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HELP Please
Hopley89 - 1/12/17 at 03:59 PM

I need to know what torque for the drive shaft bolts,
bolts from shaft to diff and shaft to hub ect

tegwin - 1/12/17 at 04:13 PM

You are going to have to tell us what diff/driveshaft you have otherwise any numbers given will just be a random guess....

Hopley89 - 1/12/17 at 04:17 PM

sierra duff with bolt on shafts, and shafts are from mk

NigeEss - 2/12/17 at 09:13 AM

According to Autodata 250-290nm

phelpsa - 2/12/17 at 09:59 AM

quote:
Originally posted by NigeEss
According to Autodata 250-290nm


That's for the hub nut.

I normally use brand new 12.9 M8 cap head bolts, Loctite 243 and 40Nm.

Hopley89 - 2/12/17 at 10:04 AM

quote:
Originally posted by phelpsa
quote:
Originally posted by NigeEss
According to Autodata 250-290nm


That's for the hub nut.

I normally use brand new 12.9 M8 cap head bolts, Loctite 243 and 40Nm.


I used a 12.9 m8 allen key head bolt, medium loctite and 45flbs
i couldn’t use a normal bolt as i couldn’t get the sockets on as it’s too tight between the grease
cover and the bolt!

Thank you all for your help

Paul Turner - 2/12/17 at 05:02 PM

quote:
Originally posted by Hopley89
quote:
Originally posted by NigeEss

I normally use brand new 12.9 M8 cap head bolts, Loctite 243 and 40Nm.


I used a 12.9 m8 allen key head bolt, medium loctite and 45flbs
i couldn’t use a normal bolt as i couldn’t get the sockets on as it’s too tight between the grease
cover and the bolt!

Thank you all for your help


45 ftlbs is 61Nm, looks like you have over tightened if 40 Nm is correct.

Hopley89 - 2/12/17 at 05:07 PM

i was told yesterday between 35 and 40flbs
surly a slightly bit over tight is better than lose..
i’m going back to the mechanics monday morning, as i can use his lift to
do some work as i want to do a complete spanner test and check.

Paul Turner - 2/12/17 at 05:12 PM

quote:
Originally posted by Hopley89
surly a slightly bit over tight is better than lose.


Not if its over stressed the fastener. Always tighten to the manufacturers figure, they know about these things, know way more than the bloke down the pub.

If 40 Nm is correct you have gone over that by just over 50%, hardly a bit is it.

Hopley89 - 2/12/17 at 07:09 PM

That’s the torque i was told by the manufacture but i will check them all monday and losen if needed

daviep - 2/12/17 at 10:51 PM

quote:
Originally posted by Hopley89
That’s the torque i was told by the manufacture but i will check them all monday and losen if needed


I would replace all bolts, 45lbs/ft is way over the top for an M8 12.9, you have actually taken the bolt past the minimum failure figure.

If you lubricate the thread and head then 40Nm torque would generate a load of 30.5kN this is 68% of the 44.6kN minimum ultimate tensile load

If you lubricate the thread and head then 60Nm torque would generate a load of 46.1kN this is 3% over the 44.6kN minimum ultimate tensile load

The above calculations are not 100% accurate as the friction in the system between bolt and hole and the co-efficient of the lubricant are not known with 100% accuracy, however they will be close.

Cheers
Davie

Hopley89 - 2/12/17 at 11:59 PM

if that’s what the manufacturer states for the recommended torque value?
someone said on this post,
250-290nm

for the cost of the bolts i will change them when i get to the garage monday.

CosKev3 - 3/12/17 at 12:43 AM

quote:
Originally posted by Hopley89
if that’s what the manufacturer states for the recommended torque value?
someone said on this post,
250-290nm

for the cost of the bolts i will change them when i get to the garage monday.


That's for the massive hub nut on the end of the outer drive flange

Hopley89 - 3/12/17 at 12:46 AM

quote:
Originally posted by CosKev3
quote:
Originally posted by Hopley89
if that’s what the manufacturer states for the recommended torque value?
someone said on this post,
250-290nm

for the cost of the bolts i will change them when i get to the garage monday.


That's for the massive hub nut on the end of the outer drive flange


Oh ok, my bad