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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 09-03-2006, 01:36 PM   #1 (permalink)
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Power Steering Fluid

How often do you have to change the powersteering fluid (bought it used at 120000 miles, don't know if its ever been changed). And how do you do this? Can you use tranny fluid?


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Old 09-03-2006, 01:40 PM   #2 (permalink)
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Re: Power Steering Fluid

I change mine at about 25k and start adding Mobil one AFT. I do a non typical change and only change the fluid in the reservoir. Every 3k-5k it gets another shot of Mobil 1. Never had a problem with the pump or steering gear doing this. There are write ups on a complete change by removing the return line from the pump but I've never done that.
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Old 09-03-2006, 01:44 PM   #3 (permalink)
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Re: Power Steering Fluid

When in doubt change it. I went with redline synthetic high temp atf.
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Old 09-03-2006, 04:03 PM   #4 (permalink)
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Re: Power Steering Fluid

[ QUOTE ]
How often do you have to change the powersteering fluid ...

[/ QUOTE ]

Ford doesn't mention changing it, but I do mine about every two or three years, or around 50,000 mile intervals.


[ QUOTE ]
And how do you do this? Can you use tranny fluid?


[/ QUOTE ]

There are several ways to skin a cat. Here's my way.

Buy at least two quarts of MERCON ATF. Or if you want to do an outstanding flushing job, then buy 3 quarts. I spend a bit extra and buy Mobil 1 synthetic MERCON ATF

Yes, that's tranny fluid. Do not buy ordinary power steering fluid, because Ford requires MERCON ATF.

Raise the hood and notice the brake master cylinder near the driver's side of the firewall. In front of the master cylinder is the brake hydroboost unit (power brake booster). There are two lines that run from the power steering pump to that hydroboost unit. One line is out near the fender where it would be easy to get to, but that's not the one you want. You want the one fartherest away from you - the one that's harder to reach.

Disconnect that hard-to-reach line at the hydroboost unit. Pay attention and don't lose the nylon/plastic "O" ring on the end of that line.

Aim that disconnected line at a container.

Remove the cap from the power steering pump reservoir. Have your sweetheart help by starting and killing the engine when you holler. Place yourself so you can see into the powering steering reservoir and aim the line at the used-oil container at the same time.

Do this: Holler to start the engine. Watch the reservoir, and when it's empty, then holler to stop the engine. Fill up the reservoir with new ATF.

Repeat the "do this" above several times, until you have poured in at least two quarts of new ATF. If you want a really good job of flushing, then continue until you have poured in 3 quarts of new ATF.

Button it up and you're good to go.

Don't worry if you inadvertently pump the reservoir dry and get some air into the system. The air will soon work it's way out of the system with no ill effects.
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Old 09-03-2006, 04:08 PM   #5 (permalink)
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Re: Power Steering Fluid

you guys sure work hard.

buy a quart of synthetic atf.

park over a dusty gravel area.
put oil pan under reservoir.
put funnel into powersteering filler.
start truck.

pour synthetic atf into powersteering letting it overflow into oil pan and doing your part for the EPA by reducing dust.
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Old 09-03-2006, 04:19 PM   #6 (permalink)
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Re: Power Steering Fluid

[ QUOTE ]
you guys sure work hard.

buy a quart of synthetic atf.

park over a dusty gravel area.
put oil pan under reservoir.
put funnel into powersteering filler.
start truck.

pour synthetic atf into powersteering letting it overflow into oil pan and doing your part for the EPA by reducing dust.

[/ QUOTE ]

And it will be mostly NEW ATF that overflow's into the pan on the ground...

A method that works and will actually get the new ATF in your system is to pull the return line that comes from the brake booster to the reservoir, and have it discharge into a bucket. Have a helper do a combination of pulsing the brake pedal and turning the steering wheel while you stand there and add ATF to the reservoir as the level drops.

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Old 09-03-2006, 05:51 PM   #7 (permalink)
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Re: Power Steering Fluid

Thanks, I'll try that this weekend. Hopefully that will cut down on the "whine" from the power steering. It seems like you guys know just about everything about these trucks.


Thank you!
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Old 09-03-2006, 11:02 PM   #8 (permalink)
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Re: Power Steering Fluid

[ QUOTE ]


And it will be mostly NEW ATF that overflow's into the pan on the ground...


Hammer

[/ QUOTE ]

wanna bet?????? Have you tried it????? The truth is that there is really not that much fluid in the system, and the fluid is used over adn over at a VERY high rate. So, you basically can't pour it in NEARLY as fast as teh fluid cycles.

Further, you can't drain a significant portion of the fluid out of it no matter what you do.

The funnel ensures you get down near the intake for the pump.
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Old 09-04-2006, 12:11 AM   #9 (permalink)
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Re: Power Steering Fluid


"Do not buy ordinary power steering fluid, because Ford requires MERCON ATF."

what happens if you do use regular power steering fluid? is it damaging? or is it because mercon atf is just better suited?
[img]/ubbthreads/images/graemlins/shrug.gif[/img]

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Old 09-04-2006, 12:20 AM   #10 (permalink)
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Re: Power Steering Fluid

[ QUOTE ]

"Do not buy ordinary power steering fluid, because Ford requires MERCON ATF."

what happens if you do use regular power steering fluid? is it damaging? or is it because mercon atf is just better suited?
[img]/ubbthreads/images/graemlins/shrug.gif[/img]

darren

[/ QUOTE ]

typically, power steering fluid and ATF can be compatible together in power steering systems. Even so, ATF actually tends to be superior since it contains more EP &amp; AW additives than conventional PS fluid. In some cases, seal and component compatibility with the type of fluid used comes into play. It is generally considered best to use what the Manufacturer says to use.

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Old 12-22-2006, 10:38 AM   #11 (permalink)
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Re: Power Steering Fluid

Synthetic Mercon ATF would probably be the best.Ford recommends Mercon ATF.Regular power steering will work but like Hammer said ATF has more additives and IS what is recommended.50k mile intervals should be good unless you off road or have real big tires or both.I change mine by removing the line to the power steering cooler and pump it into a DRAIN PAN(drmiller100) [img]/ubbthreads/images/graemlins/vomit.gif[/img] about 2 qts. [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 12-22-2006, 10:44 AM   #12 (permalink)
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Re: Power Steering Fluid

I have never have changed my power steering fluid.I guess this is on my to do list.

mike
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Old 01-01-2007, 10:30 PM   #13 (permalink)
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Re: Power Steering Fluid

I need to do this too.
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Old 04-11-2007, 08:17 PM   #14 (permalink)
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Re: Power Steering Fluid

Buy a Turkey- baster and every time you change your oil, suck out a little power steering fluid and replace it with Synthetic Mercon ATF Spike481
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