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03-09-2015, 05:49 PM | #1 |
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Repairing striped rear axle threads
While reassembling the left brake drum during the Barners Bash at Vic Ps the axle nut on the left wheel would not come up to torque.We stopped tightening the nut and put the cotter pin in, and completed the tour.Now that I am home I was in the process of replacing all 4 wheel cylinders.Upon removing the axle nut I found that the axle thd was stripped.Rather than pull the axle I have decided that I will attempt to rethread the 5/8-18 thd. to 9/16-18.I locked the brake on the opposite wheel and started the engine in reverse raised the rpm of the engine and filed the bad thd till the shaft measured .562.The whole process took about 10 min.I have a 9/16-18 thd cutting die due in tomorow,and with a little care I will be able to rethread the axle.I don,t feel that the 5/8 to 9/16 change in size will make much difference in the strength of the axle.Phil
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03-09-2015, 06:15 PM | #2 |
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Re: Repairing striped rear axle threads
To give you an idea of the difference in Torque values, one set of values for a 5/8 grade 8 bolt is 230 ft-lbs, from the same source a 9/16 grade 8 bolt torque value is 169. That is a fairly large difference, a 26.5% decrease.
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03-09-2015, 06:20 PM | #3 |
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Re: Repairing striped rear axle threads
That is more than I would have thought.But still should do the job. Thanks Phil
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03-09-2015, 06:23 PM | #4 |
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Re: Repairing striped rear axle threads
Would at least suggest safety retainers, even stock ones break.
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03-09-2015, 06:28 PM | #5 |
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Re: Repairing striped rear axle threads
For such a beautiful car, I wouldn't cheapass. Get a new axle, it will ease you mind on every right-hand curve.
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03-09-2015, 06:31 PM | #6 |
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Re: Repairing striped rear axle threads
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03-09-2015, 07:38 PM | #7 |
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Re: Repairing striped rear axle threads
Speaking of retainers ,any one have them fitted to hubs with mechanical brakes?
Lawrie |
03-09-2015, 08:02 PM | #8 |
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Re: Repairing striped rear axle threads
I would doubt that the axle is case hardened! Case hardening is normally used for wear applications not for torsional flexing.most likely it is made from a alloy such as 4130-4140 heat treated aprox. 48 RC.Phil
Last edited by trainguy; 03-10-2015 at 02:38 AM. |
03-09-2015, 08:16 PM | #9 |
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Re: Repairing striped rear axle threads
Lawrie, I have often thought about the same thing. If you come up with a way to do this, let us know how you did it. Driving these 80+ y.o. cars all over Gods creation, we never know when an axle might snap, and we have a tire, wheel, drum and hub go flying past us
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03-09-2015, 09:14 PM | #10 |
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Re: Repairing striped rear axle threads
trainguy>>>While reassembling the left brake drum during the Barners Bash at Vic Ps the axle nut on the left wheel would not come up to torque. We stopped tightening the nut and put the cotter pin in, and completed the tour.>>>
I'd sorta like to know 3 things. Why was it disassembled in the first place? How much tork was applied while reassembling? And how do you suppose they got stripped? Thanks. Jack E/NJ |
03-09-2015, 09:20 PM | #11 |
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Re: Repairing striped rear axle threads
It wast taken apart to fix a wheel cylinder that was not releasing,the threads started yielding at about 125 ft lbs. I have no idea how it got stripped.This was the 1st time I had the wheels off the car.Phil
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03-09-2015, 09:28 PM | #12 |
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Re: Repairing striped rear axle threads
trainguy>>>the threads started yielding at about 125 ft lbs.>>>
Thanks. What you're planning to do seems way better than the way it was. Carry on! 8^) Jack E/NJ |
03-09-2015, 09:40 PM | #13 |
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Re: Repairing striped rear axle threads
The main function of the nut is to lock-up the taper thus taking the load off the key and to keep the hub on the axle.It really has little to do with the strength of the axle.A loose nut usually causes a sheared key and or worn key way,not a broken axle.Phil
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03-09-2015, 09:56 PM | #14 |
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Re: Repairing striped rear axle threads
A loose nut is usually the root cause of a broken axle.
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03-10-2015, 01:20 AM | #15 |
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Re: Repairing striped rear axle threads
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03-10-2015, 04:04 AM | #16 |
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Re: Repairing striped rear axle threads
Don't over analyze..! How many of you boys,have ever broke an axle on a V8 ford?
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03-10-2015, 05:25 AM | #17 |
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Re: Repairing striped rear axle threads
I totally endorse your repair choice because I have followed the same procedure on several axles. NONE of which have since failed. If the axle taper is a reasonable fit within the hub there will never be a problem. If the taper is a poor fit, a 3/4" thread diameter won't save it.
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03-10-2015, 06:50 AM | #18 |
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Re: Repairing striped rear axle threads
You could help mitigate the situation by ensuring the hub is a good "wringing" fit on the taper by lapping it in with grinding paste, as described on this forum many times in the past.
Mart. |
03-10-2015, 06:56 AM | #19 |
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Re: Repairing striped rear axle threads
Yes, I agree with you, Mart. If you're not going to tear the rear end apart to properly repair this issue at least get some valve-lapping compound and make sure the tapers match as well as possible. Heck, this is something we should all do to ensure a good fit between these critical surfaces. I did it with my car; it's cheap and only takes a couple minutes.
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03-10-2015, 07:00 AM | #20 | |
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Re: Repairing striped rear axle threads
Quote:
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