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I'm still trying to get my SWM Blueback seaworthy.......I need an O-ring for the ballast intake. The old ones were shot. Any suggestions? It appears there were two in there originally. Is there such an animal as a double O-ring???? The diameter is 5/16".
If you have the old o-ring you should be able to match it.
Measure the shaft so you know exactly it's size.
Measure the part that restrains the outside of the o-ring.
Write these numbers down and take with you to the hardware store.
Hesperia...You can check at Lowes, Home Deport, OSH, True Value Hardware, and most auto parts stores.
They have little draws with various sizes.
New o-ring and a little silicone grease and you should be set.
No silicone grease, you can use Vaseline.
Place grease or Vaseline between thumb and first finger and draw o-ring through until you have a coating on the o-ring.
You can also put a little in the fitting you put the o-ring in but very little as this sounds like a non moving part.
If no one has what you want then a place like the O-ring Store would be a place to order what ever you want.
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Notice...SubRon7 Sept 10th, Yorba Linda Park. early
Hardware stores have small draws with small parts in them.
These parts are usually not packaged and are loose in draws.
Specialty bolts, screws, washers, nylon bolts, brass fittings and such, including o-rings.
There is also www.theoringstore.com which has every ID/OD/ material combination that you can think of. Buy 100, and throw away 98, and it's still cheap.
Vulcanizing requires expensive equipment and is not really for the one or two o-ring repairs.
Gluing can be done with a special super glue and then there is the two part bonders.
Rod Miller of Momar's Handyman Division demonstrates Q-Bond, the fastest bonding, strongest adhesive available today!Q-BOND is one of the finest products for...
It is much cheaper to buy the correct size or even a couple above and below the size you need.
What size are you looking for?
I am not sure I have o-rings with a 5/16" inside diameter.
I use cup seal for 5/16". Mostly drive shafts.
Don't waste your time making o-rings from cord- it's much better and simpler to buy them moulded in one piece.
Plenty of suppliers online if you have trouble sourcing them locally. Correct sizing of o-rings is not difficult, so not much excuse for fitting the wrong size. Use a pair of calipers and take some measurements of the cylinder internal diamater and the endcap o-ring slot. O-rings are specified by internal diameter, then you add twice the o-rings cross sectional thickness to get the external diameter. o-rings should fit in the groove with a bit of 'snap'. 1-5% of the o-rings diameter is acceptable with optimum being about 2%.
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