Broken Bolt on the Boat

Joined
Jun 9, 2003
Messages
773
Location
Mesa, Arizona
Broke a bolt taking off an exhaust manifold on my boat. Any ideas? I tried a vice grip, but I couldn't get a good grip on it.

I had hoped this would work. I think maybe the bolt broke because it had some lateral force on it.

I have thought about getting a nut with a hole slightly larger than the shaft and welding to it. But I don't personally have a welder. Will have to convince a friend to do that.

Any ideas?

Thanks

Jared
broken bolt.JPG
 
Joined
Feb 19, 2002
Messages
1,430
If it were me I think I would grind and/or file it flat, center punch and drill it out gradually, working up in bit size. You can try EasyOuts but don't over torque or they can break off and make the problem bigger. Sometimes the bolt will free up and unscrew. Sometimes you have to go as big as possible without dinging the threads, then use a tap.
 
Joined
Apr 5, 2007
Messages
380
Location
COLORADO
I have used the old weld a nut trick, lots of times with lots of success. The nut gives you a perfect way to grab ahold, but also the heat alone will really help loosen the broken stud.
 
Joined
Jun 9, 2003
Messages
773
Location
Mesa, Arizona
Thanks for the help guys. I think I will PB blast it for a couple of days and then try some heat.

When you apply heat, you apply it to the manifold, and not the bolt --- right? Or does it matter?

Jared
 

D'Animal

Rescuer of Beagles & Landcruisers
Moderator
Joined
Mar 31, 2006
Messages
21,243
Location
Central California
If it were me.

I would weld a nut to the shaft, apply BP Blaster for a few days. Then heat the mainfold up and unscrew it.

Or drop it off at an exhaust shop. Have them do it.
 
Joined
Feb 19, 2002
Messages
1,430
Thanks for the help guys. I think I will PB blast it for a couple of days and then try some heat.

When you apply heat, you apply it to the manifold, and not the bolt --- right? Or does it matter?

Jared

Correct. Heat the manifold to make it expand away from the bolt and hopefully "break loose".
 

Users who are viewing this thread

Top Bottom