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Old 11-14-2011, 02:34 PM   #21
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by David K View Post
I am not nuts (on this anyway).

The rubber disc sits on the opening, and the spring pushes down against it. You can blow air out of the diff side with some force to open the valve... as in hot gasses escaping the diff..

However, unless that spring and rubber disc is removed, you cannot blow air into the diff. Blow as hard as you like! The water is NOT getting in here with that disc and spring in place. It gets in past the axle seals.

Putting a 2 way breather in place of this one way one in your picture (up higher at the end of a hose), is what eliminates a vacuum that would cause water to get it. Why does Toyota do this on the front diff., if not true? (of course, why don't they do it on the rear??!!)

How much pressure do you think you generate by blowing in something? You cant move a gauge 1 psi. Yes, I have tried. Regardless, water DOES get in thru it. On every vehicle you drive in the water, it WILL get water in the diff.
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Old 11-14-2011, 02:35 PM   #22
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Quote:
Originally Posted by 98tacoma27 View Post
If that would keep water out, then the diff breather relocate mod is a waste

Water is not getting in through the factory breather... Relocating is only a waste if you put the same one way breather on the end of the tube... You must use the same breather that Toyota uses on the front (or a filter)... to allow 2 way air movement.

The purpose of the different breather, re-located, is to break the vacuum so water doesn't suck into the diff. past the axle seals.
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Old 11-14-2011, 02:36 PM   #23
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Quote:
Originally Posted by chris4x4 View Post
How much pressure do you think you generate by blowing in something? You cant move a gauge 1 psi. Yes, I have tried. Regardless, water DOES get in thru it. On every vehicle you drive in the water, it WILL get water in the diff.
Yes, but past the axles...
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Old 11-14-2011, 02:39 PM   #24
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by David K View Post
Yes, but past the axles...
Nope. Try again.
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Old 11-14-2011, 02:41 PM   #25
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Does the diff breather mod improve ATRAC?

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Old 11-14-2011, 02:41 PM   #26
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Quote:
Originally Posted by nmcqueen280 View Post
well yeah, but if the water gets in in a way that we dont know the fix (ie axle seals) then we should know how it comes in so we can make a fix
As long as the diff can breathe both ways, water will not get in through the axle seals.
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Old 11-14-2011, 02:42 PM   #27
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by nmcqueen280 View Post
alright david. when the diff heats up, air will exit through the breather. that is the reason there is a breather. but youre saying that nothing ever goes in the breather. that means that our diffs would be running around with a complete vacuum, and oil would likely get out the breather. this would also mean that when we pop off the plugs to change the fluid, a huge load of air will go shooting into the diff right when the seal is broken. does that sound right to you?
There can be a slight vacuum after you have been driving, and you stop, let the vehicle cool, then pull the fill plug. However, if the vacuum was left un regulated, then the seals would fail. They are not designed to be presurized.
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Old 11-14-2011, 02:54 PM   #28
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Quote:
Originally Posted by chris4x4 View Post
There can be a slight vacuum after you have been driving, and you stop, let the vehicle cool, then pull the fill plug. However, if the vacuum was left un regulated, then the seals would fail. They are not designed to be presurized.
Good answers above... except whippersnappers...

Air in the Diff. is not pure oxygen... or nitrogen... or just gas... but also water vapor... heating and cooling of air makes water vapor and pressure changes... The spring check valve lets excess expanded gasses/ vapors out... but only to the point that the air pressure inside the diff. is once again EQUAL to the outside air pressure. Any vacuum developed would be tiny and soon erased by new gear oil and other vapors insude.

Just do the mod. and don't worry about the stock breather!
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Old 11-14-2011, 02:55 PM   #29
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Old 11-14-2011, 02:59 PM   #30
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My rear diff brings all the boys to the yard
And they're like, "It's better than yours."
Damn right, it's better than yours!

As for that breather relocation thing, I could teach you...but I'd have to charge.
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Old 11-14-2011, 03:14 PM   #31
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Quote:
Originally Posted by David K View Post
Yes, but past the axles...
If water is getting in, oil is getting out. Plain and simple.
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Old 11-14-2011, 03:18 PM   #32
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Quote:
Originally Posted by David K View Post
Good answers above... except whippersnappers...

Air in the Diff. is not pure oxygen... or nitrogen... or just gas... but also water vapor... heating and cooling of air makes water vapor and pressure changes... The spring check valve lets excess expanded gasses/ vapors out... but only to the point that the air pressure inside the diff. is once again EQUAL to the outside air pressure. Any vacuum developed would be tiny and soon erased by new gear oil and other vapors insude.

Just do the mod. and don't worry about the stock breather!
Why do I have to do the mod if it keeps the water out?

http://www.tacomaworld.com/forum/off...ml#post1854953

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Old 11-14-2011, 03:28 PM   #33
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The stock breather doesn't keep water out of the diff. That is why we do the mod.

The stock breather itself won't let water through it and into the diff. The water is getting in at the axle seals... from a vacuum created when you drive into water.

The mod. will break the vacuum using a 2 way breather up high.
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Old 11-14-2011, 03:30 PM   #34
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Quote:
Originally Posted by David K View Post
The stock breather doesn't keep water out of the diff. That is why we do the mod.

The stock breather itself won't let water through it and into the diff. The water is getting in at the axle seals... from a vacuum created when you drive into water.

The mod. will break the vacuum using a 2 way breather up high.
You have no clue how oil seals work. Once fluid gets by in any direction, they're done.
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Old 11-14-2011, 03:39 PM   #35
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Quote:
Originally Posted by 98tacoma27 View Post
You have no clue how oil seals work. Once fluid gets by in any direction, they're done.

Yes you are right... even though I have had it happen to me, and did the mod later... and what others here have reported...
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Old 11-14-2011, 03:39 PM   #36
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Quote:
Originally Posted by nmcqueen280 View Post

are you drunk?
Drunk on ATRAC.

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Old 11-14-2011, 03:39 PM   #37
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Quote:
Originally Posted by nmcqueen280 View Post

are you drunk?
Not yet.. but try and read all of my words and not just parts out-of-context, like you reposted above
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Old 11-14-2011, 03:55 PM   #38
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by 98tacoma27 View Post
You have no clue how oil seals work. Once fluid gets by in any direction, they're done.
This ^^^
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Old 11-14-2011, 03:58 PM   #39
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Quote:
Originally Posted by nmcqueen280 View Post
what do you mean out of context? there was nothing in between those statements. you said that the breather does not keep water out and then immediately said that it will not let water in.
yeah i know i read the whole post, i read the whole thread. theres plenty of context, that still makes no sense (unless you are blaming the diff breather for the water getting in at the axle seals, in which case sure i guess thats coherent whether i agree or not)
OK... See if this helps:

1) The stock breather only lets expanding gasses out of the diff. by pushing open the spring check valve with more than normao pressure.

2) The rubber and spring keeps the vent closed, otherwise. If underwater, there is even more pressure holding the rubber closed against the opening.

A) When a vacuum exists inside the diff. then outside forces will push into the diff. at the axle seals. If underwater, water can get in there.

B) The 2 way breather, mounted high, breaks the vacuum by being open to normal air pressure.

SO... The stock breather is not letting water in, but it also is not letting air in... a vacuum is created, and contamination enters at the axle seals. It allows water to get in, but not through it.
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Old 11-14-2011, 04:01 PM   #40
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Quote:
Originally Posted by 98tacoma27 View Post
You have no clue how oil seals work. Once fluid gets by in any direction, they're done.
This is why we need to do the mod, to stop fluid from getting in...
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