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

February 16, 2011

Is there an acid or caustic I can use to disolve 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
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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 at least a week or two of daily application. Good luck.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

February 18, 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 21, 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

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