuch
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26-27 Gas Tank Overflow Pipe Bolt

Post by DontKnowMuch » Tue Apr 21, 2020 1:07 pm

I am missing the bolt that holds the Gas Tank Overflow Pipe in place. It is the straight bolt that is part of the 2921 set in Lang's catalog. It is located in a place that is awkward to get at to gauge the diameter and TPI. It looks like a bolt with the head cut off and inserted backwards would work. You can't see it without standing on your head.

What is the length and thread size on this bolt?

Thanks

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RajoRacer
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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by RajoRacer » Tue Apr 21, 2020 1:20 pm

It's a set screw - I have one around here somewhere - if'n I find it, I'll measure it unless someone else has one in their hand.


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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by fordt » Tue Apr 21, 2020 1:40 pm

Just looking at it yesterday....
I believe a 1/4 X 28 screw with the head cut off and a slot cut in it will work....
FBE7EBA4-4232-4505-A8DF-1E12E5D3A6FB.jpeg

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Mark Nunn
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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by Mark Nunn » Tue Apr 21, 2020 2:32 pm

I was wondering what that set screw was for. I saw it when I replaced my gas valve last week. Apparently, my overflow tube has a plug in it.


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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by jab35 » Tue Apr 21, 2020 3:58 pm

The overall length is one inch, the unthreaded portion is 0.187" diameter x 0.575" in length, 1/4-28 thread as stated.

The length is important, the unthreaded portion passes thru a .187"+ hole in one side of the overflow tube and presses against the inside of that tube against the inside of the drain hole in the brass fitting. The hole in the tube aligns pipe and the end of the screw locks the tube tight in the socket, like a set screw. I'd seal the tube inside the fitting when installing, as it's loose fit and will leak gas if you do need overflow drainage. It will leak directly above the exhaust manifold.

Does anyone have a pic or description of the 'J' hook that secures the lower part of the overflow tube drain to the firewall? The hole in the firewall for the threaded part of the hook is less than 1/4", maybe 3/16" rod was used for that hook?

Thanks, stay safe, jb


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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by Original Smith » Wed Apr 22, 2020 11:39 am

When I first started in this hobby in 1960, I had a 1926. As I recall, that set screw could have been located in two places. In the engine compartment, or inside the car.


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DontKnowMuch
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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by DontKnowMuch » Thu May 28, 2020 3:40 pm

I have one 26 T with the overflow pipe bolt/screw hole inside under the gas tank and another 26 T with the hole accessible from under the hood.

With the two different locations for the bolt/screw, that means that the hole in external pipe is in two separate locations. I found out that the pipe on one of my 26 Ts needs to be replaced.

Does anyone know why the different locations?


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Re: 26-27 Gas Tank Overflow Pipe Bolt

Post by keen25 » Fri May 29, 2020 4:37 pm

I found one on the floor of the garage the other day and thought it came out of my crescent wrench.

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