Quote:
Originally Posted by Admiral Ahani
I started at 50 ft-lb, and I went up to 85 ft-lb before I had a thought...
If my 2.47 diff does not have a thrust washer....... then is there any reason to even be worried about over-torquing? There's no washer to crush, so why can't I just go to 132 ft-lb and see what happens? Obviously there's no risk of damaging the pinion bearing, unless I go way up to like 160 ft-lb.
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There are no “thrust washers” or thrust bearings in the pinion assembly. They are pre-loaded Taper Roller Bearings with a crush sleeve between the two bearings that will
only collapse further at a torque of
more than 132 ft-lbs. Since you said that the nut released at “maybe 75 ft/lb” you should reset the friction.
Quote:
Originally Posted by Admiral Ahani
Here's my problem. With the nut off, the turning resistance was the same, i.e. a little hard to turn. …… but with the nut off, shouldn't it turn freely?
So..... how am I supposed to tighten down this nut without over-tightening? I thought I would tighten it down until the turning resistance came back, but I can't see how I can do that.
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The pinion should have turned freely when you released the nut. Taper Roller Brgs are a very close fit onto the shaft, zero to 5µ clearance, and it is the pre-load that locks them onto the shaft.
To reset the friction:
1) Turn the nut back 2 to 3 turns and tap the pinion shaft with a brass drift until you can feel a little side and end play on the pinion shaft.
2) Tighten the nut gently until you can just feel a measurable friction and then set it at 8 inch/lbs. If the crush sleeve has not been over-crushed you should then be able to continue to torque the nut to 130 ft-lbs without increasing the friction any further as 130 ft-lbs is too low to further crush the sleeve.
If further tightening increases friction then the crush sleeve must be replaced.
05-18-2012, 09:16 AM
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