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Loading rear axle bearings

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Matt from MN

04-18-2003 05:28:30

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I purchased new axles and other related parts for a rebuild job on the rear end for 48 8N. Last night I began to dry fit parts and "load" bearings. I removed all shims and am unable to eliminate end play. For the heck of it I took out the back break plate and then I was able to eliminate end play but I was never able to get both axles to rotate in the same direction even though the bearings were so tight I could hardley turn them by hand. Does this mean something is "a wack" in the differential? I do recall before I started dis assembling that the bearings were previously loaded too tight as both wheels were rotating in same direction while jacked up. Anyone have any ideas? Does this mean I'll have to take off the left trumpet to inspect?

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Dell (WA)

04-18-2003 08:56:50

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Re: loading rear axle bearings in reply to Matt from MN, 04-18-2003 05:28:30

Matt..... ...correctly adjusted rearaxle endplay has the axles moving in opposite direction when one is rotated (its the differential effect). If you have them moving in the same direction (which is wrong) it means the axles are touching each other in center of differential, add a shim.

If you are replacing your axle shaft, did you correctly press your new axleshaft bearing against your axleshaft bearing seat? That effects the axleshaft endplay.

Remember, axle bearings, too loose is better than too tight, but just right is bestest..... ....Dell

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Matt from MN

04-18-2003 09:59:49

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Re: Re: loading rear axle bearings in reply to Dell (WA), 04-18-2003 08:56:50

Dell, thanks for reply. I do realize that they should rotate in opposite directions, however in the I&T manual it says to remove shims until they rotate in same direction and then add shims until they rotate opposite. Well, I removed all shims and they still rotate in the opposite direction and there is way too much endplay. There are no more shims to remove so how do I eliminate end play now? I am certain the bearings are seated properly. Could it be something "broke" in the differential? Just wondering what my next step should be. Any help is appreciated.

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Mountainman

04-18-2003 10:08:34

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Re: Re: Re: loading rear axle bearings in reply to Matt from MN, 04-18-2003 09:59:49

This is just a wild guess at best. And from a poor memory of the FO-4 that is still hidden in storage somewhere.

Could there possibly be some additional shims hiding behind the brake backing plate on the side you didn't remove? If you took off both brake backing plates then I am fresh out of ideas.

hth

Mountainman...CA

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Matt from MN

04-18-2003 10:15:15

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Re: Re: Re: Re: loading rear axle bearings in reply to Mountainman, 04-18-2003 10:08:34

I have removed both backing plates and all shims, all surfaces have been cleaned and everything.

I am using the old bearings, they appear to be in good shape, could it be possible that they are worn out and my amature eyes can't tell?

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Mountainman

04-18-2003 10:31:38

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Re: Re: Re: Re: Re: loading rear axle bearings in reply to Matt from MN, 04-18-2003 10:15:15

Matt,

Normaly, like you, I would just use the original bearings if they 'looked good'. But since there is a definite problem, I think I would either use new (made in USA) bearings or take the old ones to a machine shop and ask if I was uncertain about them.

Are the bearings fully seated on the axle? And is the race fully seated?

Did you compare the old axles with the new?

hth

Mountainman...CA

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Matt from MN

04-21-2003 10:57:41

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Re: Re: Re: Re: Re: Re: loading rear axle bearings in reply to Mountainman, 04-18-2003 10:31:38

I took a closer look and compared old axles to the new and found that the bearing seat on the new axles is 1/8 inch closer to the the differential which is why I couldn't get the end play eliminated even after removing all shims. I am really dissappointed with the parts which I purchased as that wasn't the only problem I had with them. To remidy the problem I made two small shims and placed behind bearing prior to seating it. Guess you need to be careful of where you are purchasing parts! Thank you for all your input.

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