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MK3 rear axle

Classic Norton Commando Motorcycles.

MK3 rear axle

Postby madass140 » Thu Aug 03, 2017 3:13 pm

I've been asked a few times about a one piece axle for MK3, I dont have a MK3 rear wheel or parts at my disposal
only the parts drawing to go by, so hence a couple of questions.
The main axle is 17mm apparently
The stub axle is also 17mm but has a 9/16" thread, so what is the thickness at the 2 flats where it locates in the swingarm?
it appears it is a lot less than 17mm?
The axle slots in the swingarm are both the same size? 17mm or ???
Don
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Re: MK3 rear xle

Postby L.A.B. » Thu Aug 03, 2017 3:28 pm

madass140 wrote:The axle slots in the swingarm are both the same size? 17mm or ???


Approximately 17mm (RH) and 14.4mm (LH).
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Re: MK3 rear xle

Postby madass140 » Thu Aug 03, 2017 3:50 pm

thanks, so the chain adjusters are different?
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Re: MK3 rear xle

Postby L.A.B. » Thu Aug 03, 2017 4:49 pm

madass140 wrote:thanks, so the chain adjusters are different?


No, they are the same.

Although the dummy axle has flats, I'm guessing the shaft diameter is also (approx.) 17mm.

https://andover-norton.co.uk/en/shop-de ... dummy-axle

I hope this makes sense.
The flats on the dummy axle are wide enough to allow the shaft (so 17mm x 14.4mm section, approx.) to pass through the LH inner adjuster plate, swingarm axle plate and also protrude slightly beyond the LH outer adjuster plate which is why the thick washer 06-5984 is required.
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Re: MK3 rear axle

Postby madass140 » Thu Aug 03, 2017 6:38 pm

06-5984 is the washer for the right side.
If the flats on the dummy axle is approx 14.4mm then it would not be able to do its job if the adjuster and swingarm slot is 17mm or am I missing something?
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Re: MK3 rear axle

Postby Mr. Rick » Thu Aug 03, 2017 10:33 pm

The LH swingarm slot is not 17.. It's 14.4 or so, as Les mentioned earlier.
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Re: MK3 rear axle

Postby madass140 » Thu Aug 03, 2017 11:38 pm

ahh, ok, getting clearer now.
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Re: MK3 rear axle

Postby norcomm76 » Fri Aug 04, 2017 1:05 am

I can send you a drawing of the axle Mk3 either in dwg or in pdf.

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Re: MK3 rear axle

Postby L.A.B. » Fri Aug 04, 2017 1:07 am

madass140 wrote:06-5984 is the washer for the right side.


The Mk3 rear wheel parts book drawing is not accurate, there should be two "27" washers, one under the nut, the other under the hexagonal head of the spindle/axle.

Mk3 parts book rear wheel list;

"27....06-5984....Washer....2.."
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Re: MK3 rear axle

Postby madass140 » Fri Aug 04, 2017 1:26 am

well that makes it a bit clearer. Well from what I can see, the only way to fit a one piece axle is to revert to a 9/16" axle which in
one way a step backwards going to a smaller diameter and it would entail different bearings and spacers . All a bit cost prohibitive.
If I had my own MK3 I may consider a one off for myself at bugger all cost. I think we have to shelve this idea for the time being.
Are the MK3 axles known for problems, I've never heard of any.
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Re: MK3 rear axle

Postby cliffa » Fri Aug 04, 2017 2:18 am

Hi Don,
as a relative newbie to Commando ownership, can I ask what the benefits of the one piece axle are?


Cheers,

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Re: MK3 rear axle

Postby kommando » Fri Aug 04, 2017 2:48 am

can I ask what the benefits of the one piece axle are?


With the 2 piece axle the longer axle can snap at the transition from plain shaft to the end thread right at the root of the first thread. By going to single piece axle you remove the weak point.
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Re: MK3 rear axle

Postby madass140 » Fri Aug 04, 2017 3:03 am

some may not agree but many have had axle breakages because of a combination of things, such as , not the best design having a relatively
small diameter axle (9/16") and threading it in to the other half of the axle assembly (the stub axle) sometimes these threads will strip or
the long axle will break at the end of its thread, remember that the root diameter of the thread is only about 1/2" so it doesnt take much
ill fitment to put stress on the axle. It is not the best design and that combined with incorrect fitment can often lead to problems.
My one piece axle does away with the stub axle and the long axle passes right thru , like any normal axle, I make the thread end just before it
clears the swingarm outer plate so there is no weak or vulnerable point that is liable to break. ie: there is no threaded portion of the one piece axle
within the inner width of the swing arm.
I dont think adjusting the chain with the axle adjusters is doing the 2 piece axle design any favors.
I'm sure others will chime in with opinions how they have never had an issue with the standard setup, I havent. but I believe one axle is better than two.
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Re: MK3 rear axle

Postby cliffa » Fri Aug 04, 2017 7:17 am

Makes sense, especially if it's only 1/2" at it's thinnest part :shock:

Thanks both for the explanation. I'll be checking mine.

Cheers,

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Re: MK3 rear axle

Postby manx850 » Fri Aug 04, 2017 10:24 am

I had one break almost in two, a lucky find.......one piece sounds a lot safer in my opinion, considering how many times they have been removed and replaced!...........

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