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Diff carrier retaining bolts - locktabs?
https://www.ausmini.com/forums/viewtopic.php?f=2&t=81035		 Page 1 of 1
Author:  MattE [ Tue Apr 09, 2013 12:42 pm ]
Post subject:  Diff carrier retaining bolts - locktabs?
Folks,
Just putting a diff back together (six bolts that hold clownwheel to diff carrier), and wonder if I should bin the locktabs and go for some 262 loctite only.
I also recall that 55lb/ft is better than the 60lb/ft specified, as the 3/8" bolts aren't quite up for it.
Thoughts?

Thanks.
Author:  simon k [ Tue Apr 09, 2013 1:33 pm ]
Post subject: 
I use 262 only... but do torque to 60
Author:  MattE [ Tue Apr 09, 2013 1:36 pm ]
Post subject: 
Thanks Simon.
Interesting that upgraded bolts can be bought for almost any job in the mini engine/gearbox, but seemingly nobody offers an upgrade for the diff bolts - do they just not break in use?
Author:  simon k [ Tue Apr 09, 2013 1:43 pm ]
Post subject: 
dunno... my guess is that it's a big friction surface, so the bolts don't do a great deal, like the bolts in a 2 piece flywheel
Author:  drmini in aust [ Tue Apr 09, 2013 4:02 pm ]
Post subject: 
I bought plated NEW grade 8 bolts once for this, the threads peeled off at 55ft/lb. So I only use 50 now. Swiftune says use 45 for the same bolts in the Quaife diff.
They are only a 3/8 UNF thread.. don't be fooled by the head size.
Author:  GT mowog [ Tue Apr 09, 2013 5:27 pm ]
Post subject:  Re: Diff carrier retaining bolts - locktabs?
MattE wrote:
Folks,
Just putting a diff back together (six bolts that hold clownwheel to diff carrier), and wonder if I should bin the locktabs and go for some 262 loctite only.
I also recall that 55lb/ft is better than the 60lb/ft specified, as the 3/8" bolts aren't quite up for it.
Thoughts?

Thanks.


Depends on the bolts. Early ones took 60 ft/lbs no worries, later ones only go to 48 ft/lbs. I haven't tested them so I dunno what the grades are.

As Simon has suggested, locktite.
Author:  MattE [ Tue Apr 09, 2013 6:44 pm ]
Post subject: 
Thanks guys. Did them up with 262, no locktabs, and to 60lb/ft. No indications of stripping out - a good feel the whole way with the torque wrench. 60 does seem a lot for a 3/8" thread, as Doc suggests.
Cheers
Matt
Author:  TheMiniMan [ Tue Apr 09, 2013 7:42 pm ]
Post subject: 
I use the lock tabs, (only very good ones) & i also use the locktite but i use the lockquik primer with it & only torque them to 42lbs

that`s just the way i`ve done it since i was a little fella--> i was thrashing one of our race minis (1071 "S") around Surfers Paradise International Raceway & having a ball fangin around all arvo & into the night,,, the guys waved me in after everyone in the clubrooms had their fair share of drinkahols,,, so i stuck it on the trailer & we went home...

well the next morning i opened up the workshop, let the dogs out into the back yard, cleaned up all the dog poo, emptied all the rubbish bins & etc etc etc before i went to school,,, all normal so far right?

well when i got back from school there was one less mechanic working for us & a big groove dug into the road out the side of our workshop ... & one 1071 race mini with a big hole where the crown-wheel "Used" to be

it smashed through the bottom of the case when they tried to drive it out the front of the shop to park it out the side in Michael St.

Dad hit the roof realising that the diff "could-have" spat out while his 11 year old son (Moi) had just been spinning the thing to 8500rpms around Surfers the day before.

i`ve forgotten who the mechanic was but he didnt locktite or locktab them & i guess that he probably either didnt tighten them up to the right spec, or maybe he over tightened them,,, either way the thing flung itself outa there & buried itself quite deeply into the bitumen. :-)

now i shudder to this day to think what "Could Have" happened

so,,, i fit diffs with a fair bit of attention to detail these days :-)
Author:  simon k [ Wed Apr 10, 2013 11:32 am ]
Post subject: 
drmini in aust wrote:
Swiftune says use 45 for the same bolts in the Quaife diff.


hmmm. I wonder if I followed the instructions that came with the diff, or looked at the torque page in the manual....
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