Gear Teeth in Diff.
#1
CF Veteran
Thread Starter
Gear Teeth in Diff.
here is my front ring gear. It was installed two years ago. I opened the diff to deal with a seal leak. I see lines in the gear teeth running parallel to the teeth, it is normal? I also found a good deal of very fine sludgy powder in the bottom of the diff, very fine, and stuck to magnet.
Is this gear set up wrong?
#2
CF Veteran
You need to get a dial indicator to determine the amount of play. Then some
https://shop.advanceautoparts.com/p/...B&gclsrc=aw.ds
to see how they are mating.
https://shop.advanceautoparts.com/p/...B&gclsrc=aw.ds
to see how they are mating.
#3
CF Veteran
And a little more history. What brand of gears? Who did the installation? And why-- did the previous diff blow up (consider remnants left behind)?
#4
CF Veteran
Thread Starter
1
Last edited by robsjeep; 03-12-2021 at 12:11 PM.
#5
CF Veteran
In the photo it looks like there's particles all over it. Lines are usually from contaminants. That looks like a lot of wear for just a couple years. Measure the backlash it might be too tight. IIWM I'd pull the carrier and give him a good bath.
#6
CF Veteran
Thread Starter
its all coming out, New axle seals and arb slip ring seals should arrive this weekend, then it comes apart. I have the axle oil leak, and air leak of the arb to fix when I found this. backlash, I think it was about 0.005 or .006 inch, we measured the other day. Certainly was a good deal of fine powder fine sludge in bottom, both on magnet drain plug, and filling up that valley in the casting at bottom near the cover mating edge. It appeared to just stay sludged at the bottom rather than be distributed in the oil. Usually i would expect fine hairs of metal on the magnet, not this fine powdery stuff. weird. And yes the oil was drained and refilled at least 2 or 3 times since it was rebuilt. Never ran low, nor abused. Have manual hubs so this baby is not spinning when on the highway, only when off roading when I decide to lock hubs. Maybe I guesstimate 800/1200 miles of driving with hubs locked. So this diff has low miles despite 2 years of use.
Anyway We will see what the bearings look like, If they are toast, then I will likely decide to regear to 4.56 as I got 33 inch tires. But that means doing rear end work too. I want to travel, wheel, not work on it all the time. oh well, it will be better for it.
I also will do a paint pattern again on it, just to check, I do have photos of the set up pattern to compare with. it that looks good, bearings ok, then I will replace seals, and keeping on eye on it. sound like a good plan?
Anyway We will see what the bearings look like, If they are toast, then I will likely decide to regear to 4.56 as I got 33 inch tires. But that means doing rear end work too. I want to travel, wheel, not work on it all the time. oh well, it will be better for it.
I also will do a paint pattern again on it, just to check, I do have photos of the set up pattern to compare with. it that looks good, bearings ok, then I will replace seals, and keeping on eye on it. sound like a good plan?
Last edited by robsjeep; 03-12-2021 at 08:50 PM.
#7
CF Veteran
I would strongly consider the casing is bent, or one of the axles. IIWM I would get another axle assembly (avoid XJs in front end collisions if possible).
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#8
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Thread Starter
Spoiler
bearings look ok.
still need to pull the arb apart to see if the piston seal is good or not. I need to pin point the air leak. The copper pipe appears fine.
The parallel lines on gear teeth appear to be machining marks, and are high lighted by the black oxide coating on the teeth being worn off the ridges of the machining marks.
here is pattern ran today ...
#9
CF Veteran
Still kinda left with this if you're saying there is -0- wear on the pinion:
Certainly was a good deal of fine powder fine sludge in bottom, both on magnet drain plug, and filling up that valley in the casting at bottom near the cover mating edge. It appeared to just stay sludged at the bottom rather than be distributed in the oil. Usually i would expect fine hairs of metal on the magnet, not this fine powdery stuff. weird. And yes the oil was drained and refilled at least 2 or 3 times since it was rebuilt.
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#10
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Join Date: Mar 2016
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Year: 96
Model: Cherokee (XJ)
Engine: 4.0
I would check the backlash in lots of positions, which probably would show up misalignment or tooth damage
If you use high x magnification and strong light, I expect you may be able to observe whether wear is abnormal or not on the gear teeth
The ARBs are pretty notorious for leaking out the two O-rings on the carrier
If you use high x magnification and strong light, I expect you may be able to observe whether wear is abnormal or not on the gear teeth
The ARBs are pretty notorious for leaking out the two O-rings on the carrier
#11
CF Veteran
Thread Starter
test reveals the air leak is internal to the diff, the bonded seal perhaps, not the slip ring seals. I read that arb had a bad batch of bonded seals around the time I got this one.
#12
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Originally Posted by ARB
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