Diff rebuild time

[TurboRA28]

Hey all, i'm going to have a go at rebuilding my diff this weekend. I have new bearings, crush tube, brand new ring & pinion gears.

I've never done this before, done plenty of reading on it.. But just want to make sure I get it all right.

My understanding is.....

I fit the original shim to the pinion, pinion bearings, crush tube etc, and install it into the housing.

Get a bit confused here... Do I -

A) torque the pinion down and set the pinion bearing pre-load Install the carrier and set the backlash.. Then check the mesh between pinion and ring gear..

B) Do I just nip up the pinion.. Install the carrier and set the backlash.. Then check the mesh between pinion and ring gear..

If its correct, torque down the pinion and get the preload set correctly.. If its not correct, pull the pinion out, press the bearing off again, shim as necessary and repeat above steps..

If I do method A, do I need a new crush tube everytime I change the shims?
Will method B mean I can reuse the crush tube until I get the mesh correct? Or will it give false readings.

Also, what do I use to shim it.. My diff I pulled apart looks like the diff shop has used a bit of coke can or something dodgy to shim it.

Thanks
Joel

[kingmick]

lol its not coke can its just thim shim material!
make sure you have engineers paste to set your clearances properly!
to the rest! my advice is to pay the extra and get a proper manual for it as its your first time and take your time and follow it step by step! it isnt that hard but you can get it wrong.

[wilbo666]

http://www.cygnusx1.net/supra/librar.../ra/RA_33.html and onwards ->

It says on pg RA-34 to
"Assemble the spacer, oil slinger and oil seal after adjusting the gear contact pattern."

Let me know how you go with; I'm pretty well the same as you I think, I've done a fair bit of reading but no actual building!

The hardest thing to me looks to be setting the pinion bearing preload (as it is such a tiny figure and I don't have a inch-pound torque wrench!)

Cheers
Wilbo

[TurboRA28]

Hey mate, thanks for that link.

Yeah Ive been trying to find a beam or dial torque wrench to check the pinion preload.. But not having much luck!

[wilbo666]

Yep, I didn't have a whole lot of luck either! Stupid dial torque wrenches!

Cheers
Wilbo

[TurboRA28]

Hey all, one quick question for people who has brains that work..

Im having trouble finding a inch-pound torque wrench for a decent price.

My mechanic mate and I have come up with something though...

Toyota specifies that the pinion preload should be between 10 - 16kg/cm . So lets say i do it up to 14kg/cm.

So we are thinking that if you made a bar that bolted to the pinion flange, that is 14cm long then hung a 1kg weight at the end of it. If it doesn't move the pinion, too tight.. If moves it easily not tight enough.

Does that sound right?

I would have to take into account the weight of the bar itself also.

Cheers
Joel

[oldcorollas]

need to take bar into accoutn as well.. the way toyota SST does it (or so i saw) was to attach a kind of pulley to the flange, on which was wrapped a bit of string with a weight.. so the distance is always fixed, and then you can change the weight easily.. and it also checks for tightness as it spins...

got an old water pump pulley and some brickies string around?

[wilbo666]

Hey all, one quick question for people who has brains that work..

Im having trouble finding a inch-pound torque wrench for a decent price.

My mechanic mate and I have come up with something though...

Toyota specifies that the pinion preload should be between 10 - 16kg/cm . So lets say i do it up to 14kg/cm.

So we are thinking that if you made a bar that bolted to the pinion flange, that is 14cm long then hung a 1kg weight at the end of it. If it doesn't move the pinion, too tight.. If moves it easily not tight enough.

Does that sound right?

I would have to take into account the weight of the bar itself also.

Cheers
Joel

Hey Joel,

I've heard of that being done before! And that was what I was planning to do...

Cheers
Wilbo

[thechuckster]

fwiw: percussionists who play the tympani sometimes use micro-torque wrenches to tune the big drums. I also recall seeing a few other kinds of percussionists doing similar things to drum kits and other skinned instruments...

maybe a trip down to a proper muso shop might be in order?

edit: if you were in brisbane, i'd suggest these folks.

[JustCallMeOrlando]

If you find that thread about diff noise I made Joel, the guy with a Jag did a similar to thing to what you were planning, only didn't measure the distance weight properly as he only wanted a measurable increase.

[TurboRA28]

http://www.cygnusx1.net/supra/librar.../ra/RA_33.html and onwards ->

It says on pg RA-34 to
"Assemble the spacer, oil slinger and oil seal after adjusting the gear contact pattern."

Hey Wilbo, do you know what model supra that manual is for? MA60 or? As it has a listing of different pinion washers and in the listing I found the perfect sized one that I need and want to order it from Toyota.

Just that in the MX23 or MS112 F series rear ends they don't have a listing for the size I need. So I figure if I can quote the one from that manual I'll be set.

Thanks
Joel

[wilbo666]

That manual is the MA61 TSRM, from the US.

Cheers
Wilbo

[TurboRA28]

What a pain seems Aus toyota only carry about half the sizes that are listed in that manual and nothing real close to what I want..

I'm after a 2.15mm washer.. They have a 2.24 or a 1.79.
Guess I might have to get the 2.24 machined down, or a 1.79 with a whole heap of shims.

[wilbo666]

Hmm, maybe try a diff shop?!

Cheers
Wilbo

[Draven]

or something like coventry?