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Old 11-27-2008, 04:20 PM   #1
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Default TA-05 Ball Diff problem

Hey all I got one which has me stumped.

My TA-05 has a Ball diff that keeps coming loose!

It's a 12 ball set up from the IFS-R so it has the TRF416 plates, and I have alloy outdrives and Jaad Ceramic Diff Balls.

Tightens up and feels fine after rebuild but always seems to come loose usually mid-race which is never a good thing.

I have tried replacing the spring, diff plates, screw, lock nut and the little plastic thing the lock nut goes into and I have even checked and re-lubed the 2 * 850 bearings in there, still does it! I have built this the way I was told to which is gradually tighten and work the diff until it's fully tight then back out 1/2 to 3/4 which should be a good setting. The diff never slips initially, but after a run, when you go to tighten it, nothing!

Any ideas? I'm don't think my method of building is off as the other diff in the car has been rock solid.
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Old 11-27-2008, 05:46 PM   #2
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I'm not sure if it was an oversight or not, but you've mentioned replacing everything other than the thrust bearing?

After replacing what you've done and it still comes loose, sounds to me like the thrust bearing isnt doing its job properly. If it sticks or has a cracked ball inside then it wont be able to spin properly and hence can loosen up the bolt/nut.

It only takes a grain of sand to stick in there for that to happen.
Also, overtightening the diff nut/bolt can put pressure on the thrust bearing and squashing it out of action.

Just a thought anyways?

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Old 11-27-2008, 06:12 PM   #3
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place a drop of threadlock in your diff nut.....but it's only work if your thrust bearing is in good shape otherwise it's still will come loose out...
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Old 11-27-2008, 06:30 PM   #4
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Yeah that was my next thing to check, got some thrust bearings coming in as noone locally seems to have them
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Old 11-28-2008, 04:52 AM   #5
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Be careful what threadlock you use on the nut if you go down that route, i've heard some bad stories of the nyloc in the nut getting melted

If it is a nyloc nut in the diff (I think most tamiya diff nuts are) they don't usually need threadlock on them.
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Old 11-28-2008, 05:47 AM   #6
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I've been using thread lock on tamiya diff so far without any problems. The tiny bit will do.

By the way, did you run in your diff after rebuilts? It does go loose after the 1st few runs and have to be retighten.
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Old 11-28-2008, 05:53 AM   #7
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Must admit, ive not had any issues either with the Tamiya stuff, but cant say which brands might give issues.
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Old 01-06-2009, 04:30 AM   #8
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I always use thread locking compound on any metal-to-metal fasteners that are exposed to high stress and/ or vibration. I'm not all that worried if it's a nyloc nut or not; theres still a portion of the nut that has metal threads.

I usually check my work when building things like diffs; I'll check for proper fit, cleanliness, smell for smoke or weird chemical burns, correct funtion of moving parts, etc.

Even if the brand of thread locking compound does eat the nylon insert, no problem. I would clean out the affected area, and let the loctite dry, and then simply backfill the empty area with a small dab of shoo goo. And of course I'd keep that sub-assy out of the car until that shoo goo is dry too; in this case w/ a diff. Otherwise I might as well pour liquid latex on the thing and throw it in and run it - doh!!!!!
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Old 01-06-2009, 06:04 AM   #9
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Sorted this a while back, thrust bearing was buggered
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