rear diff flange seal

[landtank]

Wife spotted an oil leak under the Tank. So after checking it out I replaced the speed sensor O-ring. While under there I noticed some gear oil coming out of the rear diif at the flange. Can this be repaired by just removing the flange and swapping the seal?

 

[landtoy80]

Yes. You need to get the back lash set so READ THE FSM before you do it.

Put a little FIPG(red) a round the seal. That way you wont get a leak from the lip of the seal.

If your flange is groved, you may need new one.

 

[landtoy80]

Also check your breather, it may be plugged.

 

[landtank]

I did read the fsm, it looked to me that I could take it apart and then just reset the preload of the pinion bearing. Looks to me that the backlash is set prior to installing the flange. Just wanted to confirm this with someone who might have done this already.

 

[landtoy80]

What you are need to read is the resistance of the pinion within the backlash. That is ,with the wheel on the ground, turn the flange. It turns a little. What you are measuring is how hard the pinion turns within the slop of the ring gear.

You can reuse the nut (if you don't destroy it) this way the nut should be in the same spot when you have the torque set right.

You will need a inch/lb dial torque guage. You measure the torque before you remove the nut. Then add several (don't remember the amount of inch/lbs) when you put the nut on and tighten it down.
You need a ft/bls torque guage to measure how much you torque the nut too. If you go over the spec. lbs while trying to get the correct resistance between the backsash, you will need to replace the crush sleeve, BIG JOB.

If you are lucky, you will just tighten the nut to where it was when you removed it.

 

[landtank]

Thanks Kurt, I re-read the FSM and with your post I understand what I've got to do.

 

[landtoy80]

I think the reason you are measuring the torque within the backlash is because if you tried to measure backlash with the tires,wheels, brakes, axles and bearings all on, you would not get a accurate reading as all those parts add resistance when turning the pinion.
If you brakes are hanging up or wheel bearings are worn, they would change the reading of the backlash when you turn the pinion.

 

[landtank]

I crawled under there last weekend to top off the fluid if need be and checked the valve on the breather. Even though it was fine last year it was clogged. So I put a lawmower fuel filter in it's place to try and keep out debrise. Last week I drove just over 400 miles with no oil leaking so looks like the breather mod is due.

I checked the tech links and found a couple but thought there was a more indepth instruction sheet around. Can anyone help?

 

[landtoy80]

If your breather is/was plugged, then you may want to check and repack the rear wheel bearings.
If there was enough pressure to blow out the pinion seal, it should of blown out the wheel seals too.

I haven't done the rear but the front I just ran it up to the master cylinder and put a filter on the hose.

I don't know where others have ran the rear breather but if the hose is too long, could there be a problem with removing moister from the diff?

 

[Beowulf]

I checked the tech links and found a couple but thought there was a more indepth instruction sheet around. Can anyone help?

Here ya go Rick.

https://forum.ih8mud.com/showthread.php?p=10093#post10093

-B-

 

[e9999]

Here ya go Rick.

https://forum.ih8mud.com/showthread.php?p=10093#post10093

-B-

how d'ya do that, BW? Most other links are not working...

E

 

[LandCruiserPhil]

I have replaced the pinion seal on several personal vehicles without replacing the crush sleeve with no problem. Nothing should change on your pinion setting if you just replace the seal. The hard part of replacing the seal is getting the nut up to torque correctly.

Phil

 

[landtank]

I was thinking about looking at the idea of instead of ending the breather tubing in the engine compartment, removing a snorkle stud and maybe threading a nipple into it so it would breath through the snorkle.

What do you guys think of this?


And thanks -B-

 

[landtoy80]

If you do make that long of a hose from the back to the front, use clear hose and make a bend like a sink trap. That way if you have condensation it will get stuck in the trap and you will be able to see it.

When my breather was plugged, I would remove the hose and several eyedroppers full of water in my face. The nipple on the diff, is were it plugs up. I now celan it with a pipe cleaner every so often. I was amzed how water could get in the hose when the nipple was plugged.