power steering shaft seal leaking... now what? - Diesel Forum - TheDieselStop.com
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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 12-16-2010, 10:38 PM   #1 (permalink)
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power steering shaft seal leaking... now what?

I've got a power steering fluid leak at the bottom of the steering shaft where it goes into the steering box... at the seal. What can I do to fix this? Does the steering box need to come off and be rebuilt? Or can just the seal be replaced while it's still on the truck. The steering box is mechanically good, seems a lot of work to remove/rebuild it just to fix a leaking seal...

Advice appreciated. thanks
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Old 12-16-2010, 10:59 PM   #2 (permalink)
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I would also like info on this. Mine started leaking about a month ago. I really done feel like pulling the whole thing to fix it. Also mine is leaking at the bottom where the pitman arm hooks up.
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Old 12-16-2010, 11:13 PM   #3 (permalink)
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The box has to come off and be partially disassembled to replace the bottom shaft seal. Definitely not a fun job, I did it last winter on my van. The van leaked so bad that it would blow through a quart in 5 miles. I seem to recall I got the seal at Azone or Napa.
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Old 12-16-2010, 11:31 PM   #4 (permalink)
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uggg... exactly what I didn't want to hear

I'm driving the truck 800 miles at xmas... hoping the leak doesn't get really bad bc I can't fix it before I go if it has to come off to be done. Right now it's dripping but just a little stain on the driveway after driving it... altho I guess you never know how long it'll take to get real bad

crap.
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'91 F-250 7.3idi XLT Lariat Supercab
Non-Turbo, Bone Stock
E4OD 4x2 4.10 non-posi
6 digit odometer
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still Minty Fresh

Sold my old 90 reg cab @340,000 miles (550,000km)
Still running I'm sure...
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Old 12-17-2010, 06:11 AM   #5 (permalink)
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The lower (sector shaft) seal can be replaced without removing the steering gear. Upper seal, the gearbox has to be removed.
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Old 12-17-2010, 07:29 PM   #6 (permalink)
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is the lower one the one that the steering wheel shaft goes into? Because that's where it's leaking....
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'91 F-250 7.3idi XLT Lariat Supercab
Non-Turbo, Bone Stock
E4OD 4x2 4.10 non-posi
6 digit odometer
122,000 miles (197,000km)
still Minty Fresh

Sold my old 90 reg cab @340,000 miles (550,000km)
Still running I'm sure...
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Old 12-18-2010, 07:55 AM   #7 (permalink)
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Quote:
Originally Posted by lexxxel View Post
is the lower one the one that the steering wheel shaft goes into? Because that's where it's leaking....
no,as lm said--the lower can be replaced,,without,removing the box..remove the steer arm[puller], take out the lower snap ring,start truck..take wheel all the way left or right,then snap hit the steer wheel against the stop--pressure will spike in the system,,and SHOULD blow the seals out--have someone watching,so you shut truck off,as soon as seals pop loose..replace------now the top one,,remove the long shaft from the input of the box--slid the two pieces together to get away from box. pry out the outside dust seal,remove the inner snap ring,and hit the steer wheel against the stops with truck running,, to blow this seal loose also--replace--
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Old 12-18-2010, 10:47 PM   #8 (permalink)
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so it sounds like you're saying the steering box can stay on the truck?

I'm confused here...
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'91 F-250 7.3idi XLT Lariat Supercab
Non-Turbo, Bone Stock
E4OD 4x2 4.10 non-posi
6 digit odometer
122,000 miles (197,000km)
still Minty Fresh

Sold my old 90 reg cab @340,000 miles (550,000km)
Still running I'm sure...
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Old 12-18-2010, 11:03 PM   #9 (permalink)
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What about throwing some Lucas Power Steering Stop Leak in it? At least that will take care of it until you're ready to really fix it. That stuff works.
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Old 12-19-2010, 01:16 AM   #10 (permalink)
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Yeah I second that!
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Old 12-19-2010, 07:56 AM   #11 (permalink)
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Quote:
so it sounds like you're saying the steering box can stay on the truck?

I'm confused here...
The bottom seal can be easily changed from underneath the pickup with out removing the gearbox. The top one (upper seal that the steering shaft goes into) is next to impossible to lean over the fender, reach down that far and remove and replace. Best option's remove the gearbox for that one.
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Old 12-19-2010, 10:39 PM   #12 (permalink)
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I think I'll take some stop leak along for the long trip...

Then when I have time to do the fix, I'll probably have the steering box rebuilt at the same time. Why not when it's off the truck anyway... I know a good rebuilder around here... after going thru 3 boxes on my last truck

Thanks guys
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'91 F-250 7.3idi XLT Lariat Supercab
Non-Turbo, Bone Stock
E4OD 4x2 4.10 non-posi
6 digit odometer
122,000 miles (197,000km)
still Minty Fresh

Sold my old 90 reg cab @340,000 miles (550,000km)
Still running I'm sure...
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Old 12-20-2010, 07:03 AM   #13 (permalink)
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I think the long-term answer is to pull one from a yard and rebuild it. Then you get to have the experience of fixing it, and have a spare.
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Old 12-20-2010, 02:31 PM   #14 (permalink)
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I got one from the wreckers for my last truck and had it rebuilt... put it on the truck and it was tight when you turned the wheel one way. The rebuild sucked. After 6 months it was leaking everywhere.

I finally found a place that did a decent job. I guess if you just clean it up and replace the seals, some places call that a rebuild. Because it's such a pain to get on and off, doing it just once would be nice.

I've decided to pull the box and replace just the two seals for now. Nothing wrong with it otherwise, and I don't have the time right now to be down for a week. Would have been nice to wait till I had time for a full overhaul, because I'd like to replace the steering shaft too, apparently there's a bushing in it that wears out... my steering is a little looser than I'd like, but right now I just don't have the time (or the parts)
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'91 F-250 7.3idi XLT Lariat Supercab
Non-Turbo, Bone Stock
E4OD 4x2 4.10 non-posi
6 digit odometer
122,000 miles (197,000km)
still Minty Fresh

Sold my old 90 reg cab @340,000 miles (550,000km)
Still running I'm sure...
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Old 12-28-2010, 12:40 AM   #15 (permalink)
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ok.. any tips on how to remove the seal with the box off the truck? I pried the crap out of the upper seal to get it out... bent it all to crap... is there a better way?
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'91 F-250 7.3idi XLT Lariat Supercab
Non-Turbo, Bone Stock
E4OD 4x2 4.10 non-posi
6 digit odometer
122,000 miles (197,000km)
still Minty Fresh

Sold my old 90 reg cab @340,000 miles (550,000km)
Still running I'm sure...
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