Advice on removing snapped s/s bolts from alu block - Page 4 - SailNet Community
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post #31 of 36 Old 10-05-2012
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Re: Advice on removing snapped s/s bolts from alu block

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Use a dremel and cut a groove for a flat head screw driver, soak it in PB Blaster or the lube of your choice then back them out with a hammer drill.
+1.......worked for me on almost every screw on my boom....

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post #32 of 36 Old 10-06-2012
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Re: Advice on removing snapped s/s bolts from alu block

Heat, impact, PB Blaster.


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post #33 of 36 Old 10-06-2012
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Re: Advice on removing snapped s/s bolts from alu block

PB Blaster is great. This might be better.

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post #34 of 36 Old 10-06-2012
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Re: Advice on removing snapped s/s bolts from alu block

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PB Blaster is great. This might be better.

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oh yeah, +1!
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post #35 of 36 Old 10-08-2012
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Re: Advice on removing snapped s/s bolts from alu block

Mark, fastest cheapest best result might be to just find a good machine shop, let them deal with it. If the machinist has any doubts, find a better shop.

PBlaster is great stuff, it chemically attacks the corrosion. So does Kroil--but you have to mail order that.

Torches are nice but can weaken the metal. A CO2 extinguisher or small tank of CO2 from a gas shop can do the same thing by freeze-soaking the parts. Slotting the bolt with a Dremel and using an impact hammer is also good, I'd try the PBlaster and freeze cycling it 3-4 times before whacking away at it, in that sequence. And if none of that worked, THEN center punch it and carefully drill out as much as you can. In the worst case, you overdrill and use Heli-Coils. But a good machine shop can put that engine in a drill press and chew the studs out, or they can weld a crossbar onto them and then just spin them out.

I'm going to guess they'll get rid of the bolts for under $50, as opposed to screwing around all afternoon worrying about it. Hardest part of the job would be finding a good machine shop.
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post #36 of 36 Old 10-08-2012
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Re: Advice on removing snapped s/s bolts from alu block

I've had this exact problem. I've tried most of the solutions posted here, including an oxy-mapp torch.

The thing that worked in the end: an arc welder.

There's corrosion between the bolt and the surrounding aluminum. It's frozen in place.

The current from the welder broke it free in under a second.

Take it to a shop with a welder. Ask them to pull the bolt.

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