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AMC 20 axle replacement - length |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6884 |
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Seems like an ongoing issue.
Has anyone tried taking the hub to a machine shop and have them bore out the taper, press in a new piece of similar cast and machine a new taper and key way? A good press fit of 0.002" to 0.004" (guess) should never let go. Can look that up (or calculate) in the Machinery's Handbook for the press fit depending on bore, material and torque. Although solid axles may be cheaper! |
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SentencedToBurn
AMC Fan Joined: Dec/09/2017 Location: New Zealand Status: Offline Points: 21 |
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Hey sorry for late reply mate, we had a bit of stuff going on here. I didn't realise that about the hubs, will keep that in mind. Will get the old hub first, and will see if the splines match i.e. the number etc and the condition of them. And if any doubt I'm thinking of just replacing both with solid axles and if the bolt pattern doesnt match then I'll just chuck different wheels on the back and be done with it. Except then I gotta sort the brakes too, so will see if this old hub will be ok for now.
Edited by SentencedToBurn - Mar/19/2019 at 1:52pm |
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SentencedToBurn
AMC Fan Joined: Dec/09/2017 Location: New Zealand Status: Offline Points: 21 |
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That would be a great option but as you say sounds like it's a bit of work, solid axles might end up being cheaper. Except in my case where then I'd need to change the brakes too since i'm running 5x4.5 bolt pattern and all replacements seem to be either 5x5 or 5x5.5 which means i'd need to change brakes too.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19679 |
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When you put the used hub on torque it to 250 foot lbs then measure the
axle stick-out from the outer edge of the hub. Should be 1.30" on the
AMC 20 (1.17" on AMC 15). This is from the 74 TSM.A slight bit more should work, you will have to check for brake shoe and drum/backing plate interference. There could be hub/seal interference, but I do know several people have re-used spun hubs over the years, so I don't think that is an issue. There are ways around the issues. I know one guy who cut the backing plate and made it a little deeper. A good bit of tricky welding (has to be even all the way around), but he was a good welder and it worked. IIRC he said it had to be around 1/8" deeper to work with the spun hub. He reused the spun hub after cleaning the axle splines, not a different hub. Don't recall if someone split a second backing plate and mounted it behind the axle flange or that was just discussed (you'd need to cut the center out of one backing plate to hold the axle and seal). All that is transparent once installed, and cheap if you can do it. It also works fine as long as the hub is torqued properly. The end of the axle sticks out that much further, and it could interfere with a hubcap, but I don't think it would. I recall someone talking about grinding the edge of the drum or backing plate. Grinding the drum could cause balance issues, and the brake shoes may contact the inside of the drum doing either of those. Might be plenty room inside for another 1/8" or so back though... |
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Frank Swygert
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3806 |
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The factory had a shim for this; it went on the hub and spaced the drum out. It is similar to the 65-70 front disc Magnum wheel shim but IIRC its thinner, maybe .06 thk for the rear.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19679 |
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Didn't know that!! Why I didn't think of just shimming the drum I have no idea... sometimes the simple and obvious eludes people... it HAS to be more complicated than that, doesn't it? I've never even heard of anyone using a (pretty obvious, really!) shim, just the more dramatic solutions mentioned. 0.06" would be about right -- about 1/8"...
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Frank Swygert
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