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What chemical will free aluminum pistons stuck in cast iron block?


Is there an acid or caustic I can use to dissolve the oxide so I can remove pistons?
THIS STANDARD 10 ENGLISH ENGINE HAS BEEN FROZEN FOR 35 YEARS

The Cam is also frozen

Bud Elder
Car Restorer, Hobbyist - Stuart Florida USA
February 16, 2011



Hi, Bud. Are you trying to salvage the pistons or the block? What about the rings -- they didn't prevent the piston from touching the block? I wouldn't try anything else until you've given WD-40 [on eBay or Amazon] at least a week or two of daily application. Good luck.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
February 16, 2011



Penetrating oil or WD-40, soak for days or weeks then remove the crank and drive them out from the top with a block of wood and a big hammer. You won't hurt the block, but if I remember correctly the cam in that engine runs directly in the block w/o bearings, so it might be junk anyway.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg, South Carolina
February 18, 2011


A spray product by the name of "blaster" works far better than WD-40 in most cases. I get it at only 1 chain of auto parts stores. If I remember correctly, it is hard on aluminum.

James Watts
- Navarre, Florida
February 21, 2011




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