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Old 04-09-2019, 02:49 PM   #1
Redbird
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Default Schrader tire gauge repair

Has anyone taken one of these gauges apart? I can unscrew the head and that is about it.
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Old 04-09-2019, 05:08 PM   #2
Mad Mac
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Default Re: Schrader tire gauge repair

Mine was frozen with rust so I left it in diesel for a couple of months. Finally managed to dismantle it, but don't have the spare parts to repair it.
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Old 04-09-2019, 09:07 PM   #3
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Default Re: Schrader tire gauge repair

What is inside?
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Old 04-09-2019, 10:03 PM   #4
BILL WILLIAMSON
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Default Re: Schrader tire gauge repair

Quote:
Originally Posted by Redbird View Post
What is inside?
A slide scale & a spring.
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Old 04-10-2019, 08:40 AM   #5
Dick So. Cal.
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Default Re: Schrader tire gauge repair

I just replaced the o-ring and mine works just fine.

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Old 04-10-2019, 04:49 PM   #6
Bob/AZ
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Default Re: Schrader tire gauge repair

Mine is like the upper one in Redbirds post. The sliding scale is free but it didn't work so I decided to try to replace the gasket material where it contacts the tire Schrader valve. I dug the old stuff out and it was more like a fiber material than rubber. I cleaned it up down to bare metal and there are two metal washers at the bottom. One of them is sort of a flat cup shaped washer which I assume the gasket sits in. I tried O-rings with no luck so I punched out a 1/8 inch thick rubber washer of a diameter which fills the area and I then punched a hole in the center which fits around the post. Now when I put it on a tire Schrader valve it only slightly moves the gage out. Has anybody rebuilt one of these?
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Old 04-10-2019, 06:43 PM   #7
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Default Re: Schrader tire gauge repair

Thanks for the info so far. After you unscrew the head there is a disc of some sort with a hole in the center. Anyone get that disc out w/o destroying it. I can give both a hard shake, like shaking down a thermometer, and the indicator comes out. I don't know what kind of spring, as Bill indicated, would be in there.
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Old 04-10-2019, 07:25 PM   #8
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Default Re: Schrader tire gauge repair

I just cut a slice mark on the disc and got it out, and a piece of a round gasket. down the center is a rubber liner of some sort that came apart from age. A camera shot down the middle still shows part of the liner. I think I can see a frozen/rusted up spring. I am going to soak in Evaporust over night and see what else I can take out.
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Old 04-10-2019, 10:36 PM   #9
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Default Re: Schrader tire gauge repair

I didn't want to mess with that disc since I didn't think I would be able to replace it but I'm thinking my problem might be under there also. A rebuild kit for these would be the answer but for a low dollar item I don't think that's gonna happen.
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Old 04-11-2019, 07:04 PM   #10
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Default Re: Schrader tire gauge repair

I got it apart! After soaking overnight, the order of disassembly is: unscrew the head, remove the disc with the hole in it (had to cut a slice in it w/ razor knife), with a large screwdriver back out the spring assembly, remove the "scale" cylinder. The spring was very rusty, so back into the EvapoRust.
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Old 04-11-2019, 08:52 PM   #11
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Default Re: Schrader tire gauge repair

Both ends attached to the spring unscrew. There is a thin rubber membrane capped at one end, and open toward the nozzle head. I used the end of a pencil to push it out. It was a little rotted and broke. The spring is back soaking since a few of the windings on the spring were rusted together.
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Old 04-11-2019, 09:47 PM   #12
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Default Re: Schrader tire gauge repair

Great pictures Redbird. Now I can see how the thing works. Do you have any ideas on what you might use to replace that membrane?
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Old 04-12-2019, 08:52 AM   #13
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Default Re: Schrader tire gauge repair

I got them both to work, by cutting out a disc from carb gasket material, and cut off a finger from a sterile medical glove to use as the membrane. Work very slowly while disassembling and reassembling.
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Old 04-12-2019, 09:48 AM   #14
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Default Re: Schrader tire gauge repair

Quote:
I got them both to work
How are they for accuracy?
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Old 04-12-2019, 11:29 AM   #15
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Default Re: Schrader tire gauge repair

So so on accuracy!
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