O-Rings
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Tourer
Joined: Apr 2011
Posts: 377
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From: Pittsburgh
O-Rings
What is the proper O-Ring size for the oil, tranny and primary? I would like to buy a few and keep them around. It is hard for me to get to the dealership, local hdware store should have them. They are not anything special are they?
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
yes, they are a petroleum resistant viton.
just get a bunch at the dealer next time, yes they cost more but you can be sure that the rubber won't degrade.
when tightening the plug, don't go over tight, i get many uses- but I replace if flat-spotted or visible tears, damage.
Mike
just get a bunch at the dealer next time, yes they cost more but you can be sure that the rubber won't degrade.
when tightening the plug, don't go over tight, i get many uses- but I replace if flat-spotted or visible tears, damage.
Mike
Last edited by mkguitar; Apr 27, 2012 at 07:48 PM.
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
I thought O rings must be available in a few standard sizes and be widely available. But I learned years ago, trying to find the right size, that it was easier and cheaper in the long run to get the correct ones. Now it may indeed be that those you want are stocked more conveniently and I look forward to other replies! Fingers crossed.....
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
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From: earth
Industry size 013, go with the Viton, they are good to 400 degrees, Buna-N is only good to 250. $7.72 per 100 at McMaster Carr.
http://www.mcmaster.com/#rubber-o-rings/=hah9a2
http://www.mcmaster.com/#rubber-o-rings/=hah9a2
Tourer
Joined: Jun 2011
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From: Watauga, TX
Road Warrior
Joined: Jun 2009
Posts: 1,943
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From: NYC
when my 07 was stock...it had no o-rings...used to turn the plugs in by hand then once they felt tight....turned them 1/16th of a turn more...never had leaks or seeps. Later I ordered some upgraded magnetic plugs...they came with o-rings...I installe the same way...soon as they feel tight by hand..1/16th of a turn more. Been reading the warnings about the sump plug....supposedly...too tight on that one will crack the hole....never seen it happen or heard of anyone who cracked their hole...but you never know.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,211
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From: Honah Lee
Soft rubber buna n. Probably best to change ever time but I scope it good and if it looks good, I have used them many times more then once. However if I get a drip, I replace it next time. Would never use one twice when I work on others. $1.00 cheap insurance....
Last edited by Jackie Paper; Sep 14, 2018 at 11:24 AM.
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Outstanding HDF Member
Joined: Jan 2010
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From: earth
when my 07 was stock...it had no o-rings...used to turn the plugs in by hand then once they felt tight....turned them 1/16th of a turn more...never had leaks or seeps. Later I ordered some upgraded magnetic plugs...they came with o-rings...I installe the same way...soon as they feel tight by hand..1/16th of a turn more. Been reading the warnings about the sump plug....supposedly...too tight on that one will crack the hole....never seen it happen or heard of anyone who cracked their hole...but you never know.
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
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From: earth
Great pic, that also shows a cross section view of the very narrow tapered land that the oring seals on in the pan, which is why a helicoil can not be used to repair a stripped drain plug, because that sealing land would be completely removed with the ovesized helicoil tap(sorry, little off topic)