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Power steering #: 2089

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Posted: Sun Apr 12th, 2020 09:11 pm

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HT08
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All, I have had a small leak coming from the large nut that sits against the plastic power steering pump reservoir which in turn holds the smaller nut where the high pressure line attaches. After a power steering flush and replenishing with Motorcraft Mercon V the small leak became more apparent and now I loose about 1/2 a pint every 2 days or so regardless whether I am driving or just sitting. I tried to get a seal or O-ring (not sure what goes in there) from the dealer but they said you have to buy the whole pump. I asked on another forum but was told even if I purchased a rebuild kit that one does not come with it.

The pump is quiet and besides the leak I don't have any complaints. Anyone encounter this issue before and has any suggestions besides replacing the pump? I don't want to keep pouring Mercon V in there (that stuff is not cheap).

Thanks for your time and Happy Holidays!

Last edited on Mon Apr 13th, 2020 06:26 am by HT08

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Posted: Mon Apr 13th, 2020 10:20 am

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that fitting is either sealed with an O ring or a mechanical flare
if it is an O ring you can for SURE buy another one, plenty of sources for O rings
If it is the flare that seals it up then it just needs to be removed and cleaned.

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Posted: Mon Apr 13th, 2020 12:47 pm

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Thanks for the tip! I was thinking of a Viton O-ring as that is suppose to work best with petroleum products and high temperatures, Mcmaster Carr maybe? Thoughts ??

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Posted: Mon Apr 13th, 2020 10:13 pm

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HT08 wrote:
Thanks for the tip! I was thinking of a Viton O-ring as that is suppose to work best with petroleum products and high temperatures, Mcmaster Carr maybe? Thoughts ??
Love Viton and I'm a Mcmaster user from back before they had a web page. Their web page is the absolute best in the industry, easy to find anything you need.

Viton will work, just make sure the surfaces aren't all pitted up. There are 3 different durometers also to choose from. Ugh LOL.

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Posted: Tue Apr 14th, 2020 11:00 am

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JAMMAN wrote:
HT08 wrote:

Thanks for the tip! I was thinking of a Viton O-ring as that is suppose to work best with petroleum products and high temperatures, Mcmaster Carr maybe? Thoughts ??
Love Viton and I'm a Mcmaster user from back before they had a web page. Their web page is the absolute best in the industry, easy to find anything you need.

Viton will work, just make sure the surfaces aren't all pitted up. There are 3 different durometers also to choose from. Ugh LOL.
Thanks that's reassuring but now you just added complexity to my search, LOL so which durometer should I look for or will it be obvious once I remove the large nut? Thanks for the reply, much appreciate the input :-)

Last edited on Tue Apr 14th, 2020 11:01 am by HT08

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Posted: Tue Apr 14th, 2020 03:26 pm

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Can't go wrong with 75A except for extremely low pressure applications.

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Posted: Tue Apr 14th, 2020 07:35 pm

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JAMMAN wrote:
Can't go wrong with 75A except for extremely low pressure applications.
This helps me a lot in my search once I take this thing apart. Really appreciate the information. Thank You!

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Posted: Thu May 14th, 2020 08:58 pm

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UPDATE! After removing the large nut that sits up against the power steering reservoir (this is where my leak was coming from) I realized it is under tension as it shot out as I was removing it, it is called the Flow Control Valve. I ordered from McMaster-carr the Viton O-ring(s) I say plural because there is another one that sits inside on the valve that I decided once I have it out I might as well replace it. Here are the sizes I used. For the inner and the smaller diameter O-ring I used Viton 75 Shore A 2.5X15 mm and for the outer larger diameter seal (the one that was seaping/leaking I used Viton 75 Shore A 2.5X19.5 mm. TIP: I ended up removing the driver's side inner fender well and I had a ton of room and access to do this job easier, in fact I had such a clear shot of the O2 sensor that I ended up replacing it as it was the original with 244K miles on it. After assembly and refilling the reservoir with Mercon V