pinion nut torque - solid collar

[Cruiser70]

Hi all,
I need to replace the pinion oil seal on the rear diff.
Have done it before, but these have always been with crush sleeves.

My diff has an arb locker with a solid collar.

How tight and what torque whould I do it back up to after replacing the seal?

Thanks

Martin.

 

[Radd Cruisers]

Use the spec from the earlier land cruisers that did not have the crush sleeve.

145 - 173 ft lbs.


~John

 

[Cruiser70]

Cheers John, Will give that a try. BTW its an 8" diff with an arb locker from Just Differentials suppose I could ask them what they would have torqued it up too?
Been a good diff so far no probs, think the last batch of water/sand/mud on a tame event we attended killed the seal. Had this happen quite a lot on my KZJ70 and a friends LJ70...but its the first time since the new diff. I am sure its fine

 

[jake2far]

Hi all,
I need to replace the pinion oil seal on the rear diff.
Have done it before, but these have always been with crush sleeves.

My diff has an arb locker with a solid collar.

How tight and what torque whould I do it back up to after replacing the seal?

Thanks

Martin.

While the torque value on the pinion nut is important, the critical setting related to the nut torque is the rolling resistance of the pinion shaft bearings. the pinion nut should be torqued to produce a rolling resistance of somewhere between 6-10 inch pounds (used bearings, new bearings are different), if the nut is torqued to a set value of say 145 ftlbs and the rolling resistance is either to loose or to tight the gears could be damaged (to loose causes misalignment of the ring and pinion)
or the bearings can be damaged ( to tight causes spauling), so the the correct nut torque produces the correct rolling resistance.
If the correct rolling torque can not be obtained with the nut being properly torqued than shims need to be added or subtracted depending on the relationship of rolling verse pinion nut torque.
Hope this helps

Jim

 

[Radd Cruisers]

While the torque value on the pinion nut is important, the critical setting related to the nut torque is the rolling resistance of the pinion shaft bearings. the pinion nut should be torqued to produce a rolling resistance of somewhere between 6-10 inch pounds (used bearings, new bearings are different), if the nut is torqued to a set value of say 145 ftlbs and the rolling resistance is either to loose or to tight the gears could be damaged (to loose causes misalignment of the ring and pinion)
or the bearings can be damaged ( to tight causes spauling), so the the correct nut torque produces the correct rolling resistance.
If the correct rolling torque can not be obtained with the nut being properly torqued than shims need to be added or subtracted depending on the relationship of rolling verse pinion nut torque.
Hope this helps

Jim

When using a hard spacer and shims, once the pinion bearing pre-load is set properly, the torque on the pinion nut will have almost no effect on the bearing pre-load. The pinion nut is never used to set pre-load of a bearing, that is exclusively the function of the shims and spacer. Note that the shims should be very clean when setting the pre-load values as dirt may have some affect on your values.

Now, if you're using a crush sleeve, then that is different and the torque value is pretty much irrelevant and the bearing pre-load is the critical factor. Note that a crush sleeve should never be re-used as one cannot obtain proper pre-load of the bearings and proper pinion nut torque with a used part.

~John