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  #1  
Old October 13th, 2011, 01:44 PM
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tube from differential

I have been slowly changing fluids etc in my somewhat new to me '84 90 and made two discoveries which are a mystery. I searched previous posts but nothing quite fits...
1. I unscrewed the fill hole in the front diff and at least 4 ounces of oil came out. Rear was much less, maybe 1-2 ounces. How could this be? It looks like oil, no water.
2. There is a tube running from the top of the rear axle, goes into the chassis and who-knows-where from there. The front has no tube, just a fitting. What is that?
Thanks!
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  #2  
Old October 13th, 2011, 01:49 PM
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Bill Adams
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1. If there is water in the diff the oil will be milky. Don't know if it's overfilled or what.
2. axle breather tube equalizes atmospheric pressure to keep water out of axle
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  #3  
Old October 13th, 2011, 02:11 PM
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Quote:
Originally Posted by Sandt View Post
There is a tube running from the top of the rear axle, goes into the chassis and who-knows-where from there. The front has no tube, just a fitting. What is that?
FYI the front axle fitting should have a tube on it. On my truck both tubes are run up above the engine and then make a 180 degree "u turn" to prevent water getting in from the outside.

Without the tube, if you ford through deep water, there is a chance that water can get into your diff.
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  #4  
Old October 13th, 2011, 02:37 PM
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I'm pretty sure Unimogs actually put some positive air pressure in the vent lines to prevent water seepage into the diffs.

Could be someone just overfilled them.
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  #5  
Old October 13th, 2011, 04:36 PM
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Thanks for the replies.
Follow up question:
How could it get overfilled? Wouldn't the oil just keep flowing out the fill hole?
Thanks!
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  #6  
Old October 13th, 2011, 05:21 PM
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William Skidmore
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Check to see if there is a fill hole and the back side of the diff higher then the fill plug on the front.
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  #7  
Old October 13th, 2011, 05:44 PM
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Gardner Congdon
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Gear oil level

Hey Sandt-
I noticed the same thing on mine. I suspect there's a practice in the UK to "over fill" the diffs. One could do this by filling the axle case while one end (with the shorter shaft) was jacked up in the air.
-Gardner
How's the weather back there? Used to live in Durham, NH then Newburyport, MA for a while. I miss the clams.
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  #8  
Old October 13th, 2011, 06:19 PM
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If the seals between axle tube and swivel balls are bad then the oil from them goes to the differential overfilling it. From the fitting in the top of the axles goes a tube all the way up to the engine bay. There goes 2 more from gearbox and transfer case also. In the D110 the one from the rear axle just goes up in the chassis somewhere, don´t know if in the D90 is the same.

Cheers,
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  #9  
Old October 14th, 2011, 01:44 PM
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Swivel ball oil? Didn't get to that yet. I'll look into that next. I would have thought it was grease...
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  #10  
Old October 14th, 2011, 02:42 PM
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Huge debate over which is better. To each there own.
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