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

How are the front birfield/axle lubed?

Discussion in '40- & 55-Series Tech' started by Iron_Pig, Nov 9, 2003.

  1. Iron_Pig

    Iron_Pig

    Messages:
    116
    Likes Received:
    0
    Joined:
    Dec 4, 2002
    I just got off of nightshift so I'll try to make sense. I just changed all the fluids in my '78 FJ40. It's my understanding that there are seals in the differential. So what fluid lubes the birfield/axle? There must be something because I have some seepage around the trunion felt. There is also a fill plug above each trunion. ( I assume that's what they are). So what lube is added,how much and how do you drain/check it. Stupid question? ???
     
  2. cruiserka

    cruiserka

    Messages:
    44
    Likes Received:
    0
    Joined:
    Nov 9, 2003
    I remember having an 84 hilux 4x4 and I put grease into the knuckles by taking out those square bolts.
     
  3. Trevor

    Trevor

    Messages:
    883
    Albums:
    1
    Likes Received:
    1
    Joined:
    Mar 11, 2002
    There are no stupid questions, only stupid answers. Here's my stupid answer:

    Gear oil keeps the ring and pinion lubed. The entire axle housing is filled with this. Where the housing stops, and the knuckle begins (where the Birfield is located), there are axle seals that prevent the oil from leaking into the knuckle. The knuckle and wheel bearings are filled with grease. Usually these seals leak oil into the grease and you get that slimy mess on the outside of the felt.

    To empty the knuckles, you need to disassemble the whole thing and pull out all the old grease and replace the axle seals. This is a messy job, but not too difficult. See Morgan's webpage for more info on this. Even if it doesn't need a rebuild, the manual recommends squirting some grease into those fill plugs every once-in-a-while. I believe you should use moly-fortified grease in the knuckles.
     
  4. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    12
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    Check your front diff fluid as well, most often if there has been oil seepage into the knuckle, there is grease in the gear oil, and often you can tell the extent of oil-grease transfer by how much grease is in your gear oil.
     
  5. 89GASHOG

    89GASHOG

    Messages:
    3,377
    Likes Received:
    463
    Joined:
    Oct 22, 2003
    Location:
    The Last Frontier
    The knuckles are supposed to be lubed as often as the rest of the chassis, BTW. It's not clear to me how much grease is supposed to be pumped in there. Guess it's to overflow. When I got my 89FJ62 recently, I pumped alot of grease into both sides without seeing any signs of overflow. Gear oil leaking into the knuckles is nothing to ignore. I had that problem on my '85 4runner and the oil eventually found its way onto the brakes.
     
  6. Degnol

    Degnol

    Messages:
    8,121
    Media:
    16
    Albums:
    1
    Likes Received:
    12
    Joined:
    Jan 22, 2003
    Location:
    Kansastitty
    Factory specs call for lithium grease. I got a needle attachment for my grease gun and pumped them all but full. You need to leave room for expansion when everything heats up. The lithium grease is more water resistant. :)
    Ed Long
     
  7. Iron_Pig

    Iron_Pig

    Messages:
    116
    Likes Received:
    0
    Joined:
    Dec 4, 2002
    Thanks again guys :beer: :beer: :beer: