1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Leaking Rear diff?

Discussion in '80-Series Tech' started by livelarg, Jul 17, 2005.

  1. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    I just got back from a long trip and I am slinging soem sort of lubricant from the rear of the truck. My tranny fluid is the same as the beginning and so is the oil. Plus there is not much mess in front of the rear diff.
    So I am thinking the rear differential. Is this a common leak and what do i need to fix it? Do the gaskets go out on these things much?
    I need to fix this leak soon, there is a lot of juice falling out.

    Thanks
    Kent
     
  2. flintknapper

    flintknapper

    Messages:
    4,453
    Likes Received:
    1,382
    Joined:
    May 22, 2004
    Location:
    Deep East Texas

    Kent, can you give a little more info on you Cruiser. Year model, mileage, etc..

    I am not aware of any real problems with dff. gaskets (3rd member to housing) but pinion seals can leak and cause a mess. A photo would be handy, or you could thoroughly clean the area and then look again in a day or so to see if you narrow it down.
     
  3. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    Sorry, I guese that whould be helpfull.
    It is 91' cruiser with 220K miles on it. I just bought it about 2 months ago. The guy that owned it before me did not take the best care of it.
    I did clean it off once, and it did not seem to be leaking, but on this last drive, it seems to be slinging fluid all over the area around the rear diff.
    My current plan is to clean it off again then drive for a few miles to see where it is leaking from.

    Thanks
    Kent
     
    Last edited: Jul 17, 2005
  4. loquito

    loquito

    Messages:
    838
    Likes Received:
    4
    Joined:
    Aug 6, 2004
    I too would look at the seal for the pinnion. Mine was leaking there and would run down the pumpkin and drip on my driveway. Cheap fix if that is the cause.
     
  5. flintknapper

    flintknapper

    Messages:
    4,453
    Likes Received:
    1,382
    Joined:
    May 22, 2004
    Location:
    Deep East Texas
    Kent, what makes me think it is a pinion seal is the fact that lube is being thrown all about. This suggests a leak at a rotating part (namely the pinion gear/shaft), and then the yoke is slinging it all over.

    If it were a gasket at the third member you wouldn't see the kind of mess you're describing. It would be "wind blown" around the housing but thats about it.

    Good luck.
     
  6. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    Cool, thanks for the info.
    I am not sure what you are meaning with the pinion seal. you say it is a cheap fix, any where I can find info on how to do it?

    Thanks
    Kent
     
  7. flintknapper

    flintknapper

    Messages:
    4,453
    Likes Received:
    1,382
    Joined:
    May 22, 2004
    Location:
    Deep East Texas

    I didn't say it was a cheap fix (although it can be). The seal itself is inexpensive.. but if you have to pay someone to do the job it could run into a litte money.

    The seal resides behind the companion flange and underneath a dust cover. It can be removed on the vehicle but care must be taken when retorquing the flange nut so as NOT to change the pinion preload.

    Also, its possible that the pinion shaft has a groove in it. This can happen when a seal starts to fail and dirt/dust etc....get into that area and wear a small groove in the sealing surface.

    Eventually, even a new seal will leak again if this isn't taken care of... (redi-sleeve).

    So....the gist of is: You can buy a seal and do it yourself (after having read how in the FSM) or, you can pay a shop to fix it.

    One stumbling block might be the torque figure on the companion nut. I don't have my manual in front of me...but I'll bet its way on up there. (anybody know)
     
  8. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    thanks, but what is the FSM?
     
  9. dekuiper

    dekuiper

    Messages:
    262
    Likes Received:
    0
    Joined:
    Mar 10, 2004
    I replaced my rear pinnion seal a few months ago. The part was less than $7 at Advanced Auto. I used a friends lift and it was quite easy.

    FSM=Factory Service Manual
     
  10. loquito

    loquito

    Messages:
    838
    Likes Received:
    4
    Joined:
    Aug 6, 2004
    IIRC the final torque was 180#
    So you need access to a footpound torque wrench that goes at least to 180#
    as well as an inch pound torque wrench to determin preload before you remove the pinnion nut.
    There is alot of info I found when I fixed mine, try searching for Pinnion, Companion flange, leaking pinion, You should be able to find some good info.

    If the oil is coming out at the end of the pinnion from under the nut, or is comming out from between your companion flange and the pinnion housing then you might look at you companion flange seal a little closer.
     
