Quirky auto hub problem - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 17 (permalink) Old 02-14-2019, 02:53 AM Thread Starter
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Quirky auto hub problem

I’ll try to be brief. My auto hubs aren’t working, even though I can use manual hub locks I’m annoyed that I can’t get auto to work. Passenger side locks in when in auto, drivers side locks in, but disengages on its own by about the time the vacuum pump turns off. I’ve tried a dedicated line from solenoid to the driver hub with the same result. I checked solenoid operation with 12v to the center pin and ground to the pin closest to firewall results in a click and vacuum sound. Ground to the front pin does not result in any clicks or sounds. Is this normal operation? I’m left thinking that either solenoid is bad, or there is a problem with driver side hub.
If there was a leak in hub would it engage at all? Would a bad hub or leaking seal allow hub to lock but then release 30-60 seconds later? Thanks for any help!
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post #2 of 17 (permalink) Old 02-14-2019, 03:03 AM
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Re: Quirky auto hub problem

Sounds like a vacuum leak on the drivers side hub

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post #3 of 17 (permalink) Old 02-14-2019, 03:54 AM Thread Starter
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That’s what I was afraid of. I had to tear into one on my 7.3 and it wasn’t that fun messing with that large seal. I may just live with it and deal with the manual locks for rest of winter and mess with hub when it’s warmer.
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post #4 of 17 (permalink) Old 02-14-2019, 10:14 AM
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The knuckle seal that’s pressed onto the axle is liklely the issue. Try using a vacuum pump right on the knuckles fitting to confirm

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post #5 of 17 (permalink) Old 02-15-2019, 01:15 AM Thread Starter
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I just found it weird that it would lock in for a minute or so. I figured that if the seal was bad it wouldn’t build enough vacuum to lock the hub at all. With that said I did try a handheld pump with gauge right on fitting and it wouldn’t build up vacuum no matter how much I pumped. Guess that settles it. Thank you for all your replies. It’s always appreciated.

Random side note...why does the oil pan use a copper crush washer and not some type of rubber washer? Who ever changed oil before I bought it must not have changed the washer. It drips/weeps ever so slightly. Sometimes not eneough to put a drop on floor overnight but I can see it on plug. I plan to wait it out until next oil change, I don’t want to lose a bunch of oil trying to remove plug and change washer quickly.
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post #6 of 17 (permalink) Old 02-15-2019, 06:47 AM
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Re: Quirky auto hub problem

I have removed the plug with a full oil pan. You lose a little, but if you are quick and keep upwards pressure on the plug as you remove it, you can do it without losing much or making a big mess.

I prefer the copper washer myself, I would think a soft gasket might have issues also.

That said, I installed the Fumoto valve for my oil changes.

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post #7 of 17 (permalink) Old 02-15-2019, 01:03 PM
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Re: Quirky auto hub problem

You can also put a shopvac on the oil fill tube and turn it on. The vacuum will keep the oil from pouring out when you pull the plug.
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post #8 of 17 (permalink) Old 02-16-2019, 12:54 AM
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Re: Quirky auto hub problem

I bet you can also fill your shopvac with oil lol
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post #9 of 17 (permalink) Old 02-16-2019, 10:36 AM
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Re: Quirky auto hub problem

If you can pull oil from the pan up through the heads and into the shop vac. You have one badass shop vac.
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Rev tech 4" lift, 37" military wrangler Mt tires
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post #10 of 17 (permalink) Old 02-16-2019, 11:47 AM
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Re: Quirky auto hub problem

I am not trying it ;0

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