u-joint flange bolts seized - Ford Powerstroke Diesel Forum

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post #1 of 17 Old 04-25-2014, 12:23 PM Thread Starter
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u-joint flange bolts seized

I am helping a friend replace ujoints in his rear driveshaft. The 12mm 12 point bolts are seized. I have tried everything and can not break them free. I have tried a 3' pipe on a breaker bar and broke a Matco socket. Lets put it this way, I have no more 12mm sockets left, all broken. It has been sprayed with pb blaster for 3 days. I tried an impact but the angles are just wrong. Has anyone successfully changed u-joint under the truck using a c clamp? I am going to weld the matco back together and maybe sleeve it but i dont want to break the bolts. thanks
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post #2 of 17 Old 04-25-2014, 12:29 PM
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The ones up on the transfer case?

Use a box wrench and a pipe, they should break long before you break a socket they are so small. The socket much have been on an angle

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post #3 of 17 Old 04-25-2014, 12:48 PM Thread Starter
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No, the other end. I am having issues with the pinion flange bolts. They are the 12mm, 12point bolts. My Matco socket was a tight fit so I tapped it on all the way. No extension and straight on. It was not angled, just split the socket. I tried a box end wrench with a pipe but after flexing the wrench about 30 degrees I have no more throw. It is also a Matco and I can see the shaft bending. There is one bolt head that got a little messed up when the matco socket broke.

Last edited by schemi; 04-25-2014 at 12:52 PM.
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post #4 of 17 Old 04-25-2014, 12:51 PM
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Which type of flange does it have at the pinion end? Straps? or the flat flange?

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post #5 of 17 Old 04-25-2014, 01:38 PM Thread Starter
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flat 4 bolt
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post #6 of 17 Old 04-25-2014, 01:47 PM
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can u get an impact on those or not enough room ?

I have all the parts to do mine but I have been procrastinating LOL


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post #7 of 17 Old 04-25-2014, 01:49 PM
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Then there is no way it bolts that small should be able to put wrenches to that much strain. There just inst enough meat there, the heads should be snapping off long before you break the wrench. Not that that's a good thing either.

I would just heat the damn things. The flanges can take quite a bit of heat without weakening. Even a propane torch works... tedious but it works.

Or wobbly Impact sockets also exist. Ones with a joint in them, they are very nice to have.

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post #8 of 17 Old 04-25-2014, 02:00 PM Thread Starter
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I have been having bad luck with breaking sockets this year. Broke 3 removing jeep hubs. All high end sockets too. maybe it is time to go cheap. Bad thing is they are putting the 12 point on all this stuff so impact sockets are out. Can these joints be taken apart with a c-clamp?

Last edited by schemi; 04-25-2014 at 02:19 PM.
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post #9 of 17 Old 04-25-2014, 02:39 PM
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I don't c why not ( c what I did there ? LOL )
you thinking of just leaving it bolted in ?

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post #10 of 17 Old 04-25-2014, 02:53 PM Thread Starter
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Yes. I have done plenty of ujoints in my press. I am not sure how much force these take to press out.
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