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Disc Brake Castle Nut Torque Spec Confusion


Best Answer Spider , 01 July 2019 - 09:38 PM

There was a change in CV spec (I can't recall when, I think 86?).

 

The early Disc Brake type CVs had 2 holes for the split pin and the correct torque for these is 150 ft / lb then further tighten around to the next slot.

 

The latest spec CVs, identifiable by a single hole for the split pin is 197 ft / lb then tighten further to the next slot.

 

The change came about to reduce chaffing of the wheel bearing (inner) cones and the spacer.

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#16 nicklouse

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Posted 02 July 2019 - 12:39 PM

Chapter 14 is always interesting.

#17 Dusky

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Posted 02 July 2019 - 12:58 PM


Imagine being the poor guy who made the workshop manual and wrote all the torque specs down.

I mean, that was my question, Since the spec seemed to change from earlier books to later ones and I was a little curious as to why.

I'm not the biggest or strongest person and to be honest, I have found that if I tighten a nut or bolt on the car such that it is tight for me, someone can usually come along and tighten it further. Hence, I try to stick to the book torque specs. Putting numbers to things makes it less likely that I'll have made a mistake. It's especially useful if, like me, one is a noob at mechanics :P

It's the best thing to do really, torque figures exist for a reason, especially on bearings etc.
But mind, doing this by the book is frowned upon these days. ;)

#18 Spider

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Posted 04 July 2019 - 12:58 AM

ET = Extra Tight.

Of course I could have used the other expression FT, but I thought that might be a bit rude!

 

I edited your posts the other day as you of all people should know it needs to be tighter than " FT " - 'Finger Tight' !!!

bJwRxet.jpg



#19 Rorf

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Posted 04 July 2019 - 05:54 AM

Love it - ha ha. I need one of those spanners for my tool cabinet, hang it next to the pliers and the 8 gauge wire and nearly forgot - the duct tape. Need these items when owning a mini and a land rover. :lol:



#20 M700FGT

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Posted 13 July 2019 - 10:02 PM

Im also having some issues with my castle nuts as both front have come loose not long after the guards fitted new bearings.

 

Im pretty sure they wouldn't of torqued them up so i will look at them now i know the correct torque.

 

One question though, could you add a bit of thread tight / lock tight ?



#21 nicklouse

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Posted 13 July 2019 - 10:15 PM


One question though, could you add a bit of thread tight / lock tight ?


Not needed as that is what the split pin is for.

#22 Magneto

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Posted 14 July 2019 - 12:41 AM

Tighten to spec, then advance to the next hole. New cotter pin. They will not come loose then......



#23 Spider

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Posted 14 July 2019 - 12:48 AM

Im also having some issues with my castle nuts as both front have come loose not long after the guards fitted new bearings.

 

Im pretty sure they wouldn't of torqued them up so i will look at them now i know the correct torque.

 

One question though, could you add a bit of thread tight / lock tight ?

 

The nut can appear loose for a variety of reasons. One is that it may torque up and appear tight to start with but can slacken off soon after driving. One cause for this is not the nut undoing, but if there's grease between the Bearings, Spacer, CV and Drive Flange faces it can loose clamping and show in fact that it wasn't correctly torqued up in the first instance. If you suspect this, after a short drive (10 miles of so) check the nut again.

 

Other causes can be;-

 

    Worn shaft on the CV

    Worn Drive Flange

    Worn Tapered Washer (the one behind the Nut)

    The Tapered Washer being too tight on the CV to start with (refer to your other thread and the link I've posted in that)

    Back of the Nut Worn






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