Crank case bolt removal

[JPR]

Any ideas on how to remove a crank case bolt that the head of the bolt has twisted to a spiral ?

[suck my wake]

Start drillin!!! You can start with small bits and work your way up till you basically drill the head of the bolt off then when you get the case's apart you can use some vise grips to remove the rest of the bolt. It's a PITA but it works. Goodluck

[JPR]

Aww man, I was hoping there was a better way ! Thanks for the reply.

[suck my wake]

Is it one of the outer case bolts or one under the plug? If it's an outer you can use a cutoff wheel to get most of the bolt head off but if it's under the plug then the drill way is the only way I would do it.

[JPR]

I wish it was an outer ! Was thinking of heating it up and smacking on a size down torx socket but am worried the heat will disturb the case. Drilling may b my best option..

[skoepp]

That sucks, been there done that.
I tried everything imaginable and ended up having to drill it out, was a total pain in the axx.
Do what ever possible to start the first bit in the middle of the bolt.


All i can say as whenever you try break loose the main case bolts always use a brand new or perfect socket that is high quality with good bite and apply alot of pressure to be sure does not slip even once.

[JPR]

Cheers fellas. A 11mm socket was my friend along with a hammer but it's ok the socket survived !!!!!

[skoepp]

Cheers fellas. A 11mm socket was my friend along with a hammer but it's ok the socket survived !!!!!

Glad that worked out for you.
Sounds like it luckily wasn't totaly rounded off.
That bolt is a pita when gets striped.

[01xdime]

Good lord please dont talk about this! I have an engine to tear down this week and i've been breaking bolts like it's going out of style. Mostly Yamaha. WTF do they do to their hardware?