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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Power Steering Hose Fitting Size ???

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Old Sep 6, 2017 | 11:15 PM
  #1  
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Power Steering Hose Fitting Size ???

Regarding a 1985 F-350 power steering Pressure hose:

I need to know the thread size and proper fitting style/name of the flare fitting that screws into the steering gearbox; is it a standard size; is it SAE or Metric; is it something weird?

Better yet, I need a 06 JIC male adapter that will fit that hole.

Thanks for reading and all help is appreciated.
 
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Old Sep 7, 2017 | 07:56 AM
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If you want to cut your own power steering pressure hose you can get power steering fittings from Summit or Jegs:


https://www.summitracing.com/search/...ibanner=SREPD4


I believe you will need a 3/8" o-ring type fitting for your power steering gear box.
 
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Old Sep 7, 2017 | 08:29 AM
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Originally Posted by Olds64
If you want to cut your own power steering pressure hose you can get power steering fittings from Summit or Jegs:


https://www.summitracing.com/search/...ibanner=SREPD4


I believe you will need a 3/8" o-ring type fitting for your power steering gear box.
Thanks.
Will this O-ring seal be underneath the threads and seal inside the gearbox, or will it be above/around the threads and seal against the flat outer surface?

Your link led me to find these fittings as well that will allow me to make the hose myself:
https://www.summitracing.com/parts/fra-259006/overview/
 
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Old Sep 7, 2017 | 12:20 PM
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The way most of that type of fitting w/ring works is the end of the hose, metal part, is extended some and the ring fits over that part.
When the hose is installed the metal part fits inside it and the ring sits on top. When you tighten the fitting down the fitting pushes on the metal part of the hose pinching the ring between the metal hose and the seat of what ever it fits into.
Dave - - - -
 
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Old Sep 7, 2017 | 12:47 PM
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From: Edmond, OK
If you need a 3/8" O-ring fitting use one of these:


https://www.summitracing.com/search/...4&N=4294835063


The fitting you provided a link to is a 90* 6-AN fitting. It won't work with your power steering gear box.


You can also eliminate the need for a fitting by fabricating a hose barb from your old power steering pressure hose. It would look like this:


https://www.summitracing.com/parts/edd-39135/overview/


Just replace the o-ring on the fitting and rent a tubing flaring kit from the auto parts store.
 
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Old Sep 7, 2017 | 01:00 PM
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Thanks for all the helpful links.

Originally Posted by Olds64
The fitting you provided a link to is a 90* 6-AN fitting. It won't work with your power steering gear box.
My intentions are to install JIC adapters in the gearbox and pump.

You can also eliminate the need for a fitting by fabricating a hose barb from your old power steering pressure hose.
Will that style work on the pressure hose ?
 
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Old Sep 7, 2017 | 02:16 PM
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1978 and later F100/350 & Bronco use the Ford C-II P/S pump that has a plastic reservoir.

The P/S pressure hose has a straight tube with an O-Ring on the pump end, connects to the pump w/a qwik connect fitting.

There are TWO possible O-Rings and qwik connect fittings:

388748-S .. 1/4" O-Ring - Use with 5/16" qwik connect fitting.

388749-S .. 5/16" O-Ring - Use with 3/8" qwik connect fitting.
 
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Old Sep 7, 2017 | 02:30 PM
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Originally Posted by LongRider
My intentions are to install JIC adapters in the gearbox and pump.

Oh, ok.


JIC or AN hoses should work just fine for a power steering pressure hose. To eliminate the need for a hose clamp and barb off of the power steering gear just use the adapters like you planned.
 
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Old Sep 7, 2017 | 04:27 PM
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I found it!!!

https://www.summitracing.com/parts/rus-640330/overview/

Fitting is 5/16 inverted flare.
Thread size is 1/2 x 20.

This should screw straight into my steering gearbox.
 
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Old Sep 7, 2017 | 06:48 PM
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I got to ask what is wrong with getting a stock replacement for the auto parts store?
Dave ----
 
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Old Sep 7, 2017 | 08:17 PM
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Originally Posted by FuzzFace2
I got to ask what is wrong with getting a stock replacement for the auto parts store?
Dave ----
You have a legitimate question and it would be nice if things could be that easy.

Reason #1 is superior hose, superior fittings, and much easier installation with JIC

Reason #2 is I have not as yet been able to find a stock replacement for a 1985 F-350 with 6BT Cummins engine.
 
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Old Sep 8, 2017 | 07:52 AM
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Let us know what's up. We look forward to seeing pics once it's installed.
 
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Old Sep 8, 2017 | 07:05 PM
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Originally Posted by FuzzFace2
I got to ask what is wrong with getting a stock replacement for the auto parts store?
Dave ----
He is using the original power steering pump on the cummins engine. Not sure if it's a Chrysler pump or what.
 
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Old Sep 8, 2017 | 07:15 PM
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Originally Posted by Franklin2
He is using the original power steering pump on the cummins engine. Not sure if it's a Chrysler pump or what.
The Cummins P/S pump is a Cummins part and is gear-driven off the firewall side of the timing gears.
A double-piston vacuum pump is directly attached to the timing gear cover and the P/S pump is attached to the vacuum pump; all way down low on the driver's side, just inches from the steering gear.

Back in 2006, I took the Cummins pump fitting and the Ford steering-gear fitting to the local hose shop and the guy took the two and made one.
Alas, all I can get now is that blank deer-in-the-headlights look and no ambitious help.

This is all probably to my benefit, as this braided stainless JIC set-up is going to be much better and way easier to install; no more fighting fine threads on stiff hoses in tight confines; JIC is wonderful ! ! !
 
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Old Feb 9, 2022 | 07:57 PM
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Bringing this back from the dead. Just throwing in a chart with power steering hose sizes. The two ends highlighted in red and green were what matched up for my 1999 hydroboost with 2008 steering box.
 
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