Auto lock hubs - Ford Powerstroke Diesel Forum
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post #1 of 34 Old 04-13-2014, 12:29 PM Thread Starter
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Auto lock hubs

I have issues with my auto lock hubs working, I have narrowed the problem down to the hubs themselves. They are not holding a vacuum. I have looked at a diagram of the wheel/hub assembly and only see the rear grease seal other than the O ring on the hub. Are these the only two seals that can be compromised and cause a leak. I would like to get them working but not sure if its as simple as just changing those two seals. Any input from the experienced will be great. Thanks.

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post #2 of 34 Old 04-14-2014, 12:21 PM Thread Starter
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Nobody has anything??

2005 F350 Lariat Crew-cab Long Box
Upgraded FICM with PHP Hercules tune
Edge Insight with EGT probe and Turbo timer
Diamond Eye 5" Performance exhaust with muffler delete
Blue spring update
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post #3 of 34 Old 04-24-2014, 12:38 PM Thread Starter
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Well based on the sound of crickets from this post i assume that no one really knew anything about the hub seals. So i hit the Ford dealer and started going through diagrams and getting the seals it looked like i needed. I figured I would share what i did and the results.

There are a number of vacuum seals, 6 (each side)from what i count. Ill post some pix and hope they come through.

There is the locking hub seal and the paper gasket and there is(im guessing since i did tear the locking hub apart) a seal around the selection knob. A big O ring just behind the bearing assembly and then a big seal in back to seal the axle from the hub. Also a O ring around the ABS sensor.

My problem was the big seal axle seal, totally roached. The axle seal cost me $60, the big O ring was $8 and the hub rebuild kit was $24. I didn't change the ABS sensor O ring and I didn't tear the locking hub apart. I would have done that had the rest not solved the problem. But changing these 3 seals solved my vacuum leak in the front hubs and the auto lock feature now works.

Hope this helps someone out there.
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workin350, rowekmr, WBFD47 and 2 others like this.

2005 F350 Lariat Crew-cab Long Box
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Edge Insight with EGT probe and Turbo timer
Diamond Eye 5" Performance exhaust with muffler delete
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post #4 of 34 Old 04-24-2014, 12:41 PM Thread Starter
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Pictures continued.
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2005 F350 Lariat Crew-cab Long Box
Upgraded FICM with PHP Hercules tune
Edge Insight with EGT probe and Turbo timer
Diamond Eye 5" Performance exhaust with muffler delete
Blue spring update
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post #5 of 34 Old 04-25-2014, 07:41 PM
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Thanks for posting how you got it fixed. Now we know for the next time someone has similar symptoms.


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post #6 of 34 Old 05-02-2014, 05:50 PM
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rrancourt, Howdy;

Thanks for sticking with it to find your cure.
Mine just developed.
Replaced the soft rubber vacuum lines today
and no smile this evening. Thought I'd go to
the pulse valve on the Passenger wheel well next.
Is there a better way to troubleshoot without
a vacuum gauge to find where the leak is?
Again, thanks for the time you've already put in.

hank

Striving for a less complicated life since 1949 ...

2004 F-250 Birth date 07/25/2003
107+K miles at last oil change
FICM up graded by Swamp's 06/'13
The rest, as far as I know is totally Stock
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post #7 of 34 Old 05-02-2014, 06:16 PM Thread Starter
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Unplug the rubber lines from the steer knuckle and plug them off. KOEO put your heater on vent (so you can easily feel the air blowing), fan on high. Turn the 4x4 knob on and if the airflow switches to the defroster then there is a leak. Go back to where it tees off and try an see if you can determine if its one side or the other. My leak stopped as soon as I capped of the lines on both hubs. Its more tedious then it sounds lol.
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2005 F350 Lariat Crew-cab Long Box
Upgraded FICM with PHP Hercules tune
Edge Insight with EGT probe and Turbo timer
Diamond Eye 5" Performance exhaust with muffler delete
Blue spring update
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post #8 of 34 Old 05-02-2014, 06:37 PM
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rrancourt, Howdy;

That's how I realized that mine was a vacuum problem.
Reckon I'll plug off the lines one at a time and see if it's
one side or the other, or elsewhere.
Thanks for the quick reply.

hank

Striving for a less complicated life since 1949 ...

2004 F-250 Birth date 07/25/2003
107+K miles at last oil change
FICM up graded by Swamp's 06/'13
The rest, as far as I know is totally Stock
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post #9 of 34 Old 05-02-2014, 07:02 PM Thread Starter
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No problem. I unplugged one hub and tried it, leak. Plugged that hub back I'm and unplugged the other, leak. Unplugged both and no leak so I knew that both hubs where the problem. Just have to keep working backwards from the hubs.
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2005 F350 Lariat Crew-cab Long Box
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Edge Insight with EGT probe and Turbo timer
Diamond Eye 5" Performance exhaust with muffler delete
Blue spring update
High Idle Mod
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post #10 of 34 Old 05-17-2014, 09:22 AM
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why not just go to manual locking hubs???
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