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Unread 11-03-2013, 05:55 AM   #1
John Strenk
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Bubbles in tranny oil

Anyone know what causes this?

It's never been in deep water

the tranny is stone cold, just some 'friend' got it stuck in 4th so i removed the top to fix it and found this




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Unread 11-03-2013, 06:07 AM   #2
Matt1981CJ7
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The pic isn't posting for me, John.

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Unread 11-03-2013, 06:33 AM   #3
86cj74.2L
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Just condensation?

Grammys CJ would on occasion build up water in the rear axil. Only way to explain it since all she does is drive to work. And 8 miles isn't enough to get things up to temp.
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Unread 11-03-2013, 08:32 AM   #4
LumpyGrits
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X2 on condensation of cold oil.
You get the same thing inside the engine etc also.
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Unread 11-03-2013, 09:12 AM   #5
JeepHammer
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Moisture or other contamination.

Overheating by over compression of the oil can cause it also...
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Unread 11-03-2013, 05:47 PM   #6
bruteboy
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incorrect type of oil or an additive has been added
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Unread 11-03-2013, 06:34 PM   #7
LumpyGrits
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Quote:
Originally Posted by bruteboy View Post
incorrect type of oil or an additive has been added
Your source for this info?
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Unread 11-03-2013, 07:23 PM   #8
MoneypitCJ5
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Are they JUST bubbles? It looks like aerated oil to me. I would expect condensation to cause white film on the sides of the case, like the junk that gets on oil caps sometimes.
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Unread 11-04-2013, 03:11 AM   #9
John Strenk
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Yeah, they are bubbles. No scum like I'm use to see in some old engines.
And I use the jeep mainly in the winter to plow snow so condensation could be it.

Feels rather thin to be the 120 wt I put in there.
Don't ask, I need to mark my containers better..

Oh by the way, don't drive your jeep with the cover off the tranny...

I drove it just 20 ft to work in the garage only to have a huge oil spill over the exhaust pipe....
Were is that dope slap icon....
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Unread 11-04-2013, 03:32 AM   #10
86cj74.2L
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When Grammys rear axil built up enough moisture to vent and freeze out the breather vent. Which would build pressure and then burp more oil. When I dropped the cover to drain it out it was just a coffee with a lot of cream color. No foamy cake like engine oil.

Those 8 mile trips since 1986 are probably what kept the trans happy. It's still original with 160,000 on the clock now. A999 (Grammy don't do stick)
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