09-09-2016, 05:16 PM | #101 | |
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Re: Awwe Crap!
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I plan on buying my gaskets and seals from Van Pelts. In looking at the exploded view of this diff, I see that there's grease seals that mount into the hub and there also appears to be axle shaft seals in the housing. In looking at the broken axle end of the housing, I don't see a seal and the exploded view doesn't help much with location. Where is this axle seal located?
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09-09-2016, 05:24 PM | #102 |
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Re: Awwe Crap!
Capt, have you been able to remove that tapered piece of the axle that's shown above in one of your pictures? I'm wondering how tight that is/was in the hub taper? Also if/when it's out, it might be an opertunity to take a better close up shot of the fracture surface. BTW, I can see what appears to be an interesting failure pattern on the break surface of the main part of the axle that's still inside the axle housing.
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09-09-2016, 05:33 PM | #103 | |
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Re: Awwe Crap!
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09-09-2016, 06:45 PM | #104 |
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Re: Awwe Crap!
:Cap, I got some good news for you: You don't need the wheel puller because you already got it off.
...But, you will need it to pull the other wheel off. Check the other axle for cracks at the same area. Any small crack visible makes it trash, no fancy tests required, just eyeball the thing.
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09-09-2016, 07:00 PM | #105 | |
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Re: Awwe Crap!
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And to think...I had a brief thought to sell my hub puller because the box has been collecting dust for over a decade...I don't sell tools though. The one who dies with the most tools wins!
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09-09-2016, 08:01 PM | #106 |
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Re: Awwe Crap!
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"And to think...I had a brief thought to sell my hub puller because the box has been collecting dust for over a decade...I don't sell tools though. The one who dies with the most tools wins!" If you drop that dusty box on your foot getting it down off the shelf, you'll wish you were dead.
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09-09-2016, 08:41 PM | #107 |
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Re: Awwe Crap!
That exact thing happened to me on my forty as I started a left turn from a light. It turned out to be a broken axle on the drivers side right next to the spline on the wheel side. After inspecting many people said it had to be cracked for a long time. I've never even tried to lay rubber with the car. After this happened to me I installed the clips to prevent the wheel from falling off if it ever happens again.
I found an axle from a '39 and tried to use it but the spline count was different so I had to use both '39 axles and a few more parts to compensate. More than a driveway job. Definitely a heated garage and plenty of room job. I would also like to add I think the 3.78 is a great axle ratio for these cars. Since I do a lot of expressway driving I also added a Gear-Vendors O/D into the torque tube for that purpose. It brings my RPM's down to 2,600 @ 70mph. Don't give up on it, just fix it !! Let us know the progress. |
09-09-2016, 08:56 PM | #108 |
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Re: Awwe Crap!
The finest ones are the ones handed down or given or third-hand.
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09-10-2016, 12:12 AM | #109 |
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Re: Awwe Crap!
Now there you've hit a nerve. My father used to sign his name with a stick welder on all his steel tools. Small tools he used a vibrating etch pen. A few remain, and are used with a degree of reverence.
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09-10-2016, 07:47 AM | #110 |
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Re: Awwe Crap!
[QUOTE=ford38v8;1352076] I would suppose that the cause is that the machining of the keyway or splines concentrates and directs stress to the slots.
QUOTE] 38v8. You are correct. I've got a background in Structural Engineering and have been thinking about these fractures. I had asked in a previous post if this is the typical place these axles break and you indicated that it is. At the taper, the large diameter of the taper is stronger (stiffer) than the small diameter end. Torsional stresses will tend to concentrate more at the stiffer part of the taper...right where the keyway starts. The keyway has sharp 90* corners and stresses don't like to go around a sharp 90* corner...they would prefer to migrate around a rounded 90* corner. If the keyway were a steel dowel, these axles may not be breaking like this.
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09-10-2016, 07:51 AM | #111 |
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Re: Awwe Crap!
If you struggle to undo the nut and apply the puller tool, you could put the hub (complete with wheel) back on the axle, and with everything suitably chocked, undo the nut and use the puller on the axle remnant. Using the weight of the car to hold it might be the most efficient way to do it.
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09-10-2016, 07:53 AM | #112 | |
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Re: Awwe Crap!
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It's raining today...uggg...I miss my shop in Fairbanks!
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09-10-2016, 08:08 AM | #113 |
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Re: Awwe Crap!
Or a high torque impact wrench (rata tat tater) would also do the job, but I'm bettin' the ranch it ain't going to be that tight.
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09-10-2016, 08:32 AM | #114 | |
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Re: Awwe Crap!
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I rolled the broken side into the shop. With my knees on the tire and one hand on the breaker bar...a quarter turn and the stub popped right out. I've got some pics I'll share in a minute.
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09-10-2016, 08:40 AM | #115 |
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Re: Awwe Crap!
Here ya go
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09-10-2016, 08:49 AM | #116 |
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Re: Awwe Crap!
I'm not very good at stress analysis (never liked it!), but that looks odd to me. The darkened center section with the steep sides does not look like a normal failure mode (but then re-read the first sentence ).
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09-10-2016, 08:55 AM | #117 |
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Re: Awwe Crap!
The other side...also came off with one hand on the breaker bar.
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09-10-2016, 09:17 AM | #118 |
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Re: Awwe Crap!
Not having any idea of why this happens, but I know it was quite common back in my yiut. One cure was to drill a hole in the axles about 12" long. I never did this because we used 3/4 ton axles in the stick car. Now if one of you engineers out there thinks it a good idea. I have a lathe your free to use, bring your own drill.
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09-10-2016, 09:36 AM | #119 |
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Re: Awwe Crap!
Well in this case it was caused by the nuts not being torqued to the correct value (and apparently nowhere near it!). This puts the load on the keyway and not the tapper. If done correctly the keyway should have amost no load on it.
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09-10-2016, 09:55 AM | #120 |
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Re: Awwe Crap!
I agree 100%. The rear end is freed up and dropped down...now time to deal with the front of the torque tube.
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