Squarebirds, Rocketbirds, and Fifties/Sixties Ford Discussion Forum

Squarebirds, Rocketbirds, and Fifties/Sixties Ford Discussion Forum (http://squarebirds.org/vbulletin/index.php)
-   1958 To 1960 Squarebirds - General Technical Discussion (http://squarebirds.org/vbulletin/forumdisplay.php?f=14)
-   -   Steering Control Valve Tech Tip (http://squarebirds.org/vbulletin/showthread.php?t=23008)

jopizz 07-10-2018 02:16 PM

Steering Control Valve Tech Tip
I was speaking with Dave Hodges ~ ayrwoof who gave me a tip regarding leaking power steering control valves. It appears that Ford was having the same issue back in the 50's and 60's. According to someone he spoke to who worked at an Edsel/Lincoln-Mercury dealership the fix was to soak the seals in DOT3 brake fluid for 15-20 minutes before installing and install them still wet. After putting the valve together fill with Type F transmission fluid. He says he did this quite a few years ago on his '60 and his valve is still leak free. He also indicated that he got new seals from The O-Ring Store LLC: https://www.theoringstore.com/ The part number for the larger seal is 6226-07-E70. He did not have the part number for the smaller seal but they list many different Ford seal kits so it's best to give them a call.


Tbird1044 07-10-2018 03:52 PM

This could be a great fix for a long time ongoing problem. I hope we get some feedback when some of the members try it. It should go in the TRL.

YellowRose 07-10-2018 05:03 PM

Steering Control Valve Tech Tip
I have just put this into the TRL in the Power Steering section. You will find it listed in the 2nd link down, •Squarebird Power Steering Rebuild & New Seals Kit. Clicking on that link will take you to the information below that Dave Hodges ~ arywoof provided John ~ jopizz with. I combined the two and modified the title slightly to indicate the seals were available also. Daro at The O-Ring Store (I will add them to the Advertisements Forum) told me that if someone can measure the smaller seal, Inside & Outside Diameter and send them a picture of it with those measurements, they may have that smaller seal also. You can email him at:


simplyconnected 07-10-2018 05:44 PM

Wait a minute...
Seals and fluids must be compatible. Normally, seals made for use with DOT-3 will bloat terribly when exposed to petroleum-based products. We also found that silicone-based fluids can bloat certain seals.

'O' rings come in different rubber compounds. Some are neoprene, Viton, Buna-N, etc.

Do NOT buy any 'O'-ring and slap it in your steering system without knowing EXACTLY what it is or another teardown will certainly be in your near future.

It is a mistake to point to the TRL before knowing specifics about compatibility with our steering systems. - Dave

jopizz 07-10-2018 06:14 PM

As I pointed out Dave Hodges had success with certain seals that I referenced in my post. Since his rebuild has lasted multiple years without failure I will assume that the seals he used and the procedure he used was successful. We can only go by our members successes and failures. Any criticism of that is baseless in my opinion.


Tbird1044 07-10-2018 06:24 PM

Good point Dave. I looked at theoringstore website and used the part number John listed and it showed it was made from EPDM. Then on the compatibility list, it shows it is recommended for brake fluid and not recommended for auto trans fluid. Hmm? The recommended for trans fluid was viton, Buna-N or kalrez. Of the 3, kalrez was the only one highly recommended for both fluids. Very expensive and may not be available in the sizes needed. I wonder what material Ford used on the original seals?
I think most of the commercial seal sealants in the cans at the auto stores are designed to chemically make the old seals swell. Guess this would be a long term test is someone tries it.

jopizz 07-10-2018 06:38 PM


Originally Posted by Tbird1044 (Post 116071)
Guess this would be a long term test is someone tries it.

The fact that Dave Hodges installed that seal many years ago and it hasn't leaked tells me that neither the brake fluid nor the Type F transmission fluid did it any harm. That's a lot longer than most people are getting out of new seals without soaking them beforehand. I know that from personal experience.


simplyconnected 07-11-2018 02:02 PM

1 Attachment(s)
John, with all due respect to you and Dave, I must defer to the experts who make 'O'-rings. Parker Hannifin has always been Ford's 'go-to' company. As Nyles pointed out, Parker has a handbook of compatibility because Parker makes 'O'-rings.

They show a listing for Type 'A; Transmission oil but I would call them for other types (like Type 'F'). Here's what they say:

jopizz 07-11-2018 02:08 PM

With all due respect something that has worked in a practical application for multiple years trumps any list you can provide. If I worked on cars solely based on what it says on paper and not by trial and error I wouldn't be much of a mechanic.


YellowRose 07-11-2018 08:24 PM

Steering Control Valve Tech Tip
Thanks to John ~ jopizz, we have been doing some research on these seals. John happens to have a few of them, one for the 1958 Spool small end and one for the 1958-1960 Spool large end with an EP45 number on it. That appears to be a Eaton Product Part #, according to Daro at The O-Ring Store. With the measurements and pix that John provided, Daro was able to tell me what their Part # was for those two additional seals. Here is that information.

The O-Ring Store Seal Part #'s

1958-1960 Thunderbird Power Steering Control Valve Seals - Used on 1958-1965 Tbirds (so I read).

1958 Spool small end - 5/8" ID x 7/8" OD - 1/8" C/S - HRU12-0.62-12 Buna-N - 0 In stock but they can get them.


1959-1960 Spool small end - 1/2" ID x 7/8" OD x 3/16" C/S - 6226-07-E70. An EPDM seal - 408 In stock


1958-1960 Spool large end - 11/16" ID x 7/8" OD 3/32" HT - Part # EP45 - HRU09-0.68-09 Buna-N
0 In stock, but they can get them.


Daro said that instead of soaking them in brake fluid or Type F, to Use a PTFE Based Lubricant - Part # 21030

Buna-N 6226-07 good for petroleum based uses


Today, I spoke with Parker regarding the O-Ring Handbook not listing Transmission fluid Type F. What he told me was that Type F was not satisfactory to use either. Here is the information he gave me on page 3-11 of the Handbook.

Parker O-Ring Handbook


For automatic transmission:
Medium: ATF oil (Automatic Transmission Fluid)
Compound: N0674-70, N0552-90, AA150-70,
AE152-70 (Vamac), V1164-75,
V0884-75 (brown)

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