Northwest Tacomas

Go Back   Tacoma World Forums > Regional Discussion > Regions > North West

Notices

Blown axel seal & rear diff breather

Reply
 
Thread Tools Search this Thread
Old 10-07-2013, 09:53 AM   #1
Eazy.E [OP] Eazy.E is offline
Member
Eazy.E is on a distinguished road
Name: Erik
Joined: Jun 2013, #106148
Location: The Great Northwest (arlington,wa)
Gender: Male
Posts: 53
Eazy.E's Tacoma Gallery
Blown axel seal & rear diff breather

Back when I bought my tacoma I had my mechanic give it a once over an he found that my right rear axel seal was blown saturation my right shoes with diff oil. Long story short we replaced the bearing and seal and all was good with the world. I have since had no issues.
So last weekend I had a little spare time and relocated my rear dif breather. When I unscrewed the stock breather a substantial amount of pressure was released. That being said I wish I would have done the mod earlier and left me with the question; does anyone think that a clogged dif breather could build up enough pressure in the rear end to blow an axel seal? I think its possible and could be the reason behind the blown seal in the first place.
  Reply With Quote
Old 10-07-2013, 12:52 PM   #2
Senior Member
obscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud ofobscurotron has much to be proud of
Joined: Apr 2012, #77839
Location: Bay Area, California
Gender: Male
Posts: 435
obscurotron's Tacoma Gallery
A clogged breather can definitely cause axle seals and other seals to leak. Most seals (but not all) are designed to retain fluid under more or less no pressure. Obviously that's not the case for things like head gaskets, fuel system, cooling system and certain transmission stuff. But for a rear differential, a couple of PSI can cause lube to blow past a seal. The older and more worn the seal, the less pressure it takes.


Also, are you sure the diff had positive pressure and not negative pressure, when you pulled the factory breather? Usually when a diff gets hot, air heats up and escapes from the breather (as you want). When it cools, the breather seals up (small rubber disc under the metal cap) and the air cools, reducing its volume. The result is a slight vacuum. You might have been hearing air rushing in. When I change my rear diff fluid, even with the extended breather, I get air rushing in when I remove the fill plug.


Either way, sounds like you're fine - the seal is fixed and you're dealing with the breather, just in case!


Quote:
Originally Posted by Eazy.E View Post
Back when I bought my tacoma I had my mechanic give it a once over an he found that my right rear axel seal was blown saturation my right shoes with diff oil. Long story short we replaced the bearing and seal and all was good with the world. I have since had no issues.
So last weekend I had a little spare time and relocated my rear dif breather. When I unscrewed the stock breather a substantial amount of pressure was released. That being said I wish I would have done the mod earlier and left me with the question; does anyone think that a clogged dif breather could build up enough pressure in the rear end to blow an axel seal? I think its possible and could be the reason behind the blown seal in the first place.
  Reply With Quote
Old 10-08-2013, 07:15 AM   #3
Eazy.E [OP] Eazy.E is offline
Member
Eazy.E is on a distinguished road
Name: Erik
Joined: Jun 2013, #106148
Location: The Great Northwest (arlington,wa)
Gender: Male
Posts: 53
Eazy.E's Tacoma Gallery
Thumbs up

Quote:
Originally Posted by obscurotron View Post
A clogged breather can definitely cause axle seals and other seals to leak. Most seals (but not all) are designed to retain fluid under more or less no pressure. Obviously that's not the case for things like head gaskets, fuel system, cooling system and certain transmission stuff. But for a rear differential, a couple of PSI can cause lube to blow past a seal. The older and more worn the seal, the less pressure it takes.


Also, are you sure the diff had positive pressure and not negative pressure, when you pulled the factory breather? Usually when a diff gets hot, air heats up and escapes from the breather (as you want). When it cools, the breather seals up (small rubber disc under the metal cap) and the air cools, reducing its volume. The result is a slight vacuum. You might have been hearing air rushing in. When I change my rear diff fluid, even with the extended breather, I get air rushing in when I remove the fill plug.


Either way, sounds like you're fine - the seal is fixed and you're dealing with the breather, just in case!
Ooh now you've got me trying to remember! I'm fairly certain it was positive pressure. I'm going to check out my left rear brake drum just to make sure it hadn't caused an issue with the opposite older seal. But like you said I think in fine. Thanks for the input!
  Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
SCUBA MOD - Relocating Front & Rear Diff, Tranny, Transfer Case and E-Locker Breather Shadow-Warrior Off-Roading & Trails 65 01-08-2014 07:02 AM
Rear Axel Seal Replacement?! Should I?? IgnorantlyAlberta Technical Chat 18 09-18-2013 11:25 PM
Advice on a leaking rear axel seal... Itisreallycold 1st Gen. Tacomas 8 09-13-2013 10:59 AM
rear seal fail...new axel sedrock 1st Gen. Tacomas 11 11-23-2011 10:37 PM
leaky rear axel seal markrobertdog Alaska 0 04-26-2011 12:59 PM


Copyright © 2014 Tacoma Forum. Tacoma World is not owned by, or affiliated with Toyota Motor Corporation.