Any way to expand an O-ring in a Bontrager pump?
05-12-22, 06:04 AM
#26
SE Wis
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Btw, the reason I think the original O-ring got worn down in the first place is some corrosion developed at the bottom of the tube. Not sure how that happened but I began to feel this rough spot at the bottom of the plunger travel. Before putting the new O-ring in I attached varying grades of wet-dry sandpaper to the end of a dowel with doubled over duct tape and worked it against the rough area until it disappeared. 320, 800, 2000, 3000 grit. Wiped it out with paper towels also attached to the end of the dowel and shot aerosol parts cleaner down there until the towels came out with no more residue, then re-lubed with Sil-Glyde.
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05-12-22, 06:04 AM
#27
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Btw, the reason I think the original O-ring got worn down in the first place is some corrosion developed at the bottom of the tube. Not sure how that happened but I began to feel this rough spot at the bottom of the plunger travel. Before putting the new O-ring in I attached varying grades of wet-dry sandpaper to the end of a dowel with doubled over duct tape and worked it against the rough area until it disappeared. 320, 800, 2000, 3000 grit. Wiped it out with paper towels also attached to the end of the dowel and shot aerosol parts cleaner down there until the towels came out with no more residue, then re-lubed with Sil-Glyde.
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05-16-22, 07:12 AM
#28
Keefusb
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Grainger would likely be your best bet for O-ring selection. I have used a few drops of "Trans-medic" automatic transmission treatment to induce slight swelling and lubrication of O-ring and other rubber seals if the OP was looking for a short-term fix until he can get another new seal.
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