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Topic Summary

Posted by: Carls_jeep
« on: February 11, 2014, 10:10:11 AM »

One of my Willys shop manuals said that the clearance on the spider gears should be no more than .006". I assume that is for both the conical and drive gears. I don't know if different thickness shims are available anymore. The only place I found the spider gear shims is Kaiser Willys Jeep Parts. I don't know if there ever were various thickness shims for those locations.

I do know places that I can get shims of all sizes and thicknesses and you can find them by searching for shims.

From the clearances you show in your spider housing I suspect you will need more than shims.
Posted by: Ryan_M
« on: February 10, 2014, 07:01:36 PM »

Quote
There should be shims between the gears that drive the axles and the housing. There is one on each side. There will be four shims in all two conical and two flat. Have you looked in the Willys shop manual at the breakdown photo's. The parts book also has a good layout of the parts. if the housing or gears are worn or grooved where the shims go parts will have to be replaced.

I have no worries taking everything apart and bolting it back together - even with new replacement parts where needed. My concern is with trying to determine the tolerances and how many shims to use in each location. If I knew for sure I could just use the same shims in the same locations the rebuild should be reasonably straightforward. Can I assume that? I'm thinking I probably shouldn't. Is there a reliable reference on how and what to check?
Posted by: Carls_jeep
« on: February 10, 2014, 05:26:49 PM »

There should be shims between the gears that drive the axles and the housing. There is one on each side. There will be four shims in all two conical and two flat. Have you looked in the Willys shop manual at the breakdown photo's. The parts book also has a good layout of the parts. if the housing or gears are worn or grooved where the shims go parts will have to be replaced.
Posted by: ZekeD
« on: February 10, 2014, 11:19:27 AM »

"spider" ;D

Jes havin fun

Zeke
Posted by: Bruce_W
« on: February 09, 2014, 07:43:23 PM »

  It looks to me like there's a lot of wear on the side (bigger) gear teeth, and on the differential pinion (smaller, or "spider") gear teeth too. Due to the tapered shape, as they wear, the pinions can move toward the center. Movement of the side gears may be limited by the pinion shaft (cross pin) or the center axle spacer. It also looks like the spacer has been moving on the pin. The only way that can happen is for the pin to be loose in the case, or the side gears are moving in the case, taking the axles and spacer with them. For this to happen, there must be a lot of wear on the side gears where they ride in the case, and also in the holes in the case where the side gears run. Gravity is taking up the play between the lower pinion and side gears by pulling the side gears toward the pinion.
  There's been a lot of wheel-spin going on here, I'll betcha.

  Now, to avoid confusion, even tho I've tried to use the proper terms, everywhere I've written "pinion", say "spider". :)     BW
Posted by: Ryan_M
« on: February 09, 2014, 03:54:49 PM »

Heck with it. I've pulled it apart. Conical washers were there but something is still amiss. See '51 3A project thread for progress.
Posted by: Ryan_M
« on: February 08, 2014, 09:29:44 PM »

Quote
Do the two larger spider gears have movement inward or outward?

No movement in the larger spider gears or the small bottom one.
Posted by: athawk11
« on: February 08, 2014, 09:19:20 PM »

Ryan,
Do the two larger spider gears have movement inward or outward?  If so, the washers on the back side of the larger gears may be missing, allowing them slip outward and increasing the gap between the smaller spider gears.  I can see the washers on the small gear.  I can't see them on the big gears.

Just a guess really.

Tim
Posted by: Ryan_M
« on: February 08, 2014, 08:54:43 PM »

I didn't really see a metallic cast to the gear oil. If it was there it was very very slight...and trust me, I was looking for one. I actually drove the first 300 miles after my original vehicle overhaul with NO GEAR OIL in the rear diff. I drained it during the tear-down and for whatever reason (distracted by a phone call, probably) it never got topped off. Months later I finished the Jeep and off I went. The front was full, the rear was dry aside from whatever residual stuff was left clinging to the gears. It's a wonder it didn't weld it self together and grenade.

Posted by: F Bill
« on: February 08, 2014, 08:45:15 PM »

Was there a metallic cast to the gear lube when you drained the axle?

It almost looks as if someone left out a thrust washer when they assembled it. I think but am not certain you can remove the spider gears without removing the carrier....might be worth a better look. Centrifugal force will push the gears into a better mesh as the axle gets up to speed. I don't like the way they mesh when still.
Posted by: Ryan_M
« on: February 08, 2014, 08:36:57 PM »

Tough to get good pics in there. You can see a washer on top of the gear. I think there's supposed to be a conical thrust washer there right? This doesn't look conical but I can't see enough of it to tell.





I am including a video too. It's blurry but it at least shows the amount of play.

[media]http://www.youtube.com/watch?v=WRxwQ1_FtJk&feature=youtu.be[/media]
Posted by: F Bill
« on: February 08, 2014, 07:48:08 PM »

That seems excessive, can we see a picture without a finger, closer if you can?
Posted by: Ryan_M
« on: February 08, 2014, 07:23:59 PM »

Ok, so I dodged a bullet on the front diff but now I'm around to the back and have a new question.

Everything looks good - no metal flakes or broken teeth. My concern is with the spider gear pictured just above my fingernail. I can slide it up and down an 1/8", maybe even a 1/4". Doesn't seem like it should have that much play but I can't find anything to confirm that.

What say you great greasy minds?

Posted by: Ryan_M
« on: January 30, 2014, 06:44:33 AM »

Very encouraging news guys, thanks for the help.
Posted by: athawk11
« on: January 29, 2014, 11:28:42 PM »

Ryan,
I agree with the others.� Spin the gears by hand.� If no broken teeth on gears, no grinding sound from the bearings, you're probably just fine.� If inner seals are bad, you can spot gear oil in the axle tubes with a flashlight.� If it's just grease in the tubes, your seals are fine. Button it back up and call it good.

I will add... For insurance and since you have it open, just make sure bearing cap bolts and the bolts holding the large gear to the carrier are torqued to spec.

Tim