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Tool Talk Discussion Forum

Re: warm differential

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Author  [Modern View]

10-06-2013 16:43:02

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After you replaced the pinion seal, how did you adjust the pinion preload? If you don't know what preload is, then I can tell you what your problem probably is. Remove the driveshaft and try to turn the yoke by hand, if it won't turn easily, the preload is probably too high. If it's a little bit tight, the pinion bearings will loosen up in time. If it's way too tight, the bearings will fail.

Unfortunately, if you've overtightened the pinion nut, it's not a simple matter of loosening the nut to reduce preload. There's a crush tube between the yoke and pinion gear, and once you overshoot the correct preload the only way to reduce it is to replace the crush tube and start all over again.

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10-06-2013 20:31:37

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 Re: warm differential in reply to MarkB_MI, 10-06-2013 16:43:02  
Thanks for the information, I will see how the yoke turns. When I took it apart I made a couple reference marks on nut and counted turns on the nut, also made a measurement with caliper to make sure I wasn't a turn off. Ended up about a quarter turn short when I tightened nut back up.

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10-07-2013 07:42:59

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 Re: warm differential in reply to nisse, 10-06-2013 20:31:37  
I dropped the driveshaft and it isn't too tight if anything might be loose I couldn't really feel any drag. Can't hear any noise with stethoscope or driving except for a slight clunk when braking hard at low speed.

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10-07-2013 06:59:42

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 Re: warm differential in reply to nisse, 10-06-2013 20:31:37  
Whenever I repl. a pinion seal I center punch a spot on the pinion end, the yoke and the nut then tighten until they line up plus a hair more.

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10-07-2013 02:10:07

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 Re: warm differential in reply to nisse, 10-06-2013 20:31:37  
Hmm. If it's indeed a quarter turn short, that would mean insufficient preload. You wouldn't even be in contact with the crush sleeve, and the nut usually needs it a bit tighter than before to compensate for bearing wear. I'd expect the rear end to be noisy if you didn't get enough preload, due to pinion gear movement.

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The tractor vet

10-06-2013 17:49:52

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 Re: warm differential in reply to MarkB_MI, 10-06-2013 16:43:02  
Ah yes ford and there stupid crush spacers . And replacing the old with new on old bearing and trying to get a GOOD rolling preload . After eating a ring and pinion on my 88 F350 due to it self crushing while backing a load up a hill i did away with it and had the machine shop i delt with make me up some solid spacer in different thickness. Yea it took a bit to get the rolling preload on the bearing but once set it was set never to move again . Shortly after mine went out i did five more back to back for customers . Two had two failures before and non after my barnyard repair.

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