G15 Mk 2 triple tree and fork arrangement

Information relating to the Matchless G15 or AJS Model 33 750cc twin. This also includes the G15 Mk II and the G15/45
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G15 Mk 2 triple tree and fork arrangement

Postby clive » Tue Aug 18, 2020 5:33 pm

I cannot seem to find a diagram of the Norton forks fitted to my 1967 G15Mk2. The problem I am trying to sort out is the way the adjusting ring is locked. I can adjust the bearing so there is no rock but I cannot see how the adjusting ring is locked in place. When I tighten up the top nut which I assume should be the locking nut it will go tight but the adjusting ring below will still turn. It seems to me the fork crown should be lower and then act as the spacer between the top nut and adjusting nut. I currently have a 0.225 inch gap. I am wondering if the problem is the hard rubber bushes that have been fitted above the headlight ears. These are 0.4 inch and may be stopping the top and bottom of the fork crown/triple tree closing up. I do not think that I could compress the rubber bush sufficiently to close up the 0.225 gap or how to do it if that was the correct one. Picture below. ideas please, thanks in advance

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clive
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Re: G15 Mk 2 triple tree and fork arrangement

Postby cbranni » Tue Aug 18, 2020 6:24 pm

Is the bottom adjuster nut upside down?, the top fork crown should sit on top the hexagon not on the circular part, this nut is used to adjust out the play and the the upper nut is tightened down on to it. Photo from short roadholder 1961 Dommie, not sure if its same, it looks similar so may help you.
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Re: G15 Mk 2 triple tree and fork arrangement

Postby Mick D » Tue Aug 18, 2020 6:49 pm

Hi

The rubber washers on mine are a lot thinner and are of a 'beading' format which fit over the tubes - the top lug bears directly on the adjuster nut.

There are also two washers that fit outboard of the bearings which space the headstock - do you have these fitted?

I'll post a photo tomorrow if it will help - one of today's jobs was to fit the headstock.

All of the above for a G15CSR - probably the same for yours but please check

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Re: G15 Mk 2 triple tree and fork arrangement

Postby Peter Morris » Tue Aug 18, 2020 9:09 pm

Andover Norton have almost anything that wears out for G/N15's

https://andover-norton.co.uk/en/shop-dr ... ks-n15-g15

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Re: G15 Mk 2 triple tree and fork arrangement

Postby clive » Wed Aug 19, 2020 6:10 am

Many thanks everyone for the replies, also to Roy and local member David who also sent me photos offline. I am now convinced the top yolk is not sitting down properly and the reason is probably the rubbers above the headlight ears and the stanchions are pulled up too far through the lower triple tree. From Colin's photo it looks like I am also missing a spacer from steering damper too, which makes sense as I had decided it was going to need packing out with washers so it properly cleared the handlebars. Armed with this knowledge and the parts list I will be tracking down the right parts and see if I can get it all sorted. If not I will be back on here for more ideas! regards
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Re: G15 Mk 2 triple tree and fork arrangement

Postby cbranni » Wed Aug 19, 2020 7:10 am

Morning Clive,

If you closely at my photo I have put raising blocks in to lift the bars 7/8" this allows a better run for the cables over the fork tops when using straight bars but then I had to fit a spacer to allow the adjuster to clear the bars, so the spacer won't be in the spares list.

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Re: G15 Mk 2 triple tree and fork arrangement

Postby clive » Wed Aug 19, 2020 5:29 pm

Despite the slightly weird entry above I can report that the problem was entirely caused by the PO fitting a rubber encased oil seal instead of the correct rubber bush. After taking the stanchions out and removing them the crown fell into place. Parts on order from Andover Norton. I will be back when I hit the next snag!!!! :rofl:
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Re: G15 Mk 2 triple tree and fork arrangement

Postby G15 Roy » Wed Aug 19, 2020 5:59 pm

clive wrote:Despite the slightly weird entry above I can report that the problem was entirely caused by the PO fitting a rubber encased oil seal instead of the correct rubber bush. After taking the stanchions out and removing them the crown fell into place. Parts on order from Andover Norton. I will be back when I hit the next snag!!!! :rofl:


NO NO Not the PO it must have been the PPO owner. :lol:
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Re: G15 Mk 2 triple tree and fork arrangement

Postby clive » Wed Aug 19, 2020 6:18 pm

Fairdo Roy, did not mean you, after all you pointed out a number of the problems when you delivered it! :rofl:
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Re: G15 Mk 2 triple tree and fork arrangement

Postby Reynard24 » Thu Aug 20, 2020 11:01 am

My G15MkII was fitted with standard Norton fork seals above the headlamp "ears" and I refitted them when I changed the seals and seal holders and everything lined up fine. I did fit the correct rubber ones on my M18. Good fun these old bikes!

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