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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 08-19-2011, 12:04 PM
SemperFi_Marine SemperFi_Marine is offline
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Carrier Bearing Problem

What would cause a carrier bearing to push out and tear itself up? Just installed new bearing, drove 15 mi and bearing has moved 2-3 inches towards rear and eaten itself alive. Will have to re-replace but am concerned that it's another issue causing prob and do not want a repeat. Don't understand what would cause the whole drive shaft to shift like that. Please help.

1992 F250 7.3L IDI 5-Spd 4WD
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Old 08-19-2011, 01:05 PM
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The front shaft should be mounted solid(by means of Ujoint) to tranny output, so not sure how the carrier bearing walked off the back? The shaft would have had to move forward? But how? There is no real "load" either way so it shouldn't want to move.

Did it go back in with a bind? Did you install the Ujoint first, then hang the bearing? Did the holes line up with mount?

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Old 08-19-2011, 04:05 PM
SemperFi_Marine SemperFi_Marine is offline
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That's what I'm confused about. I don't understand how it could move. Splined slip yoke up front on transfer case, joint u-bolted on rear diff to "cradle" yoke, lined up and bolted to bearing mount. No problem. 7 miles down road the rubber "boot/shroud" was beginning to melt. Got it back home and had separation of bearing and boot. It's possible the bearing was defective and seized AFTER installation but I just have difficulty believing it. It doesn't make sense and with the rapidity of the gross failure, I want to be sure nothing else could cause it to repeat. Don't have the time or desire to have to do it a third time. I'll try to post pics if anyone thinks they could help.
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Old 08-19-2011, 05:54 PM
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Pictures speak a thousand words. Did you happen to notice if the rubber insulator was being compressed after you installed it? Was the bearing installed facing the correct way?
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Old 08-19-2011, 07:41 PM
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Oh, you may want to modify the title of your post a bit, I thought you were talking about the carrier bearings in one of the differentials!
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Old 08-19-2011, 08:57 PM
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Quote:
Originally Posted by redmondjp View Post
Oh, you may want to modify the title of your post a bit, I thought you were talking about the carrier bearings in one of the differentials!

No need to change anything... He got it right...

Carrier bearing ....Click the image to open in full size.
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Old 08-20-2011, 02:14 PM
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No compression/distortion of rubber insulator. Bearing installed by shop as I am not setup to press it on myself. The mech was very careful to get it on the correct way.
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Old 08-20-2011, 02:22 PM
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You need to host these photos somewhere like photobucket or flickr, then post the link to them here.. We can't see photos on you hard drive....

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Old 08-20-2011, 02:30 PM
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yeah i'm trying to figure that out right now
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Old 08-20-2011, 02:42 PM
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Pictures by semperf_marine - Photobucket
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Old 08-20-2011, 03:47 PM
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check all of your mounts , tranny and motor , and cross member bolts , and also check the transfer case to see if any thing slid back and pushed against the bearing ! check your rear end also and see if all the u-bolts are still tight and it did not move forward !
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Old 08-20-2011, 03:55 PM
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Dang!!! Only three things I can think of that would cause that,
(1) wrong bearing (as in center wrong size (allowed bearing to move))
(2) Bad trans and engine mounts (not likely but possible)
(3) defective bearing (locked up)

I don't have one out to inspect it but I did go out and look at mine, and checked my NAPA web site, and don't see any difference as in a front or rear to the bearing.

I know this is no help but maybe it will get it back to the top for sharper brains, and eyes to see it..
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Old 08-20-2011, 06:22 PM
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Quote:
Originally Posted by White 97 xlt View Post
No need to change anything... He got it right...

Carrier bearing ....Click the image to open in full size.
D' op! For some reason (super-bad headache at the time maybe) I was thinking of the pinion bearing.
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Old 08-20-2011, 06:33 PM
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Where the slotted holes are that the bolts to the crossmember go to it looks like the bolts are all the way to one side of the slot. Did you have to force or pry on it to get the bolts in there? The only other thing I can think of is the bearing was not installed correctly. The couple carrier bearings I have replaced didnt look exactly like what I removed... cant remember exactly what was different. It is easy to damage one even for an expereienced mechanic.
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Old 11-27-2011, 09:28 PM
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Folks my f-350 SRW is on the third one since June of 2009. I chalk the first up to bad install. It failed in two months, the second lasted from aug '09 thru nov '11.

For some reason, I think my problem is made worse when I tow my fifth wheel. At first I thought that hitting dips and buckles were causing the trailer to squat the bed ( I do have air bags installed) and that squatting might cause more axial displacement. My line of thinking was that maybe lack of proper lubricant in the splines may have caused the shaft to move because of resistance in the splines.

I still do not know what is causing the problem, but after a 10 hour pull, I had a failure, and two years later another failure after a 12 hour pull.
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Old 11-27-2011, 09:28 PM
 
 
 
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