rear disc mount bolt

[mr wayneker]

ive just got round to addressing the annoying rubbing I have in one spot on the rear disc
and noticed that one of the mounting bolts just spins when at the bite point....so that might be the reason why there
is a slight rub on the rear brake pads???

its an Armstrong wavy disk....but want to change back to a more standard round disk
so what im asking is will this one bolt realy matter and can I just lock tight it up

or shall I just get a new/second hand rear wheel?????
or is it worth getting the thread done on the wheel I already have???? :rolleyes

oh and does anyone know the torque on the rear torque arm bolts??

[Freck]

I'd say it's more than likely that the disc has warped slightly over time because of the bolt which is spinning.
There won't have been enough or rather equal tension at that point allowing flex in the disc. Much like a cylinder head which isn't tightened down correctly and will eventually warp and fail at that point.


As for the wheel, it might be worth trying to helicoil the offending bolt hole first, you may be lucky if the alloy hasn't deteriorated much.


Steve

[Freck]

Sorry, missed out your last query  :rolleyes
If you don't have one, you can get the Haynes manual in the Downloads section, may have the info you need.
I'd have a look in mine for you but I'm 4000 miles away from home at the moment  :lol  and no, I'm not having a really long ride out  :rollin

[mr wayneker]

hi freck

yeah prob warped although it was only put on last mot(sept 14) yeah I know doesn't mean it cant warp

and the last owner has had the wheels off front and back and had them re sprayed so now im wondering if
he hasn't bent the spindle by over tightening like he has the disc bolts??? and or crushed the swing arm in a little
the washer looks to be a bit concave to me...

yeah ive got all manuals and books but cant find it....lol....that is a big ride out :lol 

[bandit]

Rear arm torque bolts are 23NM.

[mr wayneker]

cheers bandit same as the disc bolts then

[Lumpy]

get a helicoil fitted it'll be fine. I would do all of them as they are probably worn if gorilla did them up.

[mr wayneker]

would you happen to know what size heli kit I would need

[His Dudeness]

The bolts are M8x1.25 according to the manual but bring the wheel and the bolt to a machine shop and he'll stick the right one in for you