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Cracked Bearing Race

Jawa

Jawa

NAXJA Forum User
Location
Aurora, CO
So I'm working with my father-in-law to install a Lock Right locker in my front D30 and everything is moving along smoothly. Then we encounter this:

IMG_2523.jpg


...and the show's over just like that. We can't very well finish with a cracked bearing race. We're pretty sure the carrier bearings need to be replaced along with the races. Does anyone know if we need to worry about adjusting backlash and all that other stuff once the bearings are replaced or should we be able to have new bearings pressed in and then just finish the locker install? I'm trying to guage whether I'll need a specialist to get involved. Thank you!
 
From the looks of that race,Id be concerned about all the bearings/races and the gears also.
 
you need to use a dead blow hammer to reinstall the carrier. A hammer (ball peen or otherwise) will do that everytime.

If this was done on reinstall (as I suspect it was), changing the race will suffice for say 70,000 miles. If it was like this on disassembly (unlikely) you need to change both carrier bearings and reset the preload for the new bearings.
Not too hard, Pull the old bearings, measure the shims, add .001 to .003 additional for the new bearings, press on new bearings and reinstall.

Never hit the race or the shims (thick shims on an outside shim setup) with a hammer.
 
blaisetd said:
Got a pic of the bearings?
Click to expand...

This is about as good as I've got. The bearings look decent at first, but close inspection shows some damage to some of the individual rollers (probably not the right term, but I think you'll get what I'm referring to). The damaged rollers have areas that look pitted, kinda like the surface of an orange.

IMG_2526.jpg
 
i had my carrier out last summer and i just pulled it out and put it back in with my hands, but everything i've read says you'll prolly need a prybar to get it out and a dead blow to get it back in... i mean mine was tight but i'm no hercules... good luck with fixing that though. i wish i had words of wisdom to offer. i'm learning on this one too.
 
DaffyXJ said:
you need to use a dead blow hammer to reinstall the carrier. A hammer (ball peen or otherwise) will do that everytime..
Click to expand...

I can assure you that no part of the diff was hit with a hammer of any kind.

DaffyXJ said:
If this was done on reinstall (as I suspect it was), changing the race will suffice for say 70,000 miles. If it was like this on disassembly (unlikely) you need to change both carrier bearings and reset the preload for the new bearings.
Not too hard, Pull the old bearings, measure the shims, add .001 to .003 additional for the new bearings, press on new bearings and reinstall.
Click to expand...

Actually, this was discovered on disassembly. I have been dealing with some vibrations for several weeks that I had attributed to bad wheel bearings, driveline angles, or an out of balance driveshaft, but now I think I've found my problem. My XJ is a '99 and I've seen a few posts on here about lots of other '99 owners saying their carrier bearings went bad.

I've got a mechanic who knows differentials that's going to swap out both carrier bearings. From your description it sounds like once I get the diff back from him I should be able to pick up the locker install from where I left off. Let me know if I've got that wrong.

DaffyXJ said:
Never hit the race or the shims (thick shims on an outside shim setup) with a hammer.
Click to expand...

Roger that.
 
You should be able to replace the bearing (you should replace the race AND the bearing) without worrying about resetting the preload......a new bearing will be tighter before it wears in some besides, alot of installers will hone out the old bearings to use as "set up" bearings........you should be okay. I would look closely at the the gear teeth for any damage, though.---------Hans
 
Oatmeal said:
You should be able to replace the bearing (you should replace the race AND the bearing) without worrying about resetting the preload......a new bearing will be tighter before it wears in some besides, alot of installers will hone out the old bearings to use as "set up" bearings........you should be okay. I would look closely at the the gear teeth for any damage, though.---------Hans
Click to expand...
We inspected the ring gear under a magnifying lens and couldn't find any damage. The spider gears will be replaced with the Lock Right, so I'm hoping new bearings and races will be all I need to worry about. Thank you.
 
jawa2021 said:
My XJ is a '99 and I've seen a few posts on here about lots of other '99 owners saying their carrier bearings went bad.
Click to expand...

Somewhat related - is it HP or LP d30? on another forum there was speculation as to whethere or not the LP was only 00 and 01 or if there were some (or all 99's) had it. HP 30's are considered stronger because the gears are reverse cut and better because they have more clearance, but i'd bet they have the same bearings. anyone know for sure?
 
jawa2021 said:
My '99 is HP. I can't comment on whether or not it uses the same gears as a LP though.
Click to expand...
It does not use the same gears,but I would be worried about the condition of the pinion bearings also.What you have looks really bad!
 
asp387 said:
Somewhat related - is it HP or LP d30? on another forum there was speculation as to whethere or not the LP was only 00 and 01 or if there were some (or all 99's) had it. HP 30's are considered stronger because the gears are reverse cut and better because they have more clearance, but i'd bet they have the same bearings. anyone know for sure?
Click to expand...

yep.
 
i'm not a master axle mechanic, but if the ring gear is fine, why would the pinion be messed up? you never hear of teeth breaking off the pinion. more than happy to be proved wrong.
 
blaisetd said:
No. If you remove the pinion you will have to redo the pinion preload.
Click to expand...
Does the D30 use a crush sleeve :dunno: If it does, it's no big deal, check the preload (breakaway torque) before loosening up the pinion nut and record it. When you tighten it up (with a new crush sleeve) go just enough to achieve the same preload.....of course you'll need an inch pound torque wrench. If it dosen't, it's even easier.......just tighten it back up;)-----------Hans
 
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