Wheel stud removal

[bike grim]

Possibly been discussed before but a quick search revealed nothing. I was trying to update my MB outboard Disc wheel studs to fit SIP rims and the obvious happened.. I broke a wheel stud. None of them will budge and it's probably a no hoper but an engineer told me he could bore them all out and re tap if I supplied the appropriate reverse thread tap. Anyone ever done this before? It's a shame to bin an otherwise great front brake set up just because of the wheel studs.

[HxPaul]

I'm not very sure about the hub studs on your scooter,but if there the same as standard hub studs,the heads on the studs are difficult to get a spanner on them.I've got some standard ones out by gripping them in a vice.I first soaked them in WD40 for a couple of days.

[Warkton Tornado No.1]

Sod your luck.

You can only try & accurately drill out the remnants so the original LH thread remains in the alloy hub.

It is possible but takes patience & accuracy.

Drill a dead centre pilot hole & gradually increase the drill size until a thin walled tube remains & then you can usually collapse that inwards to be tempted out. Loads of penetrating oil helps, as will heat. WD40 is not a true penetrating oil. It is moisture dispersant.

Despite what you’ve been told, you cannot ‘re-tap’ back to the original size without welding the hole or heli-coiling.

[bike grim]

Yes they are the same as standard, the MB disc just used a modded standard hub.



They aren't budging at all with heat, wd40, vice, locking 2 nuts to push it out whilst using a ground down 12mm socket on the head to help it along ( how I snapped it) thought about getting someone to weld a length of bar to it to add some leverage. But I need all 4 of them out really so the drilling then re tapping or even helicoil seemed a good idea if I could get hold of the left hand thread tap or helicoil kit?

[bazza3004]

Did a rear hub couple of years ago. 3 came out no problem but typically one was not for budging no mater how i tried. I finally thought sod it and cut the stud off level with the hub lug then drilled it out with a slightly larger drill each time and as said previously once thin enough i was able to tap the remaining thread inwards with a dot punch. Good luck.

[bike grim]

Thanks for the advice, I'll try and get on a mates pillar drill and have a go. Fingers crossed.

[holty]

another good way is to drill out so far, then weld a bolt onto the side where the socket fits, should come out easy, providing you have a welder of course.

[terryj]

i had a broken stud in an head set removed once using a spark eroder and never damaged headset or threads so if you know a friendly tool maker

[Warkton Tornado No.1]

Post by bike grim » Wed Aug 03, 2016 8:08 pm

or even helicoil seemed a good idea if I could get hold of the left hand thread tap or helicoil kit?

Helicoil thread inserts are very common in certain industries such as Aerospace & Motorsport where alloy castings will have them fitted from the outset.

‘Our’ more common metric threads tend to be all RH such as M8 x 0.5, M6 x 1.0, M7 x 1.0, M8 x 1.25 & the M14 x 1.25 spark plug threads. Even I have Helicoiling equipment for those sizes.

The more universal kit sizes are often much more obtainable (& cheaper!) than the more unusual M10 x 1.0 LH hub hole size.


If all else fails, Beedspeed appear to do an oversize hub stud that utilises a Whitworth thread.

https://www.beedspeed.com/lambretta-stud-oversize-p-8195.html?osCsid=1556si5anv42c3orrjom4ouhg1

[bazza3004]

another good way is to drill out so far, then weld a bolt onto the side where the socket fits, should come out easy, providing you have a welder of course.

Thats good advice.

[Knowledge]

The only time I tried this technique, the stud was so hard, it didn't take the weld: the metal of the stud just seemed incompatible with the weld rod (wrong melting point).

Having said that, I would try it again in your circumstances.

[bike grim]

Great news, a fellow club member has come to the rescue and removed all of the old studs by welding a flat bar to the bolt heads and turning them out ! Result. Thanks for all the help and suggestions

[Digger]

Result... Well done that man

[corrado]

Great stuff, I no longer feel responsible.

[Wack]

Right or wrong I always copper grease hub studs in to prevent them seizing.

[bike grim]

Great stuff, I no longer feel responsible.

Hahaha