NAA Fuel tank plug question

Dave Wave · Jun 21, 2013

So I got a new fuel tank for my NAA. The tanks came with two outlets in the bottom. One In the center (55+) and one on the side (53-55). It came with a bolt to use as a plug.

This is a straight bolt in straight threads so it does not tighten until it bottoms.

As the quality of the tank surface leads me to think "leak", I was wondering the best way to seal it shut.

My first thoughts were form a gasket on the upper threads and matting surface, or an aluminum crush washer.

Any other ideas?

Thanks,

-Dave

Anonymous-0 · Jun 21, 2013

plumbers tape works good...phil

hippie1st · Jun 21, 2013

with out seeing the tank and bolt. I would think
cork gasket or a banjo washer.

souNdguy · Jun 21, 2013

assume you are trying to plug the entral hole.

why not doit like ford and god intended. an oring.

would take 5m to make a blank off plate to use the 2 screw connections.. etc..

Dave Wave · Jun 22, 2013

I thought about that, but there is no grove for the o-ring to sit in. Just two "flat" surfaces where the bolt meats the surface of the tank.

Do they make a taper plug that would work like a pipe plug?

Thanks,

-Dave

souNdguy · Jun 22, 2013

use a washer to backup the oring. kinda like a bonded ring setup. even without. you re crushing an oring in place, in a non pressurized sump.. not much reason for it to blow out..

Dave Wave · Jun 22, 2013

(quoted from post at 13:29:02 06/22/13) use a washer to backup the oring. kinda like a bonded ring setup. even without. you re crushing an oring in place, in a non pressurized sump.. not much reason for it to blow out..

Like a washer with an ID just larger than the OD of the oring on the bolt?
So as the oring flattens out, the washer keeps it from flatten out too much?

Just trying to visualize what you are suggesting.

Thanks,

-Dave

souNdguy · Jun 22, 2013

yup. thin washer. one thinner than the oring, even when compressed. as the oring compresses, if it tries to increase in diameter, it is stopepd by the ID of the washer. so obviously washer and oring diameter have to be larger than the hole in the tank. optionally, a piece of silicone rubber sheeting could be slipped in there.

anything to make a flat face seal.

if you wanted to get fancy.. you could take your steel blank plate. mark an oring profile on it, and then dremil in a groove or use a broke wood spade bit that had no center point but did have side points.

I think the washer is the easies. you used to be able to get bonded washers at hyds places. esentially a thin washer with an oring 'glued to the id. oring was thicker than washer.worked ok on leaky banjo connections.

NAA Fuel tank plug question

Dave Wave

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Anonymous-0

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hippie1st

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souNdguy

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Dave Wave

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souNdguy

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Dave Wave

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souNdguy

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