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  #1  
Old 08-05-2010, 02:41 AM
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Default Birf soup

So here is my issue a couple of months back I replaced the birf(used an new OEM birf from Cruiserdan) on the drivers side of my 94 FZJ 80. I also used all new gaskets and Marlin oil seals. Well the other day Treeroot noticed that the knuckle was covered in 90 weight. At the time we assumed that the oil seal had failed. This evening I pulled the knuckle apart only to find the Marlin seal looks brand new and the knuckle was indeed full of 90 weight. I then assumed that maybe the axle itself has a groove, however it is smooth with no visible defects.
The only thing that I have found out of place was that the diff breather was clogged. My question is if that is enough to completely wash the grease out of the knuckle and fill it with 90 weight? Anyone else have this happen or have any idea where I should look?
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Old 08-05-2010, 06:26 AM
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Wasn't there an issue with this axle being hit as well?
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Old 08-05-2010, 09:26 AM
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I don't believe so. The only hit the previous owner mentioned was hitting the passenger side bumper on the scoop of a snow plow.
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Old 08-05-2010, 09:30 AM
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I guess its feasible the pressure built up enough from clogged breather to blow oil back through the seal and into the knuckle.... ??? ...emphasis on 'guess' .....
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Old 08-05-2010, 09:56 AM
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I've had the pinion seals leak on several 'cruisers with plugged breathers. After unclogging the breather and installing a vent tube, the pinion seal leak stopped. Given that your parts are new, I'd sure unclog, repack, monitor the situation, and not dig deeper for now.
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Old 08-05-2010, 10:07 AM
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A clogged breather will DEFINITELY cause leakage. Whatever the weakest seal is, that is where you will leak.

The temperature change from a cold axle to a hot one is several hundred degrees. P1/T1=P2/T2, so the pressure inside without a working breather is increased several hundred times when you go from cold to hot.
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Old 08-05-2010, 12:53 PM
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Agreed with others from what I've read and specifically with regard to the 80 series...

I'm still getting moly grease into the gear oil in my front diff after my rebuild last year. After searching around MUD I found threads/posts from others with the same experience and the answer as to why appears to be a blocked diff vent causing a vacuum. In my case it seems to be more from the knuckle to the axle vs. your situation. Regardless, I'm going to extend the breathers and I'm betting when I do so I'll find that the diff vents are blocked.
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Old 08-05-2010, 01:12 PM
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I decided to put it all back together and run it. Hopefully it was just the breathers. I am hoping somehow I didn't bend the axle housing.
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Old 08-06-2010, 08:53 AM
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Ye'all jut need to swap out all your Lube and grease w/ backwoods goop ! Duh.... Rookies...... Lol
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Old 08-06-2010, 09:24 AM
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Quote:
Originally Posted by TIMZTOY View Post
Ye'all jut need to swap out all your Lube and grease w/ backwoods goop ! Duh.... Rookies...... Lol
LOL!!!
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