diff input shaft installation

[abit]

as the title says, maybe someone could please tell me how to properly install primary differential shaft (188 case)? what is the Nm tightening torque for it?
also, heard that its different If you use old or new that bearing sleeve ( 8 )


currently I'm rebuilding my lsd diff, changing clutch discs, bearings etc.
so the bearings will be new, but unfortunately I can't get new that sleeve now, so have to use old one :/

[Madhatter]

It's a crush sleeve. If you have removed the pinion you cannot refit it without replacing the sleeve. You have to lock the flange from turning, then tighten the pinion nut in small increments checking the preload as you go. You are crushing the sleeve and placing load on the pinion bearing when you tighten the nut. So as you tighten it, the preload changes and you take a measurement. It's something like 15 in/lbs.

[TobyB]

This^

And it takes like 150 ft-lbs to crush that sleeve down, which makes it hard to finesse
as you should.

Don't reuse the sleeve. You'll trash your pinion bearings.
t

[fratepedia472]

assuming you're taking out the pinion to replace bearings, generally yes you should replace the crush sleeve everytime; but sometimes you just gota make it work. Take that crush sleeve and use a press (preferably) or vice on the crown to stretch it back out. Do it ever so gingerly and make damn sure its straight when you're done. It only takes the small tweaks to add preload so as long as your bearings hit the sleeve before you start feeling preload you should be fine.

Not saying you won't be tearing it down in a few months to do the bearings again :giggle: ...but it'll work if it has to.

Also use a press to crush the sleeve a little bit then put it on the pinion and into the diff...It'll make getting your preload started wayyy easier. Usually we use a torque multiplier with a breaker bar. Amps up the turning torque to like 700ft lbs.

Bentley says 111ft lbs for the 318i pinion nut and 229ft lbs for every other model.

http://www.e30tech.com/forum/showthread.php?t=76232

^this one has the backlash/preload specs I used when I rebuilt mine. preload on the pinion specs to about 15-30 inlbs depending on the bearings manufacturer, and remember they will loosen overtime. Good luck to you man, everyone makes it out to be tricky like a spaceship, just hit ur specs, get a good contact pattern and let er rip.