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Post by herrkah on Apr 24, 2019 10:23:22 GMT
Stupid me was a bit overenthusiastic stripping my Torsen-2 diff for replacing the seals. As I know by now, you have to measure the torque while losening the drive pinion nut ...
For the smaller diff I found these numbers for the pinion nut: 94-130 ft. lbs. (128-177 N.m).
Can anyone help me with this?
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Post by martiny on Apr 24, 2019 14:18:49 GMT
I read that the torque for the pinion nut is a pretty wide spec but the actual measurement you need to aim for when setting up is the resulting drag on the pinion's rotation - a matter of inch pounds rather than the hundred or so foot pounds you need to begin to crush a fresh crush tube. The only preload spec I can find is 2.1-6.1 inch pounds, but again that's for the smaller 1.6 diff. Can't seem to find the equivalent number for the later 7 inch diffs. Here we go: 7.1 - 12.1 inch pounds: forum.miata.net/vb/showthread.php?t=635461
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Post by Zed. on Apr 24, 2019 14:37:48 GMT
I’d work on the bearing drag to preload (old fashioned springballance to the rescue ) as opposed to using a torque wrench, sometimes the pinion-nut can be tight on its threads & you can get a very false reading with the torque wrench - I’ve seen them ‘click’ off when the bearings have no preload I’ve always used a spring balance or the ‘ force’ on diff preload Rich.
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Post by herrkah on Apr 26, 2019 13:40:05 GMT
martiny + Zed.. thanks for your input. There seems to be no other easy way, so I will fix the nut plus some loctite blue by hand (after having it rattled off with an impact wrench) and keep my fingers crossed Hope I'll get in the right ballpark ...
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Post by martiny on Apr 26, 2019 14:06:10 GMT
Well, you don't necessarily need any fancy equipment to measure 7.1-12.1 inch pounds of preload on the pinion. Just fix a light stick to the end of the pinion, pointing sideways. Hang a 1 pound weight off it. If the weight is hanging less than 7.1" from the axis it shouldn't slip round, but if you move the weight further out along the stick it should start to slip before it gets as far as 12.1". Doesn't seem like too much ballache for the peace of mind.
Metric units are also available.
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