DanielH Posted November 28, 2022 Report Share Posted November 28, 2022 Hi there, look at the tip of my mainshaft (GT6+, D-type O/D): see attached. It's pretty worn, isn't it? What shall I do with it? sand it? replace with NOS? replace with a new one? I guess NOS would be preferable but hard to find. How about the other options? Somebody followed these routes? thanks in advance Daniel Link to comment Share on other sites More sharing options...
johny Posted November 28, 2022 Report Share Posted November 28, 2022 Hi, yes Im afraid that is bad and quite unusual as Ive never seen one look like that before! Its very unlikely you can find NOS now and any used shaft will now be worn as well so theres really just two options left. Buy a new one, possibly from Bastuck in Germany, but be careful its dimensions are within the specification as shown in the workshop manual. Get the tip machined so a sleeve can be fitted for a new needle roller bearing to run on. However a lot depends on your input shaft having a good internal bearing surface? 1 Link to comment Share on other sites More sharing options...
DanielH Posted November 28, 2022 Author Report Share Posted November 28, 2022 Hello, Quote input shaft having a good internal bearing surface here is a foto of it, doesn't look that bad, no? Greetings Daniel Link to comment Share on other sites More sharing options...
johny Posted November 28, 2022 Report Share Posted November 28, 2022 yes that looks ok, not quite as shiney as I would like but maybe its still got some oil on it? Bastuck seem to have the mainshaft in stock at 183€ including VAT... Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 28, 2022 Report Share Posted November 28, 2022 mike papworth can do you a 18mm spigot mainshaft and a bored out input gear to match if you talk to him contact is in the Courier Ads tha solves any future wear out you looking for TKC 923 as the std 1/2" spigot shaft canley have them to order Pete Link to comment Share on other sites More sharing options...
johny Posted November 29, 2022 Report Share Posted November 29, 2022 I wonder how the heat treatment of the bored out input gear surface is redone? I would have thought if you heat the whole thing again you run the risk of losing the hardening of the gears... Link to comment Share on other sites More sharing options...
DanMi Posted November 29, 2022 Report Share Posted November 29, 2022 I would guess it is bored out and then a hardened sleeve inserted Link to comment Share on other sites More sharing options...
johny Posted November 29, 2022 Report Share Posted November 29, 2022 well theres a radial oil hole in the input gear that you need to lube the needle roller bearing plus as that bearing is 22mm OD you need to bore quite a big hole to fit a suitable sleeve! Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 29, 2022 Report Share Posted November 29, 2022 i used a MP 18mm kit in my box last time i rebuilt it , a previous 1/2" +needle roller idea soon failed due to lack of lube . if you wanted to change the clutch disc you could use the later rolled spline input with the 18mm spigot Pete Link to comment Share on other sites More sharing options...
johny Posted November 29, 2022 Report Share Posted November 29, 2022 Will the gear teeth of a 18mm bore input shaft (single rail Dolomite 1850) match those on a 3 rail GT6/Vitesse layshaft though? Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 29, 2022 Report Share Posted November 29, 2022 you need to ask Mike P for what he uses or suggests even canley sold 18 units but not now Pete Link to comment Share on other sites More sharing options...
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