Front TC output shreik! - Defender Source
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  #1  
Old November 16th, 2009, 10:55 PM
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Owen Jones
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Front TC output shreik!

I am trying to locate and resolve a problem that has happened twice now while returning to Denver from Moab. on the long downhill ride into Denver a loud metallic squawking develops. It actually sounds dry and lessens when power is applied and is loudest when power is lifted off. All this is in top gear at highway speeds - no vibration. the noise gets loud enough to turn heads. It performs well in all other respects.


The first time I garaged the truck and come back a couple of days later to check it out. all is quiet and normal!



The second time I garage it, put it up on axle stands, run the engine and transmission and the noise persists. I shut it down and got under to turnover the transmission in neutral. I find a distinct squeal coming from the front TC output. It can be reproduced by rotating the front driveshaft forward and backwards. I noticed a little side to side play in the flange, but normal I'd say.



The following week the noise cant be reproduced. I pulled the TW front prop shaft and the front output flange. The oil seal surface on the flange is grooved but all was dry externally with no leakage. Behind the seal appears to be a trace of some gritty debris but otherwise nothing unusual. The seal looks warn. The oil level was good and its reaching all the parts.



What could this noise be caused by?

A front bearing race spinning in the housing? Could it be the warn seal? I donít think so.



And another question, can the seal be replaced without removing the TC from the truck?

Thanks in advance for any clues!
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Old November 16th, 2009, 11:17 PM
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http://www.discoweb.org/tcasebearing/index.htm

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Old November 17th, 2009, 01:08 PM
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Owen Jones
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Thanks for the link evilfij - great info to replace the seal and bearing.

Owen
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Old January 2nd, 2010, 11:39 PM
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Owen Jones
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OK found the noise - after changing TC front output bearing and seal...

For the record...

The source was a dry and worn front ball swivel in the custom front prop-shaft double-cardon. Pumped it full of grease for now and will get it fitted with a replacement pin and ball. It had been left out of the routine greasing schedule - operator error!
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