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Old 03-08-2016, 05:47 PM   #1
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U Joint Q

Opinions please. Is it creeping, leave it, replace it?
On our Blue Bird bus, front joint, joint is tight.

The other side of the same X:

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Old 03-08-2016, 06:04 PM   #2
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Don it looks ok to me from a picture, I believe if you are in doubt in any way shape or form.
Just do it,replace it for pease of mind
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Old 03-08-2016, 06:08 PM   #3
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To my shadetree trained eye it looks like the bearing cap may be rotating?
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Old 03-08-2016, 06:13 PM   #4
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Buy a new u-joint strap kit with bolts. Make sure to get the torque correct.
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Old 03-08-2016, 06:57 PM   #5
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To me, the bottom fastener on the bottom pic, looks loose.
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Old 03-08-2016, 07:14 PM   #6
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The cap has moved. It would be moving unless there was some force being exerted somehow. That cap should be spinning without much resistants. Change it, and the bolts and the straps.
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Old 03-08-2016, 07:15 PM   #7
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Thanks all, here's the underside of the strap.



Finding this issue is a result of regular inspections, don't catch them all but I try....
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Old 03-08-2016, 07:16 PM   #8
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Looks deformed.
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Old 03-08-2016, 09:38 PM   #9
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If you are in town, get the parts and fix it.
If you are not, grease it up and drive to town.
It needs fixed,but it should work for a while.
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Old 03-08-2016, 09:42 PM   #10
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For the price of the joint...and now that you have it apart.
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Old 03-09-2016, 01:08 AM   #11
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If it were me I'd change it, if that one cup is turning it's going to wear your yoke so that a new cup won't stay tight. Crosses are cheap yokes are not! That cross is done anyway even tho it feels tight, dollars-to-donuts says its dry as a popcorn ____t and due to become very very loose sometime in the very near future, and you do not want a drive shaft coming appart and crashing round an round an round undernieth nelly bell whilst you try to change lanes and get her off to the side into the emergency lane then try to revive the missus who's just had a cardiac arrest. You get the picture I'm sure!!That being said, that half of of the cross is easy to check by removeing the two straps and attempting to rotate the cups. You'll know right away if it's dry. Quite offten for some reason one side will be short of grease and siesed-up while all the rest of the cups can be well lubed and apparently fine . If you do find that all is well and cups all have grease then for sure clean the recesses and cups and deffinately use a new strap. Then watch it for the next while to make sure it has stopped rotating in your yoke.
Hope my long-winded reply helps.
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Old 03-11-2016, 12:48 PM   #12
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Disassembled the joint, very notchy, the bearing surfaces are toast. Moog 255. The 2 other joints are ok.
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Old 03-11-2016, 01:38 PM   #13
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As I suspected when I saw the pictures. Those cups usually press into the yoke fairly snug when the strap is tightened so when they start to turn there's a reason. Actualy never seen one that goes round an round like that. Most I've dealt with just work back and forth in a short arc.
Any who, good eye on that Don. By rolling round in the grass and eyeballing things you just saved yourself a world of roadside griefe.
Cheers.
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Old 03-14-2016, 06:13 PM   #14
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The correct part is 351A. 255 wasn't even close even though it was on the part.
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Old 03-14-2016, 06:19 PM   #15
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Mensch! Someone failed to lube that U-joint. Those, as well as the slip joint on the drive shaft, need to be lubed regularly. You might want to check the other U-joints while you're at it.
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Old 03-17-2016, 04:09 PM   #16
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2 shaft phase q.

The 3 joint yokes are now all lined up, they were set up with the front 90* off the rear 2 which are of course lined up. OK?
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Old 03-17-2016, 06:47 PM   #17
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Just road tested all OK, nice and smooth.
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Old 03-17-2016, 06:55 PM   #18
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Glad it all worked out for you.
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