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What size is the tubing/fitting going into a 56 Mopar Coaxial Steering Box?
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56D500boy
Posted 2022-03-21 8:43 PM (#620382)
Subject: What size is the tubing/fitting going into a 56 Mopar Coaxial Steering Box?



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I am lining up the ducks for a new, belt-driven (not generator driven) PS pump (a Ramcharger 4 x 4 style Saginaw pump) and will need to have a new hose made to mate the metric fitting on the pump
to the SAE fitting on the Coaxial steering box (see photo below).

I am hoping that my NOS parts guy might come through with a new (or used) OE 56 Dodge PS hose but so far no luck.

In lieu of that, any ideas what the fitting is at the coaxial box (probably a double flared tube but I don't know what the thread is going to be on the tubing nut).

The tubing nut seems to be 11/16" (ish). An 11/16" open end wrench fits over the nut but seems a bit loose. A 5/8" wrench will NOT fit on.

The tubing seems to be about 1/4" (17/64") O.D. if that helps.

Any ideas (confirmation?) ??

(I don't want to break this hose loose or cannabalize it - yet )



Edited by 56D500boy 2022-03-21 9:33 PM




(56DodgeCoaxialPSBoxInProcessOfBeingCleanedSlowlySlowly.jpg)



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Attachments 56DodgeCoaxialPSBoxInProcessOfBeingCleanedSlowlySlowly.jpg (132KB - 133 downloads)
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Powerflite
Posted 2022-03-21 9:22 PM (#620384 - in reply to #620382)
Subject: Re: What size is the tubing/fitting going into a 56 Mopar Coaxial Steering Box?



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I'm pretty sure it was a double flare fitting just like you make with brake lines. I am away from home until Saturday so I can't check my '56 Fury power box for you until then. Chrysler used similar connections on their later '60's radiator cooler lines.
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56D500boy
Posted 2022-03-21 11:27 PM (#620391 - in reply to #620384)
Subject: Re: What size is the tubing/fitting going into a 56 Mopar Coaxial Steering Box?



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Powerflite - 2022-03-21 6:22 PM
I'm pretty sure it was a double flare fitting just like you make with brake lines. I am away from home until Saturday so I can't check my '56 Fury power box for you until then.


That will be great.

Just tried a flare nut wrench on the fitting on the coaxial steering box. 11/16" goes on, but seems too loose (i.e. it will round off the points on the nut). In contrast, I can't get the 5/8" end of the flare nut wrench on the fitting. I will try again tomorrow. Has to be 5/8". (???)



Edited by 56D500boy 2022-03-21 11:30 PM
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56D500boy
Posted 2022-03-28 1:41 AM (#620526 - in reply to #620391)
Subject: Re: What size is the tubing/fitting going into a 56 Mopar Coaxial Steering Box?



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56D500boy - 2022-03-21 8:27 PM Just tried a flare nut wrench on the fitting on the coaxial steering box. 11/16" goes on, but seems too loose (i.e. it will round off the points on the nut). In contrast, I can't get the 5/8" end of the flare nut wrench on the fitting. I will try again tomorrow. Has to be 5/8". (???)


I tried again a couple of times. Same answer: 11/16 flare is loose and 5/8 seems impossible. I might try a crows foot (??)

Nathan found out that he didn't have the hose that he thought he had. (Thanks for trying Nathan).

Anybody? Sven?

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Powerflite
Posted 2022-03-28 3:40 AM (#620528 - in reply to #620382)
Subject: Re: What size is the tubing/fitting going into a 56 Mopar Coaxial Steering Box?



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My '57-'58 cars use a 5/8" wrench on the nut. I'm not sure what is causing it not to fit, but it may be that it is deformed a little. You could try a 16mm, which is a little bigger to see if that works. But it should take a 5/8" if it were in good shape.
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