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Frozen lug bolt on CARC

Rafael

Rafael

GT Reference
Joined
Feb 16, 2009
Messages
1,096
Location
San Leandro, CA
I've recently bought a '6 Breva 1100 that sat outside or in a barn for at least a year and a half. I started to remove the R wheel to get at the swing arm for cleaning. But one lug won't come off. I've tried spraying through the center hole with spray lube ( rotated wheel so oil would run towards said lug) and heating the Carc through the same hole. Then using an impact wrench set a 230 lbs. And no go; also tried heating the lug then spraying more lube and nothing.

Any suggestions? My only thought is to use a bigger impact wrench. Will this shear off the bolt?

thanks, Rafael
 
Rafael,

Use a good penetrating oil. Do not heat the CARC, you may damage the seal if you haven't already. Let the oil be on the bolt for a week or so. Then heat the bolt and use a big (air) impact wrench. The bolt has to come off. If it shears, remove the CARC and use a machine shop to get the bolt out of the CARC. I know electro erosion will always work if the machine shop doesn't want to touch it.
 
Thanks John, I’ll pick up some Liquid Wrench I think WD 40 is mostly kerosene. I was careful with the torch, the CARC never got hot to the tough, just a little warm. Luckily I don't need to change the tire, I can wait a week.
 
I've found a product called YIELD works well on uncoperative nuts n bolts. Comes in an aerosol can. A good sharp blow with a heavy drift end on could also help but i would assess the implications of such first. Good luck!!!
 
Dis-similar metal corrosion.

Tighten the bolt just a little bit first. it will be a little tough, and you will hear a very high pitched crack as the corrosion breaks loose, but then it will loosen out easy..

I cant tell you why tightening the bolt fixes the problem, but it does.
 
Follow up:

I drop by a nearby auto shop. They were able to spin it right off on the first try. I heated the bolt a bit and it had been soaking a few days with penetrating oil. Their impact wrench produced about 3xs the amount of torque than mine; +-750 lbs. I didn't find much corrosion; it was probably over torqued as well.

Thanks All, Rafael
 
FWIW you will never see the corrosion. it's a bond that goes down to the molecules.

Glad they were able to get it off. Next time, try tightening it first, you would be amazed.
 
Brian UK said:
Next time try a small amount of grease on the threads before assembly.
Click to expand...

That will change the torque value. My opinion is that one bolt was over torqued to begin with. I just took a little more power to get it off than the others.
 
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