Re: Allis B still stuck, what now?

Posted by RAB on August 15, 2003 at 12:43:59 from (195.93.34.7):

In Reply to: Allis B still stuck, what now? posted by David on August 15, 2003 at 05:33:16:

Any history? Been stuck for 20 years? or twenty days?
First of all soak and scrape carefully around top of piston as other posts have said.
Don't know about the engine but if big end shells, remove, and this may give you enough space (2mm?) to be able to crack the rust seal on each piston separately. If the rods have spun-in bearings, remove the crank before ruining these by pounding on the pistons with a big hammer.
Once cracked it's just a matter of driving them carefully up and down until they can be removed. You will probably know from the history if some will come out easily. The ones on compression and induction may be OK, but the ones on exhaust will likely be stuck harder. Remove the easy ones first and you may be able to replace the big end to help turn the worst one to the top, once the seal is cracked. Just try not to damage the pistons and especially the crank and get the cylinders, above the pistons, cleaned up and rust free. Use care if prying on the starter ring - I bought a tractor with a seized engine and a broken starter ring! Just be sensible and use a large screwdriver or similar, which will bend, and not a huge tyre lever, which will not!
As pistons are at tdc and bdc, your initial attempts before resorting to heavy hammer will need the crank to be at least under torque, as there is little point in trying to free pistons in this position without.
Regards, and hope this helps, RAB

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