The Ford Barn

Walt Ebie · 10-05-2016, 06:29 PM

Recently installed a new gas valve so I thought I'd disassemble the old one to see if it could be redeemed as a spare. But the disassembly led to a question. In the picture you see all the parts of the valve and nowhere was there any shred of anything you could call 'packing.' All the repair kits I see include a packing cylinder so was there supposed to be some in this valve? It was put in when the car was restored about 1980-83 so were there valves that didn't use packing back then? The valve never leaked a drop - just got really hard to open and close. I hope a little valve grinding compound (or whatever you all use) and I can hand-lap the valve back into service. But what about the packing?

4port · 10-05-2016, 07:22 PM

Looks like a repop valve to me. That looks like a black "o" ring on the stem, hard to see in the picture. The rubber "o" ring acts as the seal on the stem, and takes the place of the packing. Lapping the taper to the seat can be done with toothpaste. If it is not scored, and does not leak it probably does not need to be lapped, just lubricated. Put some oil on it, work it back and forth, and reassemble.

MikeK · 10-06-2016, 07:20 AM

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You also need to replace the O ring. Make sure you get one rated for E10 fuel service.
Old O rings develop flats on their contact surfaces causing problems if re-used.
when O rings are used as a sliding seal, like your valve stem, they also require a compatible lube and polished contact surfaces.

10-05-2016, 07:22 PM	#2
4port Senior Member Join Date: May 2010 Location: Dallas TX Posts: 112	Re: Gas Valve Question Looks like a repop valve to me. That looks like a black "o" ring on the stem, hard to see in the picture. The rubber "o" ring acts as the seal on the stem, and takes the place of the packing. Lapping the taper to the seat can be done with toothpaste. If it is not scored, and does not leak it probably does not need to be lapped, just lubricated. Put some oil on it, work it back and forth, and reassemble. __________________ Remember when flying low inverted, down is up, and up can be expensive.

10-06-2016, 07:20 AM	#3
MikeK Senior Member Join Date: May 2010 Location: Windy City Posts: 2,919	Re: Gas Valve Question Sponsored Links (Register now to hide all advertisements) You also need to replace the O ring. Make sure you get one rated for E10 fuel service. Old O rings develop flats on their contact surfaces causing problems if re-used. when O rings are used as a sliding seal, like your valve stem, they also require a compatible lube and polished contact surfaces.