Rear Disc Bolts - Any tips for extracting?

[Gerbs]

Trying to get the bastard bolts out is proving rather difficult. Not just the limited access but they seem to be pretty seized and require a significant amount of force to remove.
So far I’ve only got one out and snapped the torx bit in the next one. I’ve hit the others with PB Blaster and some heat but no luck.
Any tips appreciated

 

[Steptoe]

I use a long reach “impact” torx bit.

 

[Gerbs]

I use a long reach “impact” torx bit.

Do you use an impact driver too?

 

[mikeyboy]

You need to heat them up

 

[Steptoe]

Do you use an impact driver too?

No. As Mike has said. A bit of heat.
I use my gas soldering iron with the tip removed

 

[wessie]

a lot to be said for outsourcing with jobs like this ...

 

[Gerbs]

No. As Mike has said. A bit of heat.
I use my gas soldering iron with the tip removed

I was using a small jet lighter to heat the bolts up from both sides.

 

[Gerbs]

a lot to be said for outsourcing with jobs like this ...

I do enjoy spannering on my bikes but these seemingly easy jobs that turn into days can put me off pretty quickly. Luckily I don’t need the bike this week so should be able to get it sorted.

 

[Steptoe]

I was using a small jet lighter to heat the bolts up from both sides.

My gas soldering flame.

 

[MILLE_RIDER]

I have just checked that the bolts on my front discs aren't seized as I am changing the discs. It's a 2006 1200 GS which I bought new so I know that those bolts have never been touched, I was surprised how easy it was to turn them, so easy in fact I wondered if they had been torqued down properly. They haven't moved in 20 years and 80k miles so I guess they must have been adequately tightened. Maybe yours have been over tightened at some point in the past. I haven't checked the torque settings yet but I'm guessing they can't be that high because of the bobbins and a bit of loctite blue on the thread

 

[Slipperyeel]

Just done exactly this job about a month ago.
As per Mikey Boy's comment and Steptoe's precise flame...heat is a must.

Personally for small bolts like this, I use a soldering iron heat gun - super precise meaning just the bolt/screw you want gets heated. It's slower than Steptoe's gas torch, but 'safer' depending on what's around the bolt/screw (I'm thinking wires mostly, but seals also).

Really it's a job that should only be about 45min-1hr if you're cleaning things up as well, as you go.
Remember thread lock for the new screws

 

[Fiddlesticks]

Regular applications of Kroil for a few days first.

 

[Gerbs]

Well. 3 out. Heat helped. 2 bolts are firmly stuck. Snapped the 2nd long reach torx bit and now I feel a bit stuck.

 

[Burridge01]

Have you tried tapping the torx,then a smidge tightened, tap and try and release.Decent heavy duty torx,heat and a long bar.Failing that I'd be getting a gun on it.

 

[Santa-2512]

I'll ask my guy tommorow

He's doing a rear disc, front knuckle & a front driveshaft gaitor

 

[zerax9]

I did this job a couple of weeks ago... what I thought would be straightforward, wasn't. The trick is to use a good quality Torx bit of the correct size (you need a long one) and a proper ½" impact gun. I managed to mangle the head of the first one, before I sussed it out.... 4 of them rattled out easy after that, just the first one that was more of a challenge, but got it in the end... no heat required.

A classic case of having the right tools...

 

[Fiddlesticks]

I had to do it fairly recently too when Mrs Fiddlesticks put her disk lock on inside out

 

[russ996duke]

New bolts should come with correct loctite already on

 

[MotoRevive]

They are thread locked. You have to heat them to melt the threadlock.

Then they wind out nicely.

 

[Gerbs]

I did this job a couple of weeks ago... what I thought would be straightforward, wasn't. The trick is to use a good quality Torx bit of the correct size (you need a long one) and a proper ½" impact gun. I managed to mangle the head of the first one, before I sussed it out.... 4 of them rattled out easy after that, just the first one that was more of a challenge, but got it in the end... no heat required.

A classic case of having the right tools...

Yup. Impact gun is my next go to. Need to get another bit though. Bought a “high quality” set for £40 and have snapped two.