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Post by Uralee on Mar 15, 2018 8:41:41 GMT 10
Andy, the rolled or formed threads are rounded and often with a flat on top of the thread. Cut threads are a V shape. The disc retaining bolts and the spline hub bolts would / should have loctite on them......looks like white powder when bolt removed.
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Post by brucek on Mar 15, 2018 12:26:27 GMT 10
Thanks - that is good to know, Will have to see if I can get away with that on the sidecar disk bolts, The appear to be half head too. Yes, fit them if you can. I had the same difficulty with the disc screws as the drive spline screws on my 2015 Ranger, only worse because the disc rotors were held on with button head cap screws which have an even smaller hex (5mm AF). I've since replaced my disc rotor screws with low head screws which have a 6mm hex but realised later I could have fitted std cap screws, there's plenty of clearance for the extra head thickness. Also, I've not applied any thread locker to the drive spline or disc rotor screws. When I replaced them I applied a some Loctite Anti-sieze instead which I think is a good thing for screws going into aluminium. Some might not agree but I haven't had any work loose. It's little detail things like this which can be a big help with later strip downs. One last thing to look out for is to make sure the screws are long enough. Rough rule of thumb for screws going into aluminium is to have two diameters of engagement. I.e. an 8mm screw should have 16mm of thread entering the tapped hole.
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Post by maccaoz on Mar 15, 2018 16:30:07 GMT 10
The Ural button head cap screws are as bad as the jap cheese heads of old. I have changed every bolt on my RD350LC to Allen head and I don't care if it's not dead stock oridiginal (all the green Yamaha cheese bolts have been stored away for posterity )
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andyh
2015 Tourist
Posts: 953
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Post by andyh on Mar 21, 2018 8:40:02 GMT 10
Std cap head screws can fitted to the sidecar disk (x5) as well. There is about 7mm clearance to the swing arm as opposed to the original 10mm. If the disk moves closer to the swing arm then you will have bigger problems than the heads striking. Guessing the same goes for the sidecar drive spline rotor but those are going to be saved for a rainy day. Initial attempts to get them out have failed and I don't want to force them just yet. I might dig out a 1/4 inch key and see if that allows a bit more bite. My Bolts and Industrial supplies guy at Virginia has 12.9 as standard.
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