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Rear axle modification?
#809397 05/19/20 12:21 am
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DavidP Offline OP
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I recently had the nut come loose from my rear axle. Good thing I was riding in a straight line at low speed.
That got me thinking. Would it be wise to use a castle nut and drill the axle for a cotter? Or would this only weaken the axle?


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71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
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Re: Rear axle modification?
DavidP #809412 05/19/20 1:53 am
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Well, I wouldn't think that a hole in the part of the axle that was outside the nut, and thus not bearing any load, would weaken anything. You'd have to drill it carefully with a jig to make sure it went through the center of the axle, and find a castellated nut of the right size and thread, but it sounds like it would work.

Or clean up the threads good, and use blue Loctite ....

Good thing that you didn't get hurt. When that axle falls out of one side, it COULD steer you right into the other lane or over the edge!

Lannis


"Until it's safe" means "Never".
Re: Rear axle modification?
DavidP #809427 05/19/20 4:37 am
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Rural King actually stocks two options in 5/8" UNF, a castellated nut and a nyloc. Lacking a proper jig, I'll probably opt for Loctite and nyloc nut. And check the darn thing before every ride when I check tire pressure.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
Re: Rear axle modification?
DavidP #809430 05/19/20 5:00 am
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Drill a hole through the nut only and lockwire it.
Rob C

Re: Rear axle modification?
DavidP #809440 05/19/20 8:06 am
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David, the nut for the rear axle on the oif is same as the swing arm and should be of the self locking type. Simply if you can thread that not on past the hex portion by hand then it’s junk for that application and get another one.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
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Re: Rear axle modification?
DavidP #809466 05/19/20 1:43 pm
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Earlier models, including my '69 T120R use plain nuts on the rear axle. The WS manual doesn't list a torque setting. I wonder how tight others are making these nuts? I use a bmf wrench and two grunts. Might be the only fasteners that have never come loose on my bike.


Bruce Miller
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The Bonnie Ref: https://www.hermit.cc/tmc/om/manual.htm
Re: Rear axle modification?
DavidP #809467 05/19/20 1:54 pm
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The figure for the these particular axle nuts is 90 foot pounds

Re: Rear axle modification?
DavidP #809482 05/19/20 3:15 pm
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Thank you, John. I'd picked up a figure of 100 somewhere, but it sounded kinda high. Ninety pounds it is and two grunts should do it!


Bruce Miller
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The Bonnie Ref: https://www.hermit.cc/tmc/om/manual.htm
Re: Rear axle modification?
John Healy #809552 05/20/20 4:43 am
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Originally Posted by John Healy
The figure for the these particular axle nuts is 90 foot pounds
Might be nice if Triumph had seen fit to put this spec in the General Data section of the WSM. I might have used a longer handle to tighten the nut.
Deez nutz!


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
Re: Rear axle modification?
DavidP #809661 05/20/20 7:17 pm
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There is no force trying to loosen the axle nut, I would suggest it was never tightened in the first place


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Re: Rear axle modification?
DavidP #809667 05/20/20 7:57 pm
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More important yet, is to keep the "nut" on the seat stable

Re: Rear axle modification?
DavidP #809702 05/20/20 10:38 pm
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Originally Posted by DavidP
Originally Posted by John Healy
The figure for the these particular axle nuts is 90 foot pounds
Might be nice if Triumph had seen fit to put this spec in the General Data section of the WSM. I might have used a longer handle to tighten the nut.
Deez nutz!

I suspect that if you can get a nice Nylok nut in that size, it will be just the thing.

Lannis


"Until it's safe" means "Never".
Re: Rear axle modification?
Lannis #809766 05/21/20 5:40 am
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Originally Posted by Lannis
I suspect that if you can get a nice Nylok nut in that size, it will be just the thing.

Lannis
Already got one. Triumph actually converted to universal threads. Not as if I had to find some weird 20tpi nut.
90 lb-ft will be a bit difficult to loosen if I ever have a flat on the road though.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
72 T150V "Wotan"
Re: Rear axle modification?
Lannis #809794 05/21/20 12:04 pm
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Originally Posted by Lannis
Originally Posted by DavidP
Originally Posted by John Healy
The figure for the these particular axle nuts is 90 foot pounds
Might be nice if Triumph had seen fit to put this spec in the General Data section of the WSM. I might have used a longer handle to tighten the nut.
Deez nutz!

I suspect that if you can get a nice Nylok nut in that size, it will be just the thing.

Lannis

A nyloc only has limited on/off use before it becomes just a plain nut. I believe the original were the same principle as a stover nut where the top of the head is deformed which performs the locking action.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Rear axle modification?
Allan G #809809 05/21/20 1:27 pm
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Well'ard Rocker
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Originally Posted by Allan G
Originally Posted by Lannis
Originally Posted by DavidP
Originally Posted by John Healy
The figure for the these particular axle nuts is 90 foot pounds
Might be nice if Triumph had seen fit to put this spec in the General Data section of the WSM. I might have used a longer handle to tighten the nut.
Deez nutz!

I suspect that if you can get a nice Nylok nut in that size, it will be just the thing.

Lannis

A nyloc only has limited on/off use before it becomes just a plain nut. I believe the original were the same principle as a stover nut where the top of the head is deformed which performs the locking action.

Three or four of them will last the average rider with average tire life 10 or 15 years, I'd think. At our time of life, if we use up our stock of nuts, we can happily make a new plan then!

Besides, the same thing is true of any device used to hold a nut in place. Lock-wire, cotter pins, bendable tab washers - they're all use-once disposable wear items. Nylok nuts can be used 5 or 10 times before they just spin ...

Lannis

Last edited by Lannis; 05/21/20 3:28 pm.

"Until it's safe" means "Never".
Re: Rear axle modification?
DavidP #809852 05/21/20 6:30 pm
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All the trucks and cars I have worked on have used a castellated nut and a cotter pin to guarantee that the front wheel would not escape from it's mounting spindle.

Doing the same for both ends of a Triumph rear axle seems like a good idea to me. Carrying few extra cotter pins in the tool kit won't take much room.


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