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Milk shake diff fluid?

Discussion in 'Technical Chat' started by Malcolm3.4, Nov 13, 2011.

  1. Nov 13, 2011 at 3:36 PM
    #1
    Malcolm3.4

    Malcolm3.4 [OP] Well-Known Member

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    I replaced all my fluids today and was greeted by a milky brown discharge coming from my rear diff.[​IMG][/IMG] Thinking some water got in thru the breather. Ideas? All the good looking diff fluid in the pan is from the front diff and transfer case. Guess it might be time to do the breather mod.
     
  2. Nov 13, 2011 at 3:36 PM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That would be water or it's aerated. Did you drive it right before you changed it?
     
  3. Nov 13, 2011 at 3:37 PM
    #3
    luk8272

    luk8272 Poodoo

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  4. Nov 13, 2011 at 3:38 PM
    #4
    steve o 77

    steve o 77 braaap

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    I drove mine right before changing the rear diff fluid and it was not aerated like that. Im betting it's water.
     
  5. Nov 13, 2011 at 3:40 PM
    #5
    Dark_Taco

    Dark_Taco ΜΟΛΩΝ ΛΑΒΕ

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    Agreed with above....it's water. Check your axel seals and the previous mentioned diff breather.
     
  6. Nov 13, 2011 at 3:51 PM
    #6
    Malcolm3.4

    Malcolm3.4 [OP] Well-Known Member

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    I was thinking axel seals also. Both drums are dry and the pinion seal area. If water can go in, wouldn't gear fluid be coming out?
     
  7. Nov 13, 2011 at 3:52 PM
    #7
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It can get in through the breather where the oil rarely gets too
     
  8. Nov 13, 2011 at 5:30 PM
    #8
    David K

    David K Well-Known Member

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    How? This is what I understood and discovered...

    The stock breather is a spring loaded, one way (out only) check valve... releases hot expanding gasses only if they build up pressure greated than the force of the spring. The breather is shut closed to the outside, other wise.

    The reason we do the rear breather mod. is to put a true (2 way) breather on the diff., but up high, like it is on the front diff.

    This way, during negative diff. pressure (caused when driving into a stream or puddle deeper than a foot) water won't suck into the diff. past the axle seals.
    This makes the breather dual purpose:
    1) Allow expanding gasses out.
    2) Break the vacuum with fresh air to prevent the siphoning-in of dirty water.
     
  9. Nov 13, 2011 at 5:36 PM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    ..........and you've tested the seal to ensure it, in fact, does keep water out?
     
  10. Nov 13, 2011 at 7:33 PM
    #10
    Janster

    Janster Old & Forgetful

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    It doesn't matter.... It's NOT a completely sealed system & can't be.

    If you've ever looked at one of those breathers...it's a cheap monkey metal looking cap ontop of a plastic thing-a-ma-bob which appears to have springing motion. It only really protects from overspray/rain.

    By the looks of your avatar...you go offroad with your truck. If you sink your diff in water/mud, you're gonna get water inside that breather.

    Everyone who takes their trucks offroad - needs to extend their diff breathers! Cheap & easy insurance to protect your diffs!
     
  11. Nov 14, 2011 at 10:35 AM
    #11
    David K

    David K Well-Known Member

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    When a HOT differential is driven into COOL water...

    The stock breather is really a VENT, that takes some pressure to open the spring loaded check valve... The stock breather does NOT allow anything to get INTO the diff.

    So, the muddy water MUST get into it via another place... and that other place would be the axle and driveshaft seals.

    By using the same breather that Toyota uses on the FRONT, for the REAR (with this mod), we provide a 2 WAY breather, up high... so hot gasses can escape (as before), but also no vacuum can be created to suck water past the axle seals either... since this true breather will let air rush in during the event.
     
  12. Nov 14, 2011 at 10:42 AM
    #12
    JLee

    JLee The Man! Vendor

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    I lost track thousands of dollars ago.

    X2 I did a valve cover filter for my breather in the engine bay No no vacuum can be created in my setup.

    It way like 6 bucks on Ebay
    [​IMG]

    [​IMG]
     
  13. Nov 14, 2011 at 2:14 PM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    [​IMG]

    If you think this will keep water out, you're nuts.
     
  14. Nov 14, 2011 at 2:18 PM
    #14
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Thus causing the air and oil in the diff to cool, and creating a vacuum environment, and when it equalizes, water can get in. There is no magic membrane that allows the pressure to equalize, and not let in contaminants. And if the diff were sealed, then as the pressure increases as it gets hot, the oil would blow past the seals......and leak onto the drums, causing a condition that, when the local neigbor kid runs in front of you, and you apply the brakes to avoid him/her, you would loose control of your truck, hitting a house and bursting into flames. The polutants from the resulting fire would contaminate the atmosphere, throwing the planet into an ice age, or global warming it to the point that everything burns in flames......depending on what theory you subscribe to.



    NOTE: only some things I posted are true. Hint- the global warming/cooling part is false........or is it.....:spy:
     
  15. Nov 14, 2011 at 2:20 PM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    :cool:
     
  16. Nov 14, 2011 at 2:24 PM
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    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    If that would keep water out, then the diff breather relocate mod is a waste
     
  17. Nov 14, 2011 at 2:30 PM
    #17
    David K

    David K Well-Known Member

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    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??!!):eek::rolleyes:
     
  18. Nov 14, 2011 at 2:32 PM
    #18
    steve o 77

    steve o 77 braaap

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    who cares how the water gets in there, all that matters is we all know the fix :thumbsup:
     
  19. Nov 14, 2011 at 2:34 PM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    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.
     
  20. Nov 14, 2011 at 2:35 PM
    #20
    David K

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    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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