Vance, Brett,
Sorry to disagree with you Vance but any old o-ring sold in the hardware
store is most likely NOT made out of Ethylene Propylene (EP). EP is
approved for contact with brake fluid. Never use butyl o-rings for an
application that mixes with brake fluid. They will disintegrate.
Below is a post I made to the Triumphs list back in 1999. I see
American Packing and Gasket still has a web site.
The size I listed fit my '75. Since my initial search and purchase in
'99, I've come to learn that there are seems to be an alternate size of
oring used by Triumph. Check your size then look on their website.
They now call their material EPR. EPR 70 is what you want.
Good Luck,
Gary
'75 TR6
-------------------------
Last Fall, I purchased a quantity of O-Rings and offered them to list
members but unfortunately, they're all gone. I still get requests from
time to time so I suspect that like me, you can get rid of them in short
order by offering them to fellow list members, too. They're not
expensive, less than $.50 each if I remember. You can order a quantity
($5 minimum plus about $7 postage) from:
American Packing and Gasket Co.
1-800-888-5223
www.apandg.com
The proper part number is E70010
description: 568-010 EPR 70 O-Rings
I've included my earlier post where I indicated the specs for the O-Rings.
Good Luck,
Gary
Severn, MD Digest
'75 TR6
----------
Gary Klein wrote:
>
> Fellow Scions,
>
> The specs on these rings are:
>
> Cross-Section (width) of 0.070" +or- 0.003" and an Inner Diameter range
> from Minimum of .234", Mean of 0.239" and a Maximum of 0.244. These
> O-Rings differ than those indicated in the VTR website article. I have
> a later model PDWA which is a bit different as it does not have the
> circlips as shown there.
-------------
>Date: Sun, 21 Sep 2008 12:43:11 -0700
>From: "Navarrette, Vance" <vance.navarrette@intel.com>
>Subject: Re: [6pack] pdwa
>To: Brent <bregal@wi.rr.com>, "6pack@autox.team.net"
> <6pack@autox.team.net>
>
> Brent:
>
> Yank it out and go to the hardware store. The orings are a standard
>size, but I could not tell you what the size is off hand.
> Be aware that some PDWAs use the cup seals, and they are not
>rebuildable to the best of my knowledge. But the later ones, including the 74
>are rebuildable. Caution: the orings need to be sized for a FIRM resistance to
>movement on the piston. It is possible to get the orings sized down by one
>size, and the piston will be a light press fit. This is too loose and will
>eventually leak. When lubed with fluid, a firm pressure should be required to
>move the piston. If in doubt, get both sizes of orings and try them at home.
>They are very cheap and throwing away one set will cost you about $1.50. Use
>the original orings as a guide, but realize that they can become deformed over
>time and so may appear a tiny bit smaller than what you really need.
>
> Vance
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