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My Differential Breather Mod Photos

Discussion in 'Technical Chat' started by David K, Sep 5, 2010.

  1. Jun 9, 2013 at 6:53 PM
    #321
    Agent Smith

    Agent Smith Always outnumbered, never outgunned

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    Did this mod just now. For those wondering like I did, the stock breather threading is the same length as the new union you are replacing it with. It can be tightened all the way down to the differential housing. I was wondering why I saw about 1/4 of the threads on the earlier pics, thinking that it was longer and intruding into the gear area. It's not. +1 Rep for OP!
     
  2. Jun 10, 2013 at 4:34 PM
    #322
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    Did I do something right?!! LOL

    Thank you! You will also note that I wrapped teflon tape on the threads so it would seal without over-tightening and risk of snapping it off!:cool:
     
  3. Jun 10, 2013 at 4:47 PM
    #323
    DoorDing

    DoorDing Intentionally obtuse

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    Completed using David K's part numbers from OP. I ran the hose between the bed structure and zip tied it to the fuel filler tube. No need for the extension for the Fremont last week (5"), but it's good to know it's done.

    Thanks again, David. :wave:
     
  4. Jun 12, 2013 at 1:09 AM
    #324
    David K

    David K [OP] Well-Known Member

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    de nada amigo!
     
  5. Jun 22, 2013 at 2:23 PM
    #325
    Pearcem87

    Pearcem87 Well-Known Member

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    Just finished this mod, routed my breather through my bed cubby. The actual replacement breather valve I got doesn't have much articulation in the little silver cap over the valve, unlike the stock one from the axle, which moves around a lot. There is not a seal or anything, and it will freely spin, but there is not much of a gap. Anything to be concerned about? first time doing a breather relocation with this type of valve. Thanks
     
  6. Jun 22, 2013 at 2:30 PM
    #326
    DoorDing

    DoorDing Intentionally obtuse

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    If you blow through the original part from the axle, you'll see that the movement is actually the valve at work. Push it in, and the air flow is stopped. The new part doesn't act as a valve, so there's no movement.
     
  7. Jun 25, 2013 at 6:21 PM
    #327
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    That is the whole point of doing this mod... to put a real breather on the end of a tube, above any deep water line.

    The thing that is on the differential from the factory is a one way VENT... It has a spring loaded seal that takes a pressure build-up in the diff. to push against the little spring, and let gasses vent to atmosphere.

    A BREATHER allows venting AND vacuum breaking! That's the key, to break a vacuum created inside the diff., when you cross a stream... The sudden cooling of a hot differential makes the outside air/ muddy water want to suck INTO the differential, passing the rubber axle seals.

    Yes, it happens... either how I explained or or another way, the differential oil gets contaminated.

    Why does Toyota put a remote breather on the front differential, but not on the rear? Specially on OFF ROAD or 4WD Tacomas...??!!

    This mod put the same breather Toyota has on our front differentials, on the rear... and up high in the bed compartment or the gas fill bay, etc.

    Didn't I cover all this in the first page of this thread? No problem, I like talking about my Tacoma... Hope that explains it, but don't hold back if you have questions!
     
  8. Jun 25, 2013 at 7:18 PM
    #328
    Frogsauce

    Frogsauce Well-Known Member

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    Hey David, the two breathers that are right next to the battery on an '09 off-road are the Transmission and Front Diff breathers? Or are they something else...

    I'm try to find ALL the breathers on the truck similar to this:

    http://www.tacomaworld.com/forum/off-roading-trails/15093-scuba-mod-relocating-front-rear-diff-tranny-transfer-case-e-locker-breather.html

    But I think two of them are already relocated. Either way, I am running all of them into these instead:

    Specter Breather

    Then I will partially cover those to protect from splash off the fan if it catches water.

    Does that sound sane?


    EDIT: I am running all of them to the driver side front up to a custom bracket I made. Will post pics if this all works out.
     
