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post #1 of (permalink) Old 03-11-2001, 04:12 PM
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Rear Dana 44 bearing

The drivers side tire hub and axel came off my '64 cj the other day. Fortunately I was going slow because I knew there was a problem and was just trying to get home. Almost made it. The bearing and inner race were basically melted to the axel shaft. The outer race was in the tube and didn't appear to have spun. We removed it with a slide hammer puller. Here's the question: What would cause this to happen to an axel that was rebuilt only a few thousand miles ago??? It's the older style two piece type. I know you are going to say fix it by going to one piece axels which is of course what i plan on doing.
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post #2 of (permalink) Old 03-11-2001, 04:24 PM
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Re: Rear Dana 44 bearing

Not sure of what you mean by 2 piece design (lots of bearings use a separate race). If it was over lubricated or under lubricated it will burn up the bearing. Also, if the bearing was not mated to the race, or the axle was loose, it'd burn up. I have the 1965 manual, if you need any help, let me know.

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post #3 of (permalink) Old 03-11-2001, 04:48 PM
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Re: Rear Dana 44 bearing

The axel was two piece, ie tapered not flanged not the bearing . I should have been more clear. How can over lubricating cause the bearing to burn up?


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post #4 of (permalink) Old 03-11-2001, 04:57 PM
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Re: Rear Dana 44 bearing

There's only two things I can think of. Either the bearing was underlubricated or the bearing was shimmed too tight or too loose.

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post #5 of (permalink) Old 03-11-2001, 08:28 PM
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Re: Rear Dana 44 bearing

Overlubricating causes pressure to be built up which results in excess heat, causing the failure. In the industrial industry it's the leading cause of bearing failure. Were they a decent set of bearings? I'll only use Timkin or SKF.

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post #6 of (permalink) Old 03-11-2001, 08:31 PM
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Re: Rear Dana 44 bearing

If they were overlubed wouldn't the excess come out the seal preventing over pressure?

post #7 of (permalink) Old 03-11-2001, 10:24 PM
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Re: Rear Dana 44 bearing

In most cases, yes, I don't think it's a problem, just stating a possibility. I'll bet it was more like underlubrication or a contaminant. Were the bearings packed properly?

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