Torque error in FSM - differential carrier nuts

[fullspeed]

Potential error in FSM for torque

I ran into an issue installing the differential carrier in the rear end. I had problem torquing the nuts to 54ft lb per the FSM, which seems excessive for the small nuts/studs. I think it is an error.

To help others avoid pain,
If there is agreement, can SV_dude or someone else make a note about this in the torque spec link from the sticky.


I copied the following from a tread from TorqueOfTheDevil - who did a really good job with this along with attachment (this is discussed in some other threads also
---------------
I took note of all the torque settings and started torqueing up everything as it should be, at the time I did think "that's weird, and a crazy amount of torque for a very small nut and stud"... even when tightening it up I thought "This doesn't feel right" checked the numbers again and carried on, stripping the thread on one nut.

It turns out that the TSRM states that the diff carrier bolts should be torqued up 3x more than they should be.. and like an idiot I didn't question my gut instinct...

I attached a screenshot.. spot the error!!!

Needless to say, the stud and nut were very easily removed (yay new parts come undone nicely too) and replacements are on order from Toyota, to arrive on Tuesday.
-------------

 

[TorqueOfTheDevil]

There was frustration that day

 

[fullspeed]

lost time

Yes, I lost a lot of time because of this.

BTW, TorqueOfTheDevil, you do super nice work, those rear disk brakes on you runner are very impressive.

 

[infamousRNR]

Potential error in FSM for torque

I ran into an issue installing the differential carrier in the rear end. I had problem torquing the nuts to 54ft lb per the FSM, which seems excessive for the small nuts/studs. I think it is an error.

To help others avoid pain,
If there is agreement, can SV_dude or someone else make a note about this in the torque spec link from the sticky.


I copied the following from a tread from TorqueOfTheDevil - who did a really good job with this along with attachment (this is discussed in some other threads also
---------------
I took note of all the torque settings and started torqueing up everything as it should be, at the time I did think "that's weird, and a crazy amount of torque for a very small nut and stud"... even when tightening it up I thought "This doesn't feel right" checked the numbers again and carried on, stripping the thread on one nut.

It turns out that the TSRM states that the diff carrier bolts should be torqued up 3x more than they should be.. and like an idiot I didn't question my gut instinct...

I attached a screenshot.. spot the error!!!

Needless to say, the stud and nut were very easily removed (yay new parts come undone nicely too) and replacements are on order from Toyota, to arrive on Tuesday.
-------------

Good find'! [MENTION=148218]JZiggy[/MENTION] found this error when we were doing his 3rd member & axle seals at [MENTION=120071]mtbtim[/MENTION] place..

We mention this in the video. Editing is still pending so stay tuned!

 

[catrains]

I do use a chart a torque chart for hardware. I use it if I believe there is an issue with the OEM manual on torque.

when you study the chart and then the oem torque settings they usually always agree but I also have found errors.

on old vehicles rusted nut/studs should be replaced since the threads are not all there and the friction can be reduced causing the fasteners to loosen.

the finer the threads the better the fastener will not loosen.

 

[derpiful]

This explains quite a bit... ran into this problem last weekend tightening them down. Eventually just tightened them to what feels right and not even getting close to the listed spec. Thanks for pointing this out!

 

[JZiggy]

You realize the Toyota engineers just guesstimate their torque values as well. We see precise looking numbers like 18 ft-lbf or 54 but they are actually specifying 100 kgf-cm in nice round numbers

Very good recommendation to use a torque chart to check if you're in the ballpark. Lots of small fasteners on Toyota are mid-grade (metric class 8 or SAE grade 5). Whereas in Hondas nearly every single nut and bolt is a class 10 (like grade 8).

 

[FJ40zen]

I use 54 ft/lbs on the flange nuts only. On my Runner and on my FJ40... actually I've used that torque on every Toyota 4x4 I have had over the years where I had removed the driveshafts.