Chuck I use PB blast a lot as well as Kroil Also I will use "Rust Buster
Some times it takes all three but usually after soaking with each and some time usually I get things free.
If you would like I can get all three to you.
You may get them to unfreeze but the threads will probably gaul up with you break them free. LOTS of heat on the alluminum is your best bet.
Put your best foot forward!
PB blast it for a day or two. Heat the screw liberally with a torch, then put it in the freezer or put it in a bunch of crushed ice. Should do the job, might have to do it twice. Save some ice for margaritas when you're done
try some sort of acid like used to clean aluminium rims
I found some PB blaster at work and soaked the parts down pretty good tonight. I have already bought the replacement aluminum parts, so I'm not worried about scrapping them. We'll see what some elbow grease and heat does on Saturday when I get back over to the shop.
Thanks for the help, guys!
Retired! Boating full-time now.
Sux - lucky you don't need the aluminum piece.
The key to the heat & cold is to heat the aluminum without heating the bolt, then chill the bolt. The bigger the temperature spread between the two the more chance of sucess. Giant tip on oxy-acetylene torch - heat the aluminum fast - then there is just a few seconds before the bolt starts to heat.
In the day we would hit the bolt with liquid freon to chill it selectively (wear safety goggles, I'm sure we contributed to global warming/lost ozone layer , but heck - who knew ?) Today we use a big bottle of CO2 (still global warming, but at least you don't wind up in jail)
If not successful, let it sit for a few hours, spray with PB or Kroll, then do it again.
Takes a little feel to not melt the aluminum. A propane torch just isn't hot enough for the fast heating you need in extreme cases.
Good luck - and do not forget the margaritas when finished.
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