  11. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    Thanks for all of the info, I am about to get on this thing tomarrow.

    Thanks
    Kent
     
  12. powderpig

    powderpig SILVER Star

    Messages:
    1,017
    Likes Received:
    16
    Joined:
    Jul 12, 2005
    Location:
    Boulder Foothills, CO
    If you have not done this before, it would be a wise choice to have help. you can put too much preload on the bearing and it can fail(if it has not already). Typically the 180# is for the new install on new bearing with a new crush sleeve. That is why you need the second inch # torque wrench. to measure the bearing preload. If the bearing is not too loose you usually can tighten the nut a little past the old stake point on the nut, if the bearing moves smoothly and does not bind. Try to adjust bearing preload with the axles in the houseing is somewhat difficult to get right, that is why I say it might be good to have help form some one that can help you. Or find a good toyota truck/crusier shop to do. Should be about what ever the minumum labor rate a shop has or no more than a 1 time and the seal cost with maybe a fluid drain and fill if it has not been done in a while. good luck robbie
     
  13. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    Anyone know of a link to somewhere that has a step by step instructions.

    Now to end with a dumb question...
    What kind of fluid do I refill with, and where does it go?

    Thanks
    Kent
     
    Last edited: Jul 25, 2005
  14. lovetoski

    lovetoski SILVER Star

    Messages:
    4,537
    Likes Received:
    214
    Joined:
    Jul 13, 2003
    You refill it with gear oil. Check owners manual for type. 80/90 or 75/90 if I remember correctly. There are lots of opinions as to type of gear oil. Do a search on here (including the FAQ up top) for more info.

    There is a drain and a fill plug on the back of the pumpkin. Drain is on the bottom (facing the ground) and fill is up near the top. It's critical that you remove the fill plug first. They can sieze in place, and you don't want to find that out after you've drained the oil out!
     
  15. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    I did a search onb the pinnion and compantion flanges, didn't get more usefull info on how to do it tho'
    I really need to get the FSM.

    Thanks
     
  16. Land Speeder

    Land Speeder InstaH8R

    Messages:
    11,954
    Media:
    4
    Albums:
    1
    Likes Received:
    965
    Joined:
    Jul 23, 2004
    Location:
    Valley of the Heroes
    Yes, you do. Although, I've found in some diagrams, it's inaccurate as it shows older parts from the FJ62, since they have the same engine and trans. Don't believe me 91 owners? check the brake fluid resevoir diagram.
    But still... the FSM is invaluable and a must have if you intend on even changing your differential fluid.

    Now... per your signature, how did you "body" lift you truck?
     
  17. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY
    The body lift was done before I got it. It was done using aluminum pucks for the lift. It looks like it is a professional kit. The guy did a good job tho' Everything works perfect and it rides like stock.

    Here are a couple of pics of the truck and the lift. Had to throw in a pic of both my rides
    :D

    The cruiser is running 32x11.5
    DSC00243.jpg DSC00245.jpg DSC00244.jpg
     
  18. livelarg

    livelarg

    Messages:
    322
    Media:
    22
    Albums:
    1
    Likes Received:
    32
    Joined:
    May 11, 2005
    Location:
    OKLAHOMA cITY


    Cool! I hope you like yours as much as we like ours! :D
     
  19. bdeakin

    bdeakin

    Messages:
    28
    Likes Received:
    0
    Joined:
    Feb 1, 2005
    Back on the rear diff leak thought...

    I just got back in from looking at my '94 80's rear diff (sans lockers). It's got a gentle leak out the front, which makes me believe it might be the pinion seal. It also seems to make a bit of (quiet) whine on the freeway. Any thoughts on the sound?

    (Apologies for the semi-hijack)

    -Brandt
     
  20. Land Speeder

    Land Speeder InstaH8R

    Messages:
    11,954
    Media:
    4
    Albums:
    1
    Likes Received:
    965
    Joined:
    Jul 23, 2004
    Location:
    Valley of the Heroes
    I need to replace my front dif pinion seal now as it is now puking dif oil... I guess my 91 is feeling sympathetic for the look'a'like

    The FSM has, count'em, 6 SST just to get down to the outer race and then all back on!
    So what is truly needed to replace the seal only if I stop there?
    What would suffice for a companion flange puller? And then what removes the seal? Both of those steps have crazy looking SST's, and I ain't gott'em.