Crank arm pinch bolt

[Honkdonk]

Easy out 

Even for a countersunk crank arm pinch bolt? Do they make EZ Out in that size?

[V12man]

Dunno hey.. I take Anton's word for it if **** gets real

 

There are a couple.of ways of removing that in the order I would try:

 

Left handed drill

Bolt remover - like a fine splined torx wrench designed to be hammered into a round hole

Easy out - these are a bugger if they break - so make sure you get a high quality set

Dremel to cut screwdriver slots and use an impact wrench to undo it with a screwdriver bit.

Build it up with a tig welder - this I would get my engineering mate to do

Use a spark eroded to remove the remnants of the above- hard to do because that is still attached to the frame and I am not sure if it would all fit under the only spark eroder I know of.

[Honkdonk]

 

There are a couple.of ways of removing that in the order I would try:

 

Left handed drill

Bolt remover - like a fine splined torx wrench designed to be hammered into a round hole

Easy out - these are a bugger if they break - so make sure you get a high quality set

Dremel to cut screwdriver slots and use an impact wrench to undo it with a screwdriver bit.

Build it up with a tig welder - this I would get my engineering mate to do

Use a spark eroded to remove the remnants of the above- hard to do because that is still attached to the frame and I am not sure if it would all fit under the only spark eroder I know of.

I am going to asses the situation with him on Friday..

 

Damn it man. Last thing I need.

[Eugene Brown]

 

There are a couple.of ways of removing that in the order I would try:

 

Left handed drill

Bolt remover - like a fine splined torx wrench designed to be hammered into a round hole

Easy out - these are a bugger if they break - so make sure you get a high quality set

Dremel to cut screwdriver slots and use an impact wrench to undo it with a screwdriver bit.

Build it up with a tig welder - this I would get my engineering mate to do

Use a spark eroded to remove the remnants of the above- hard to do because that is still attached to the frame and I am not sure if it would all fit under the only spark eroder I know of.

Soak hole overnight with penetrating oil. Drill 2, then 2.5, then 3, then 3.5mm holes through bolt head, and use easy out slowly, the same way you would a tap i.e loosen out a bit, run forward a bit, loosen out a bit, run forward a bit until bolt is free. That would be the most extreme, normally just drill 2.5mm hole and easy out (even with Midas quality-level easy outs)

Worked for me over many years on aircraft, bicycles, forklifts and earth moving equipment, so you should be OK.

[V12man]

I am going to asses the situation with him on Friday..

 

Damn it man. Last thing I need.

Not as bad as my mate who stripped the splines on his XTR crank because that Bolt was not fastened properly... it is fixable but not economically sensible to fix it...

 

I can help you with the first 4 or so... then point you at a couple of specialists if you get stuck beyond that.

[V12man]

Soak hole overnight with penetrating oil. Drill 2, then 2.5, then 3, then 3.5mm holes through bolt head, and use easy out slowly, the same way you would a tap i.e loosen out a bit, run forward a bit, loosen out a bit, run forward a bit until bolt is free. That would be the most extreme, normally just drill 2.5mm hole and easy out (even with Midas quality-level easy outs)

Worked for me over many years on aircraft, bicycles, forklifts and earth moving equipment, so you should be OK.

I never start with an easy out.. broken a couple in awkward spots before... that Bolt has a fair amount of torque applied to spec tightness - I wouldn't be surprised if that has been a touch over tightened too...

[ichnusa]

Remember to put the other side's bolt in and tighten it nicely before trying to remove the stripped bolt.  It will take some of the pressure off the stripped bolt so that it releases more easily.

[Eugene Brown]

Remember to put the other side's bolt in and tighten it nicely before trying to remove the stripped bolt. It will take some of the pressure off the stripped bolt so that it releases more easily.

Really good point. Also, if it's seized dead, maybe start drilling a 3mm hole from the bottom end ie opposite the head. When the bit bites, it may help to break the seize.