Pinion seal change - Help with Lug nut pre-load. - Ford Mustang Forum
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post #1 of 5 (permalink) Old 06-07-2017 Thread Starter
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Exclamation Pinion seal change - Help with Lug nut pre-load.

Hey guys,

I had my Pinion seal changed but the mechanic did not checked the pre-load on the lug nut, now it's to tight (whining noise) if we take it back out, how do we know how to place it correctly?

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post #2 of 5 (permalink) Old 06-08-2017
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If only the pinion seal was replaced I would not think you need to check the pinion pre-load. An inch-pound torque wrench typically used for bicycle repair is used to test pinion pre-load, this is with the axles removed.



Your likely problem is that the pinion nut was replaced with an impact gun and not properly torqued to factor specifications. If the nut is too lose this can be corrected by torquing properly, if the nut is too tight the "crush sleeve" may be compressed to much and the original pre-load can not be achieved.

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post #3 of 5 (permalink) Old 06-08-2017
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As seen in the pic that Scott2 posted, you'll want to use a beam-style torque wrench, not a clicker. Use that to measure the amount of torque required to freely turn the pinion. Tighten the nut a little at a time with a ratchet or breaker bar, frequently stopping to check the preload. On an axle with used bearings, there should only be about 8-14 lb-in of preload. Be careful and DO NOT overshoot that figure.

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post #4 of 5 (permalink) Old 06-12-2017
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You'll need a new crush sleeve and crush it to read about 15 or slightly less inch lbs with the used bearings in your case. I'd get a new nut as well. I installed a solid spacer in mine so I don't have to worry about preload, But seeing your mechanic over crushed yours you can't measure your crush sleeve to obtain the proper dimension to shim the solid spacer to get the same proper preload. You could crush a new sleeve to the right preload and then take everything apart and measure it and then put back together with the solid spacer. Lots of work. Good luck with your mechanic. Posts 3 and 4 above are good advice and illustrate as how to measure peload.

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Last edited by lenko; 06-17-2017 at 11:51 AM.
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post #5 of 5 (permalink) Old 06-12-2017
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Scott2 said:
"If only the pinion seal was replaced I would not think you need to check the pinion pre-load. An inch-pound torque wrench typically used for bicycle repair is used to test pinion pre-load, this is with the axles removed."

That's possible but you would have to get the nut to exactly that same position it was before you took it off to the remove the seal. It's possible and I've seen posts where some mark the position of the nut, but that's hard to do and I wouldn't rely on that unless the preload read within the parameters.

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Last edited by lenko; 06-17-2017 at 11:44 AM.
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