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Leaky wheel O-ring.
- Thread starter sreng
- Start date
I have used 3/8 x 20 for a2 wheels successfully. However, the 20 dimension is the problem. They really need to be 3/8 x 19.5. The 20 inch are commonly available. If they are too long, they push out of the way instead of rolling into position between the wheel halfs. I have been cutting and superglueing to make them work. You could order custom made rings but all I could find were glued, not vulcanized. So I glue my own. I have disassembled several government-serviced wheels that had the o-ring pushed out. They held air for many years until they didn’t. I think that if I had found 5/16 x 20 rings, they would still be similarly problematic because the groove where the ring seats is less than 20 inch diameter.
I have used 3/8 x 20 for a2 wheels successfully. However, the 20 dimension is the problem. They really need to be 3/8 x 19.5. The 20 inch are commonly available. If they are too long, they push out of the way instead of rolling into position between the wheel halfs. I have been cutting and superglueing to make them work. You could order custom made rings but all I could find were glued, not vulcanized. So I glue my own. I have disassembled several government-serviced wheels that had the o-ring pushed out. They held air for many years until they didn’t. I think that if I had found 5/16 x 20 rings, they would still be similarly problematic because the groove where the ring seats is less than 20 inch diameter.
Gluing custom size o-rings is common in industrial settings. In fact, the “rubber rope” for our cargo covers is really bulk o-ring material. Use fresh, good quality superglue.
Gluing custom size o-rings is common in industrial settings. In fact, the “rubber rope” for our cargo covers is really bulk o-ring material. Use fresh, good quality superglue.
DREAD KT
Member
- 26
- 28
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- Location
- Yancey, TX
I just did some recent work on my 109A4 and never had any issues. Also, was able to get the right O-rings (think they are 5/16). Did not have issues finding them, but like any parts, I always buy more than I need. I always keep like 6 spares on hand. In fact, I always keep lots of spare everything on hand. It seems like everything is harder to find or is it just my imagination...or the de-globalization, etc. causing this.
charlesmann
Well-known member
- 700
- 713
- 93
- Location
- Temple, Tx
I too was having issues with finding 3/8 orings, and even new orings were as said, pushing out, causing the halves not to seal. My last attempt, i used 3M weather strip caulk (3/16” tar strips) and laid in enough strips to hold the oring in place and encircled the hole for the inflation stem. For a wheel assy to go from not holding air for 5 min, to holding with a 0psi drop in over a month, im happy with it.
Which size studs do you have? 3/4 or 5/8?
Valor
Active member
- 196
- 216
- 43
- Location
- Apple Valley, Ca.
I have recently been doing work on tires on my 923A2 and using the Gemplers OR220TG o-rings and they work good.