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1960 Dominator 99 clutch centre spider replacement.

Submitted by john_grieveson on Thu, 12/12/2024
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Heavy Twins

I have bought a 1960 Dominator 99 and dismantled the clutch to find the clutch spider centre is in a worn condition and is a sloppy fit on the gearbox spline's. I can't source a replacement spider anywhere and wonder if any members have a spare they wish to sell or can advise me where I can buy one. Are there any alternatives to solve this problem?

Submitted by robert_tuck on Thu, 12/12/2024

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I have bought a spider from RGM in the past and they also may have "seconds" that will suffice . Send an E mail if not on the web site.Andover Norton also have them (at a price!). I would only use 50 ft  lbs torque +nutlock when refitting the clutch to avoid crush damage to spline register / stop in spider.Also the biggest overall diameter and close fit to shaft spring washer that will go in the recess to support the end of the spider .Some spiders are weak in this area

Submitted by john_grieveson on Thu, 12/12/2024

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Thanks for the information I looked at those websites and there out of stock. I'll do as you say and email them too. On the subject of torquing the nut I have noticed the outer spline showed signs of friction heat and the spider was worn with the contact, the design seems odd to have two shafts (inner and outer) running at different speeds against each other. Am I missing something?

Submitted by robert_tuck on Thu, 12/12/2024

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The back of the spider gets very close to the end of the sleeve gear ,but there must be clearance . and when the spider register (stop detail) at the nut end gets tired from being done up to 70 ft lbs , it can spread and start climbing up on the shaft ,this usually manifests itself by resisting efforts to remove the clutch which then needs a puller. A new spider should sort this but sometimes needs a bit ground off the back of the spider to give clearance to the sleeve gear, or another possibility ? a shim inside the spider up against the register , not tried this myself. There are those who say it does not matter if the spider drags the sleeve gear.  All i know is that when right you get the best  box action possible . A gentle snick into first and always find neutral easily  and a snappy gearchange.

I think I see the problem? The spider on my bike doesn't have anything to stop the nut contacting the splines directly, the splines go all the way through the spider to the nut, there is no shoulder before the nut. There is nothing to stop the spider travelling all the way to the outer shaft (rear wheel drive sprocket shaft). Am I right in what I'm thinking.
Many thanks Robert.

Submitted by robert_tuck on Thu, 12/12/2024

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Exactly, its total scrap. Some spiders have a full circle register (the best type). Poor ones have a segmented register that will spread in time and fail, you will soon be able to appreciate what a good box your Norton has.keep a sharp lookout and study everything , old bikes are full of small issues that are solvable with patience. satisfaction is earned !

Thank you very much Robert, no wonder I couldn't understand haw it could work. I have solved multiple issues on this bike, first classic bike, but I have learned so much and now like the bike and have a connection with it. Thank you once again for your help, what a great web site this is too.

Submitted by tony_gill on Thu, 12/12/2024

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SORRY  it out of stock . Andover Norton have them but very pricey .  Check with NOC fo a lead time  im very sorry

 



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