    Last edited: Jun 25, 2013
  9. Jun 26, 2013 at 8:19 AM
    #329
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    Yes, front diff breather is one of the two by the battery... and your breather choice looks good to me!
     
  10. Jun 26, 2013 at 8:35 AM
    #330
    Frogsauce

    Frogsauce Well-Known Member

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    What's the other one? :confused:

    I'm going to start it this Friday since I am off. Hopefully, everything turns out nice.
     
  11. Aug 20, 2013 at 9:52 PM
    #331
    David K

    David K [OP] Well-Known Member

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    See this photo, lower red square, by frogsauce:

    [​IMG]
     
  12. Aug 21, 2013 at 8:25 AM
    #332
    David K

    David K [OP] Well-Known Member

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    FYI: ADD = Automatic Disconnecting Differential. Like 'automatic hubs', but no need to drive in reverse to complete the unlocking. Permits shift-on-the-fly into and out of 4WD-HI, from inside your vehicle, stopped or moving.

    Before the ADD or AUTO HUBS, one had to get out and rotate the hubs from free to lock to use 4WD. Before hubs (old 4WDs), the front driveline rotated even in 2WD.
     
  13. Aug 21, 2013 at 4:03 PM
    #333
    DoorDing

    DoorDing Intentionally obtuse

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    I understand that the ADD disconnects the front axles from the transfer case, but aren't the CV axles splined to the front hubs, meaning they're still rotating in 2WD?
     
  14. Aug 21, 2013 at 4:13 PM
    #334
    David K

    David K [OP] Well-Known Member

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    I welcome Toyota Tech input... The whole idea of Auto Hubs, the ADD and Selectable Hubs in general is to reduce wear on the front driveline and increase fuel economy. Is one of the two half axles spinning with one of the two front tires, or are both not connected?
     
  15. Aug 21, 2013 at 4:18 PM
    #335
    DoorDing

    DoorDing Intentionally obtuse

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    I don't have time right now, but if we don't get an answer, I'll lift the front later and see what spins in 2WD.
     
  16. Aug 21, 2013 at 4:32 PM
    #336
    David K

    David K [OP] Well-Known Member

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    I hope nothing! The spinning would come from the front tires rolling since the transfer case is in 2WD.

    If someone could mount one of those web cams under the truck and drive in 2WD, we can see if either front half axle or front drive shaft rotates with the tires or just a little from centrifugal force... ???
     
  17. Sep 18, 2013 at 5:45 AM
    #337
    Frogsauce

    Frogsauce Well-Known Member

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  18. Sep 28, 2013 at 12:09 AM
    #338
    David K

    David K [OP] Well-Known Member

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  19. Oct 4, 2013 at 9:38 AM
    #339
    gonathan85

    gonathan85 Well-Known Member

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    Mod completed! For those of you who elected to locate the new breather in the gas cap compartment, did you have trouble drilling a hole for the hose to protrude through? I chose the rubber grommet method, and it came out clean.

    Drilling a 5/8" hole at a funny angle (due to gas door) in the plastic was somewhat precarious. I started with a 1/4" bit, after using an electrical tester to create a pilot "dimple" in the plastic. Then, I progressively stepped-up the bit size 4 more times with 4 slightly larger bits to eventually end up with a 5/8" hole. I used a 31/32 x 1/2 rubber grommet purchased at Lowes #139377 to give a clean factory finish. Also used a 1/4" to 5/8" #4 SS clamp to secure the 5/16 ID fuel line to the threaded barb fitting. :thumbsup:

    [​IMG]

    [​IMG]

    [​IMG]
     
  20. Dec 26, 2013 at 9:26 PM
    #340
    totmacher

    totmacher Well-Known Member

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    Just FYI, that yellow high pressure hose on pg 1, 3/8 in x 5/8 out, is clearance item at Lowes now. I think it was $0.66 per foot when I got it today.

    They had some red air line hose that I assume would work too if you just don't like yellow.
     
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