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smashing out stuck piston

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sean in alberta

04-16-2007 09:33:35

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I have a 1950 M that I am in the beginning stages of restoring. I have the head off and oilpan dropped. Given that I have new sleeves and pistons for it already I'm not particularly interested in trying to save the stuck piston and therefore want to "smash" it out. Is this advised? What is the "correct" way to destroy a piston and remove it without wrecking the connecting rod or cracking the block?

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JayWalt

04-16-2007 20:39:02

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Re: smashing out stuck piston in reply to sean in alberta, 04-16-2007 09:33:35

I've never messed with a stuck piston, but I'm with JIM and tom on this one. It makes no sense to just go smashing things because they have no value when they are near things with alot of value. Just one wrong move and u could have more problems then its worth. Take the time to either soak the pistons and get them out first, then run a bead of weld up the sleeve and pullem out, or do as jim suggested. There is no way in H e l l I would risk ruining a block because of haste or carelessness.

Sure u might get lucky with a smash and burn tactic, but if you arent, then its off to a salvage yard for a block (and probly have issues with it needing reworked).

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Tom Windsor

04-16-2007 16:43:23

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Re: smashing out stuck piston in reply to sean in alberta, 04-16-2007 09:33:35

Sean

If there was an origional smasher, it is me. I tried what you are thinking about and paid the price by damaging the bore on the cylinder. PLEASE, do a controlled removal as suggested by Jan below.

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Janicholson

04-16-2007 09:55:05

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Re: smashing out stuck piston in reply to sean in alberta, 04-16-2007 09:33:35

I do not like the idea of smashing out a piston in cast iron. If the piston is swelled up by the blows, a cast cylinder (the ouside structural bore into which the sleeve in pressed) can split, severly reducing the value of the block and making real repair more difficult.
Drilling numerous holes in the piston till the inner part of the head of the piston is removed, then using a muffler chisel (a doglegged hand tool with a slot cutting business end) to cut down one side will do the trick. This uses much less force, and applies force locally, and downward, not swelling sideways.
JimN

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Nat 2

04-16-2007 09:41:30

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Re: smashing out stuck piston in reply to sean in alberta, 04-16-2007 09:33:35

Bang it out with a BFH and an oak block from below. The whole thing should come out as an assembly.

As for how you're going to salvage the connecting rod... Good luck on that.

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HENRY E NC

04-16-2007 18:17:32

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Re: smashing out stuck piston in reply to Nat 2, 04-16-2007 09:41:30

I did it by turning the engine upside down on an engine stand, removing the crank and then taking a round piece of metal( 3/4 rebar) and ground it down to slide past the rod to the piston and used a 4# sledge to drive out the piston and sleeve. Had to cut the sleeve to separate rod. Worked slick as a whistle. No damge to block or rod.

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