GKN differential bolt torque settings
Discussion
I thought I had the GKN diff torque settings to hand from previous posts on Pistonheads but I think what's out there is for the BTR diffs.
Can you please confirm the torque settings for the GKN diff?
Top rear diff bracket
2x M8 cap head ???
2x M10 cap head 45 Nm
Top rear diff bush pinch bolt
1x 7/16 UNF with Nyloc 60 Nm
Diff front screws to the mounting brackets
4x M12 cap head 125 Nm (seems excessive?)
4x M12 lock nuts ???
Diff bushes to chassis (those long bolts)
2x 7/16 UNF with Nyloc 65 Nm
Can you please confirm the torque settings for the GKN diff?
Top rear diff bracket
2x M8 cap head ???
2x M10 cap head 45 Nm
Top rear diff bush pinch bolt
1x 7/16 UNF with Nyloc 60 Nm
Diff front screws to the mounting brackets
4x M12 cap head 125 Nm (seems excessive?)
4x M12 lock nuts ???
Diff bushes to chassis (those long bolts)
2x 7/16 UNF with Nyloc 65 Nm
M8 = reasonably tight
M10 = really quite tight
M12 & 7/16" = jolly tight
A general guide I was taught as an apprentice was to use a spanner, the bigger the nut the longer the spanner the tighter you can tighten it.
People snap bolts off when they use little sockets on 1/2" drive ratchets
phillpot said:
M8 = reasonably tight
M10 = really quite tight
M12 & 7/16" = jolly tight
A general guide I was taught as an apprentice was to use a spanner, the bigger the nut the longer the spanner the tighter you can tighten it.
People snap bolts off when they use little sockets on 1/2" drive ratchets
Thanks - would you add some blue Loctite to the threads for these (except for the Nylocs)?M10 = really quite tight
M12 & 7/16" = jolly tight
A general guide I was taught as an apprentice was to use a spanner, the bigger the nut the longer the spanner the tighter you can tighten it.
People snap bolts off when they use little sockets on 1/2" drive ratchets
Thanks everyone for the help. I replaced the worn fixings with new high tensile ones rated at 12.9 and used a little bit of blue thread locker for extra measure too.
I tightened things initially how tight I thought they should be using a short 3/8” ratchet and then used a 3/8” short torque wrench for the final checks. Nothing was silly tight and it certainly took a lot more ummph to remove the originals than what I applied to tighten things up due to corrosion.
Anyway I used on the bracket:
M8. 35Nm
M10. 45Nm
I also checked how 120Nm felt for the M12 bolts with the diff on the floor and surprisingly that torque spec didn’t feel too much either. Will get new fixings for those too as I’m not happy with one or two of the cap heads.
Thanks again for the pragmatic info. Diff refurb was carried by John Reid.
Next I need to finish tidying up the chassis in that area and refit the diff. Must remember to fill the diff before reinstalling too!
I tightened things initially how tight I thought they should be using a short 3/8” ratchet and then used a 3/8” short torque wrench for the final checks. Nothing was silly tight and it certainly took a lot more ummph to remove the originals than what I applied to tighten things up due to corrosion.
Anyway I used on the bracket:
M8. 35Nm
M10. 45Nm
I also checked how 120Nm felt for the M12 bolts with the diff on the floor and surprisingly that torque spec didn’t feel too much either. Will get new fixings for those too as I’m not happy with one or two of the cap heads.
Thanks again for the pragmatic info. Diff refurb was carried by John Reid.
Next I need to finish tidying up the chassis in that area and refit the diff. Must remember to fill the diff before reinstalling too!
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