Differential breather - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 21 Old 03-03-2017, 07:29 PM Thread Starter
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Differential breather

So I'm changing out a pinion seal that was leaking. I took the differential breather off to check and make sure it wasn't clogged. Thankfully, it's in good working order. However, I noticed that the breather is a one-way check valve. It can relieve the pressure out but does not let any vacuum in once the differential and fluid has cooled.

The only way for the vacuum to be released in the rear end assembly is through the seals then. This does not seem like a very good set up for a road race car that gets extremely hot then cools back down to ambient temperature over and over throughout the weekend. Is there possibly a better set up/system for this?


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post #2 of 21 Old 03-03-2017, 08:00 PM
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I'm not sure what kind of check valve your speaking of. Mine only has a little jiggle vent and I don't believe it's vacuum tight or if enough vacuum is created that it would matter. You could always use something like this though.

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post #3 of 21 Old 03-03-2017, 08:16 PM Thread Starter
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If you have the stock breather (which by your explanation it sounds like you do) then it is in fact a one-way valve. It will let air out (pressure) but not air in (vacuum).

And it definitely creates enough pressure to push fluid out on a weekend of track days. If it is pushing fluid out, it means that once it cools there is a vacuum that needs to be filled.

How mush pressure and/or vacuum I have no idea.

The whole purpose of this thread is that perhaps there is enough to cause the pinion/axle seals to leak and possibly go bad much quicker than normal.

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post #4 of 21 Old 03-03-2017, 09:30 PM
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I fabricated a catch can with a breather and used a 90 degree hose barb on the axle housing... the hose going from the axle housing runs "up hill" to the catch can. If any gear oil is vented to the catch can it drains back into the axle housing.
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post #5 of 21 Old 03-03-2017, 09:37 PM
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I think your overthinking it a little, but the sintered breather I posted or one similar will solve that. If your pushing fluid out run a hose to a high point and install the breather. Off road guys do this quite often as the "one way" valve you spoke of lets water in the diff. The vacuum, if any, would only pull past the parts of the seals that weren't submerged under the fluid so the pressure would be more likely to cause the leaks.
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post #6 of 21 Old 03-04-2017, 05:09 AM Thread Starter
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Quote:
Originally Posted by ChristophrC View Post
I fabricated a catch can with a breather and used a 90 degree hose barb on the axle housing... the hose going from the axle housing runs "up hill" to the catch can. If any gear oil is vented to the catch can it drains back into the axle housing.
Possibly have any pics? Do you know what size thread the hose barb is that screws into the axle?

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post #7 of 21 Old 03-04-2017, 08:14 AM
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https://ibb.co/bUVR5a

https://ibb.co/fTwzQa

I hope those pics work...

IIRC the fitting size on the axle tube is 1/8 npt. Whatever it is the fitting was a little loose. I put Permatex high torque rtv around the fitting before I screwed the fitting into the axle tube. So far, so good...
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post #8 of 21 Old 03-04-2017, 08:16 AM
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pic posted below

Last edited by ChristophrC; 03-04-2017 at 11:26 AM. Reason: pics
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post #9 of 21 Old 03-04-2017, 08:19 AM
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pic posted below

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Last edited by ChristophrC; 03-04-2017 at 11:25 AM. Reason: posted pic
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post #10 of 21 Old 03-04-2017, 09:16 AM Thread Starter
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That looks good. I'm trying to find something similar.


91 Road Racing Fox. N/A 383W. Full MM setup front and rear with Bilstein coil-overs. 14x1.25 Wilwood 6 piston fronts with Wilwood 13x1 single piston rears.
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post #11 of 21 Old 03-04-2017, 11:24 AM
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Finally got a pic to show up...

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NMCA/Pro M/S 10011
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post #12 of 21 Old 03-04-2017, 01:55 PM
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Here is a catch can/breather by Full tilt boogie for a irs:
FT 1382
It will work the same for any differential set up though.

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post #13 of 21 Old 03-04-2017, 04:20 PM Thread Starter
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Finally got a pic to show up...

What's the brand of that reservoir?

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post #14 of 21 Old 03-04-2017, 04:44 PM
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What's the brand of that reservoir?
No particular brand... it is just something I put together. It is actually PVC from Home Depot. I used two pieces that had bosses on them for 1/4 npt thread IIRC, a coupler, some caps, a few fittings and a breather from Advance Auto. It is filled with stainless mesh that I picked up at the grocery store. I probably have $20 in the entire project... I also did something similar for my t5 transmission... it kept blowing fluid up through the shifter so I removed the tailhousing and and drilled and tapped the vent hole for a fitting. I ran a -8 line up the catch in the engine bay... I will try to post up a pic...

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post #15 of 21 Old 03-04-2017, 05:04 PM
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pics of transmission catch can...




NMCA/Pro M/S 10011
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post #16 of 21 Old 04-08-2017, 10:59 PM
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Quote:
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Finally got a pic to show up...

Great job and thanks for the inspiration!

IMG_20170408_223542.jpg
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post #17 of 21 Old 04-09-2017, 12:21 PM
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Is that an optical illusion or is that close to the tailpipe?
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post #18 of 21 Old 04-09-2017, 01:17 PM
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Is that an optical illusion or is that close to the tailpipe?
It's an optical illusion. It's about 1.5" away at the closest point. The rubber is fuel hose from advanced auto. Do you think that is a concern for heat? I was hoping to use the clear tubing for the whole thing. It's rated at 500F but it kinks to easily.

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post #19 of 21 Old 04-09-2017, 06:24 PM
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Quote:
Originally Posted by LT1HAHA View Post
If you have the stock breather (which by your explanation it sounds like you do) then it is in fact a one-way valve. It will let air out (pressure) but not air in (vacuum).

And it definitely creates enough pressure to push fluid out on a weekend of track days. If it is pushing fluid out, it means that once it cools there is a vacuum that needs to be filled.

How mush pressure and/or vacuum I have no idea.

The whole purpose of this thread is that perhaps there is enough to cause the pinion/axle seals to leak and possibly go bad much quicker than normal.
If there is a vacuum in the rear differential, it would be impossible for oil to leak out. With a lower pressure inside the diff, air would be trying to get in, thus preventing oil from leaking out. Simple physics. This is one of the reasons why I run a vacuum pump on my engine...no oil leaks!

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post #20 of 21 Old 04-09-2017, 09:34 PM
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Quote:
Originally Posted by nathan67stang View Post
It's an optical illusion. It's about 1.5" away at the closest point. The rubber is fuel hose from advanced auto. Do you think that is a concern for heat? I was hoping to use the clear tubing for the whole thing. It's rated at 500F but it kinks to easily.
1.5" is probably ok...if it were my car, I would just keep an eye on it...I don't believe the tailpipes are over 500F that far down the system
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post #21 of 21 Old 04-10-2017, 07:41 PM
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Originally Posted by mlanoux View Post
1.5" is probably ok...if it were my car, I would just keep an eye on it...I don't believe the tailpipes are over 500F that far down the system
Yeah I didn't think so either lol. From what I can find, that parts store fuel hose is only rated for like 125-150F. If my diff fluid is venting out into the hose I figure it will be hotter than that. I may try to get some rubber line that is for higher temps.

1994 Mustang Cobra #662,347 Stroker,AFR Heads,Trickflow Intake,Anderson Cam,LT Headers,Flowmaster
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