Screaming Bearing sound - Defender Source
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  #1  
Old February 12th, 2009, 12:01 PM
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Screaming Bearing sound

Sometimes a loose rattle sound and sometimes a full on screaming bearing. Comes and goes mysteriously. It is coming from the tranny/t case area. I had hoped for a dry u joint and pulled both shafts. Ended up putting a u joint on the front shaft but that had no impact on this noise. The tranny is full of mtl. The tcase is full of royal purple synthetic gear oil- no leaks on either. The throw out bearing/clutch etc are all new. This noise happens when the truck is in motion and I can hear it both in gear or when coasting up to a light in neutral. I'm thinking one of the output bearings on the t-case but both flanges are tight with no play. I went so far as to pull the p brake drum to make sure on the back and couldn't find an issue there either.

Any one else here ever have a similar scenario or ideas where to look ?
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  #2  
Old February 12th, 2009, 12:05 PM
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The parking brake was going to be my suggestion. Is it possible something is loose in there and rubbing against the drum? I know when you get stones trapped in the mud shield on discs it can create a screeching sound. Is it possible a spring broke in there or something and is causing this?
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Old February 12th, 2009, 12:08 PM
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no its all ship shape and I went so far as to adjust it while I was in there
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  #4  
Old February 13th, 2009, 05:11 PM
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bump for ideas
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  #5  
Old February 14th, 2009, 08:40 PM
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Does the screaming vary with the speed of the truck? Or does it change with the speed of the engine?
Might not hurt and pull one then the other driveshaft and drive around in Difflock.
Noises come from all over but the source always seem to be somewhere else. Case in point. Karens disco had a clunk, for weeks I figured it was the ball joint on the rear A arm, I even started the daily spraying of PB Blaster. Turns out it was a loose front shock tower.
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  #6  
Old February 15th, 2009, 10:12 AM
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Keith,
Seems to be isolated to t-case or drive shafts. Pulled both shafts and one u joint had no needle bearings fixed that, the others seem fine and are well greased. Parking brake assmbly woking well and I checked it out also looks good to go. Slip joints on shafts also well greased splines in good shape. The way it comes and goes is driving me crazy. The sound is speed dependant, the truck can be in neutral rolling up to a stop and make the noise. More often it makes the sound when under load.
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  #7  
Old February 15th, 2009, 10:34 AM
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Drive it around for a while and see if there is a temperature difference between the front and rear output, also check the temp on each rim as well to see if it might be a wheel bearing.

Is it possible with your setup to leave the center diff open and drive with the parking brake applied so the rear transfer case output is not moving? I think you might have to remove the rear driveshaft but am not sure since the t case was different on the early 110ís.

Also check you diff, trans and t case fluids and see if you can see any little meal bits or if the color looks odd.
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Old February 15th, 2009, 11:32 AM
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Dave,

Its a complete 93 Tdi drivetrain-except the axles which are 95's . I can run without either shaft. I have repacked the wheel bearings and lubed the u joints with a high temp marine synthetic grease- good shite

http://www.tractorsupply.com/webapp/...&Special=false

pretty sure this sound is comming from directly below the right side floor board.
Good idea on the temp gun- I'll try that.
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  #9  
Old February 15th, 2009, 11:34 AM
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It took me years to find out what was wrong with mine (LT77/LT230). At first I thought it was caused by the seized spline on the front prop shaft. Although it appeared to be well greased, the local driveshaft shop wasn't able to pull it apart.

There was a periodic squeaking/rubbing noise that I could stop by lightly applying the hand brake. I think that was a symptom of a sloppy bearing on the output shaft, and the light braking centered things up a bit, but that's just a guess.

The last straw that caused me to finally swap in the spare gearbox I acquired years ago, prompted by my "strange noise" collection, happened on the way back from Maine a few months ago. There was suddenly a combination of screeching and jerking. It was intermittent, but severe enough that I thought I might have to stop driving. I thought the T-case had run dry, but it was only a bit low on oil. After topping up, I was able to drive home (and for weeks after) without incident. I drained the T-case and found some bits of steel (bearing cage material??) that reminded me of pennies placed on a railroad track. Apparently the screeching and jerking were the musical accompaniment to the flattening of the stray bits of metal.
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  #10  
Old February 15th, 2009, 11:39 AM
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John,

Did you take the output shaft flanges off ? was it one of those that grenaded ?
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  #11  
Old February 15th, 2009, 11:51 AM
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No, I didn't take them off, but I could feel that they had a lot of play. Of course, it's possible that an internal bearing could shed some bits, while the output bearings would be okay. If you drain the oil, you might find some incriminating bits of metal. With the drain plug out, you could also stick your finger in to probe for surprises. Be careful -- the surprises could be sharp.
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  #12  
Old December 29th, 2009, 10:17 PM
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Did you ever get this resolved and if so, what was the cause?
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  #13  
Old December 29th, 2009, 11:09 PM
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there is a disc that rides behind the front output shaft flange. the disc is meant to protect the seal. in my case when all covered up with grit the disc was spining and touching the aluminum case and making the noise. That disc isn't meant to spin.
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  #14  
Old December 30th, 2009, 01:59 AM
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I hate to say this, but I have seen something like this twice (where nothing easy to get to caused the issue) and both times it was the input bearing on the transmission.

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  #15  
Old December 30th, 2009, 04:24 AM
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Drain the oil and see what comes out them drop the rectangular cover at the bottom of he transfer case, check the intermediate gears. they run on a pair of small tapered roller bearings- I've had them fail and it makes a nasty noise that's road speed related.
I never did strip the transfer case that failed in Africa despite carrying it all the way home!
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Old December 30th, 2009, 12:01 PM
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As I have a autobox, I'm not familar with LR manual trany's. But this sounds like a problem I once had with a '71 Dodge van. The problem turned out to be a bronze bushing (pilot bearing) in the center of the rear of crank shaft had gone egg shaped allowing the trany shaft, that went into it, to become off center at times. Made a hell of a racket! Could temporarely correct it by push the clutch in & out rapidly till the shaft centered itself. Had to cut the bronze bushing in half to get it out so it could replace it.
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Old December 30th, 2009, 05:39 PM
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Guys- that post was from Feb, unless Joel is having a similar issue. Doug has a new truck, and Gustavo has the 110 me thinks.
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  #18  
Old December 31st, 2009, 10:04 AM
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Nothing like resurrecting an old post.
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  #19  
Old December 31st, 2009, 12:07 PM
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Joel was having a noise and revived it. Think he has figured his out as well.
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  #20  
Old September 15th, 2010, 05:09 PM
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This thread should be sticky'd. I too experienced this noise and was dumbfounded on what it was as it was intermittent. Crawling under the truck didn't show anything unusual until I did a search on the forum and found this thread. My noise turned out to be the same thing! A little silicon and everything is good as new.
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