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T-box mysteries

Posted: Thu Jun 06, 2013 10:23 am
by kiwizook
so I'm currently in the process of rebuilding my tbox, and have encounetered a shim that I don't know where it is supposed to live.
the mystery shim
the mystery shim
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I did some investigation, and had a look at where the flanges fit on the tbox. we can see the shaft, and the oil seal, and a gap. There is a protrusion on the flanges that fits in this gap, and seals it off.
flange position
flange position
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I then had a look at the handbrake drum and backplate. I found that the drum is too small for the backplate, and the protrusion/thingy doesn't extend beyond the backplate, and therefore doesn't fill up the gap between the shaft and oilseal.
drum too small for backplate!
drum too small for backplate!
Pic_0606_152.jpg (300.45 KiB) Viewed 5147 times
no protrusion like expected
no protrusion like expected
Pic_0606_153.jpg (265.31 KiB) Viewed 5147 times
so then I found I can fit the shim in this gap, to fill it up, like it should be. I am thinking someone tried to match the wrong drum to the tbox.
shim in suspected place
shim in suspected place
Pic_0606_154.jpg (250.21 KiB) Viewed 5147 times
.

so what are you people's experience regarding these issues? maybe some photo's of the drum and backplate like it should would be greatly apreciated

The other issue I have is that I could not quite get the case to close properly, but could pull it close with some bolts. however, this caused the tbox to turn rather tightly, is this is right? and if now, what is wrong?

Re: T-box mysteries

Posted: Thu Jun 06, 2013 8:30 pm
by kiwizook
anyone got some pics of a standart handbrake drum and backplate?

Re: T-box mysteries

Posted: Sat Jun 08, 2013 10:25 am
by Ladaman
I've got this backplate pic if its any good for you.

Re: T-box mysteries

Posted: Sat Jun 08, 2013 10:46 am
by kiwizook
yeah, that looks the same as mine. the other thing I am interested in is a pic of the drum itself, see how far the centre bit extends beyond the backplate.

ps, will try to get some pics up for you ladaman regarding the handbrake setup

Re: T-box mysteries

Posted: Sat Jun 08, 2013 10:48 am
by Darrell
Did you use a gasket on the case or just silicon sealant ??

Hope this diagram helps...........

Re: T-box mysteries

Posted: Sat Jun 08, 2013 10:52 am
by kiwizook
looking at that diagram, is that green thing supposed to be some sort of shim? might be my mystery shim.

haven't used any gasket yet, just closed the case up to see if it was all working, still got to put some gasket sealant in, it's what was used when i took it apart, so should be alright now, unless I need a proper gasket to free the box up a little now

Re: T-box mysteries

Posted: Sat Jun 08, 2013 10:54 am
by Darrell
Yes the green bit is the shim/spacer..

Here's a link to the workshop manual http://www.4x4.in.th/manual_sj413/chapter14.pdf

Page 14 gives the case clearances.

I've never pulled one apart so "I Dunno" ;)

Re: T-box mysteries,resolved, now rebuild

Posted: Thu Jun 13, 2013 10:29 am
by kiwizook
thanks darell, that's exactly what I needed. to measure the clearances, you need to measure the depth of the bearing seats in the cases. what's the best to do this? I used my vernier caliper, and laid a steel ruler over the face of the case, and lined the vernier up with it, but it's not very accurate. what the best way to do this?

also, does anyone know if there are different thickness thrust washers available for the counter gear?