Power steering leak - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 29 (permalink) Old 05-22-2017, 01:15 AM Thread Starter
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Power steering leak

Had a power steering leak get progressively worse over the last 4-5 months or so. Finally after sitting for a few days, i noticed today there was about a 1 foot wide circle in my driveway.

Started to do some research and came across some information that Ford says to use ATF, Mercon V to be exact, and not powersteering fluid (funny how you can use power steering fluid in a POWER STEERING SYSTEM). Anyways, I've been running power steering fluid for a couple years now. Could it have torn up a seal and be leaking now? Where would it normally start to leak as I can pinpoint where its coming from.

Today I did a flush with STP Mercon V that i got from AutoZone. I just sucked out as much as i could out of the reservoir, refill with ATF, then start the truck and turn the wheel left and right for a few minutes. Then repeat the process until i went through 2 quarts of ATF. Stuff that came out was pretty dark, and whats in the reservoir now is pretty bright Red, so I'd like to think i got atleast most of it. The last fill I added in Lucas Power Steering Stop Leak to see if that would help any. We'll see.

Any ideas where the leak could be coming from? I've finally fixed every oil, transmission, and fuel leak on the truck, now its just this last one!


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #2 of 29 (permalink) Old 05-22-2017, 03:39 AM
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Re: Power steering leak

Hoses are the most likely culprit, but it could literally be leaking from anywhere. The PS fluid causing a leak is kind of dubious, it'll just break down faster or foam more or do whatever it is that its not supposed to do. Youd need a tribiologist to answer that one.

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post #3 of 29 (permalink) Old 05-22-2017, 04:33 AM Thread Starter
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Re: Power steering leak

Hmm, well looking online both PS lines aren't that expensive, maybe its time to just replace them and hope its not the box leaking?


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #4 of 29 (permalink) Old 05-22-2017, 04:34 AM
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Re: Power steering leak

It could also be the pump its self leaking as it has a plastic body sealed to pump with orings.


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post #5 of 29 (permalink) Old 05-22-2017, 04:47 AM Thread Starter
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Re: Power steering leak

Seem I cant buy just that o-ring on RockAuto either. But i could get the entire reservoir with the O-rings for $15. Good info. Also the entire power steering pump, with reservoir is only $50 or so. Just need to reuse my stock pulley.

Hmm, I wonder if I pulled the pump out, if it will be obvious of where its leaking. Right now its just hard to see in there, especially with my bad eyes.


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #6 of 29 (permalink) Old 05-22-2017, 04:56 AM Thread Starter
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Re: Power steering leak

Anyone know if the pumps on these trucks have "Metric Threads" Or "Standard Threads"? While looking at them on Rock Auto, it seems to have 2 options and I'd hate to get the wrong one, if I did end up buying one.


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #7 of 29 (permalink) Old 05-22-2017, 05:07 AM
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Re: Power steering leak

Mine was metric but I ran into same problem luck the pressure hose had been replaced at one point so we used that to figure mine out.


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post #8 of 29 (permalink) Old 05-22-2017, 05:29 AM Thread Starter
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Re: Power steering leak

So im guessing the metric thread is for the high pressure line that goes into the side of the pump? If thats the case, If i end up having to order the pump, ill order the pressure line with the same threads to match the pump, its only $16 for the line.


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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post #9 of 29 (permalink) Old 05-22-2017, 06:17 AM
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Re: Power steering leak

Do you have vacuum or hydroboost brakes? That's what seems to be the difference.
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post #10 of 29 (permalink) Old 05-22-2017, 06:57 AM Thread Starter
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Re: Power steering leak

Vacuum. Wish I had hydroboost lol


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1996 Cali F350 CCFB, 7.3 PSD, 2wd SAS, w/ 380,000 miles.
New Motor at 352,000, DieselSite Legendary Trans at 356,000 and many more
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