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Questions on pinion seal replacement
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<blockquote data-quote="caveeagle" data-source="post: 12035682" data-attributes="member: 128063"><p>by: ~blue65</p><p></p><p></p><p>Hey, blue65, I know that you said you worked at a shop and have done a few of these, but your info seems contrary to some differential basics. I certainly yield you your knowledge on this, but I was hoping you could consider a couple points and validate your take on this.</p><p></p><p>a) turning torque it determined by the depth of the crush washer (or spacer), right. So In theory, if you change nothing but the seal and don't further crush the spacer (in this case a solid one), there should not be any change to the rotational torque (or pinion bearing preload). </p><p></p><p>b) the torque force required to crush the spacer/washer is significantly greater than the torque spec for the pinion nut. (I know it is on the 8/9" diffs). So if your pinion bearing pre-load is within spec with the old seal and you do not exceed the lower torque value (nut only), you really should be fine. Yea, I know you could screw it up and over-torque it, but you can screw anything up if you try hard enough.</p><p></p><p>I am perfectly willing to learn a lesson on this one, I would just like to hear your response on these points. No disrepect intended, but I have often run into professional mechanics that cling to myth and old-school knowledge, rather that a fact based approach to things.</p></blockquote><p></p>
[QUOTE="caveeagle, post: 12035682, member: 128063"] by: ~blue65 Hey, blue65, I know that you said you worked at a shop and have done a few of these, but your info seems contrary to some differential basics. I certainly yield you your knowledge on this, but I was hoping you could consider a couple points and validate your take on this. a) turning torque it determined by the depth of the crush washer (or spacer), right. So In theory, if you change nothing but the seal and don't further crush the spacer (in this case a solid one), there should not be any change to the rotational torque (or pinion bearing preload). b) the torque force required to crush the spacer/washer is significantly greater than the torque spec for the pinion nut. (I know it is on the 8/9" diffs). So if your pinion bearing pre-load is within spec with the old seal and you do not exceed the lower torque value (nut only), you really should be fine. Yea, I know you could screw it up and over-torque it, but you can screw anything up if you try hard enough. I am perfectly willing to learn a lesson on this one, I would just like to hear your response on these points. No disrepect intended, but I have often run into professional mechanics that cling to myth and old-school knowledge, rather that a fact based approach to things. [/QUOTE]
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