pinion crush sleeve?

[LaJ10]

What does a crush sleeve actually do on a pinion gear?

[Stuka]

puts pre-load on the bearings. D44's dont use a crush sleave. But like a GM 10 bolt does.

[Crazy_Jeepman]

AMC 20 will use this and it does set the bearing preload. You have to torque the pinion yolk nut to the torque spec, the sleave crushes and sets the preload. If over torqued, it needs to be replaced, can not be reused.

[bcgrown]

Dana 44 axles do use a crush sleeve. When setting up pinion bearing preload you need to have a dial or beam type torque wrench that can measure the turning torque of the pionion. Keep tightening the pinion nut and keep checking the turning torque until the specified turning torque is reached. The crush sleeve will collapse as you are tightening and will maintain the proper preload, it actually doesn't put preload on the bearing, the pinion nut does that.

[Crazy_Jeepman]

Originally posted by bcgrown:
Dana 44 axles do use a crush sleeve. When setting up pinion bearing preload you need to have a dial or beam type torque wrench that can measure the turning torque of the pionion. Keep tightening the pinion nut and keep checking the turning torque until the specified turning torque is reached. The crush sleeve will collapse as you are tightening and will maintain the proper preload, it actually doesn't put preload on the bearing, the pinion nut does that.Must be new D44's, I have setup quite a few D44 in the FSJ's no crush sleeves in them. The the bearing preload is set with shims till the correct preload is reached.

[Stuka]

Ya the D44 in my 75 cherokeee isnt done this way. Maybe the aluminum housing baby D44's in TJ's are done like this.

[Crazy_Jeepman]

I was sure I remembered bcgrown being under the impression that the D44 had crush sleaves, from another topic.
Pinion Seal Topic (http://www.ifsja.org/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=2;t=016280)

Pic of the D44 and AMC 20, D60 also available if there would be any question on that having Crush sleeves ;)
Pictures Worth 2000 Words (http://images.andale.com/f2/116/106/4651773/1049177826019_D44_AMC20.JPG)

[LaJ10]

I was talking about a AMC 20,sorry I didnt mention that before.Would the crush sleeve really be neede or wont the bearing preload on the race?

[Crazy_Jeepman]

Originally posted by LaJ10:
I was talking about a AMC 20,sorry I didnt mention that before.Would the crush sleeve really be neede or wont the bearing preload on the race?Yea we all knew you meant the AMC 20, LOL well most of us. The Crush sleave is needed, no way around it. ;)

[LaJ10]

Ok if it is needed what do you do if you cant crush the crush sleeve.I ask this because I cant make mine budge.I even put a big IR impact on it and still no go.When I was test fitting everything with out the sleeve it all fit good.

[LaJ10]

BTT

[Stuka]

erm...something isnt being done right. it doesnt take much torque to crush it. i would have to look in my TSM.

[Crazy_Jeepman]

Sounds to me you need a manual. You are supposed to torque to specs, if you used an impact you have ruined the Crush Sleave. Torque to specs and thats all there is to it. What is got me wondering, is how do you know the sleave is not crushed?

[LaJ10]

When I put it together without the sleeve I can torque the pinion nut to proper specs,but when I add the sleeve the pinion nut gets tight long before the bearings get seated.Without the sleeve in test fits everthing tightens properly and the pattern on the gears looks good.But if I put the sleeve in the pinion bearings wont go in all the way to the races.

[Crazy_Jeepman]

Yea something is very wrong torque is around 20 to 25 LBS on the Pinion Nut. You have something amiss. Double check everything you did with the manual. I never had that happen and won't venture a guess as to what is wrong.

[ April 02, 2003, 07:06 PM: Message edited by: Crazy_Jeepman ]

[LaJ10]

On the AMC 20 the front pinion bearing is pressed on when you put on the yolk.The bearing will not slide onto the pinion freely.I got this info from a local offroad shop and a couple of web sites.Also when I took the old pinion out I had to heat it a small amount to get it free enough to be knocked out with a sledge hammer.One wierd thing is that the old crush sleeve and the new crush sleeve are the same length.Which leads me to believe that the old 1 wasnt crushed much.

[Crazy_Jeepman]

It only crushes by a few thousand's of an inch, unless you have a really good eye, pretty sure you won't see it. ;)