12B help.

[DirtyComanche]

I finially got back to my 'backburner' project. Which actually, is to fix my 'manche. Anyways...



I've got an Isuzu 12B rear from a 90 trooper. The brake rotors were seized to the axle shafts, so after a quick buzz with the arc they came off with a sledge. Anyways, I figured I better pull the third just to make sure everything is fine. So, I removed the bolts which hold the hub (I guess) to the housing, and pulled the shafts.


Now, I ask, how do you get the shafts off of the hub assembly? I can pull the third, but I want to know how you're supposed to change a shaft.

There's a snap ring on the shaft, and a collar for the seal to ride on. I assume you pull the collar and then there's another snap ring behind it? Is the collar pressed on or are mine just seized? I didn't want to get harsh with it as the seal rides on it.

Also, I wrecked most of the studs/bolts that hold the hub to the housing. It should be find to replace them with a gr8 conventional bolt?

[mlclark]

Let's take a step back before something gets broked good.

Yes, the rotors will stick to the flange. But, it should not have taken a torch to get them off. Maybe some heat, a hammer and did you see that small threaded hole by the wheel studs? Yup, it's there for a reason. Reassemble the new ones with some anti-seize on the back side of the rotor hat.

Now, on to the bearings and seals. Unless the bearing is toast or the outer grease seal is leaking, leave it alone. The semifloating bearing holder has to be pressed off and it is just a PITA. This is truly a don't touch it until it is broken kind of thing. The bearings are big and will take much abuse. I have heard of maybe one axle bearing failure on a 12-bolt. Replace the inner oil seal while the axle is out, though. As for replacing the shaft, it is probably best to carry a JY assembly with the housing/caliper bracket in place.

As for the bolts, you can replace them, but they are rather special, as they have a flat side to their head that locks them into place. It is pretty impossible to get a wrench on the backside once it is all put into the end of the axle tube. I suggest Isuzu replacements. www.stcharlesauto.com

Good Luck,
Michael

[DirtyComanche]

Oh, trust me, those rotors were not coming off. When they failed to yeild to the 8Lb sledge, I knew there wasn't much choice. And that was after heating them as much as I could with my propane torch. The arc was the next best thing I had... Oh, the rotors were toast anyways.



And you see, this is why I stopped and asked. I wanted to know if I could reasonably dissasemble that hub/bearing. Since I can't, I won't. As long as I know it's best to treat it as a unit.


I think there's enough clearance that I can put a bolt through it... I'll try. The reason I don't really want to use the isuzu bolts is that it was the unique way that they keyed them that failed. They rounded off and spun. Oh, and to replace them wouldn't I have to pull the bearing assembly anyways?