Biopowered - vegetable oil and biodiesel forum
Biodiesel => Biodiesel equipment => Topic started by: neisel on December 10, 2018, 11:29:00 AM
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Anyone got a spare they don't need or know where I can buy one? Changing my filter this weekend & my O ring seems to have stretched to the point it won't form any kind of an effective seal.
Quite how it would have stretched so far baffles me & makes me wonder if I'm missing something here.
TIA.
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Do you know the O ring dimensions … I may have one that'll fit.
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Julian,
Any help? It's stretched so far I can't get a meaningful measurement. It actually seems to have shrunk back a bit, I think it was slacker a couple of days ago.
Maybe the one with the ruler in tells you what you need to know. looks like about 142mm to me
(http://i67.tinypic.com/2s00hdy.jpg)
(http://i63.tinypic.com/hreg5t.jpg)
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I can probably measure mine with a vernier if I remember this evening.
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That would help Tony.
I'd guess there's a bit of leeway in the OD, it's the cross sectional diameter that'll be more critical.
If you can't find one the right size, with care you can cut a section out of the old one and super glue it back together ... done this many times to resize O rings.
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Mine might be different - it has two o-rings:
(https://i.postimg.cc/029dr8p9/IMAG0451-1.jpg)
Both have a resting ID of ~80mm. The top one has a cross section between 3.25-3.30mm and the bottom one 3.10-3.20mm.
The channels they rest in have different diameters that I can't get the caliper into, approx 86mm. The rings are stretched to fit these, and the bottom channel has a slightly larger diameter than the top one.
If I was to speculate, I would guess that since the housing is imperial (10") that the o-rings are as well, perhaps 3 1/8" ID and 1/8" cross section.
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As best as I can measure them, the biggest O rings I have are 110 x 5, 100 x 5 and 84 x 3.5.
I have my doubts that the 110mm dia will stretch to 142mm, but if you're passing, bring the housing and we can give it a try.
If you know the correct size, O rings are readily available in a massive range of sizes, but at the size you want they look to get stupidly expensive … http://www.bearingshopuk.co.uk/orings-seals-clips/o-rings/?oring_int=22068
I'd try the cut and glue trick if it's just stretched … you've got nothing to loose.
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Just found this if it's any help ...
https://www.fountain-filters.co.uk/Filter+Housing+O+Ring/0_CAAA010/PRAA069.htm
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Thanks everyone.
I didn't know you could cut & glue O rings. I'll try that first.
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Make sure it's scrupulously clean.
Wash the O ring and blade in IPA or similar before cutting then leave the cuts as cut. Line up carefully and hold together for way longer than you think may be necessary … good luck.
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Can't beat random liquids spraying everywhere!
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Shhh … don't tell him!