If it went in, it'll come out. You just need to hit it harder and if scrapping it is a serious consideration, then damaging it doesn't matter.

I was waiting for the first start up, to see if you sent a spark plug into orbit. ;>)

Bottom of the conrod not really very suitable or accessible for BFH application, and it and the crankshaft blocks access to the underside of the piston for anything wide enough to not pose a risk of punching through it.

I made a collar to protect the crank pin from further flailing about (split ring of PVC pipe.)

Then I put the bottom of the bearing carrier back on.

I made an excessively robust protector for the bottom of the bearing carrier, (PVC pipe, with an aluminium pipe inside it, filled with chopsticks hammered in tight)

I made some sleaves for the sides of the big end, from longitudinally split pipe, in case it hung up on the bottom of the cylinder and or scratched it on the way up.

I got my smallest bottle jack and pushed on the underside of the big end.

NOTHING

Pushed harder, lifting up the block (engine mounting is off at the front)

The block ended up maybe a foot higher. This was a bit stupid since gravity is a constant, but the tension from the other engine mountings probably er mounted quite a bit

NOTHING.

So PLAN B, anticipated above, so I'm not mad, I tell you, (or I'm not alone, anyway)

Aluminium BBQ dish formed to the protruding piston top, full of pre lit charcoal, and blown to red heat with a blowpipe. Much horrible abrasive ash blowing around.

For maybe a couple of hours. Quite toasty.

This would perhaps attract comment from passers by in The Yook (or from people who's expensive cars were parked alongside) but all DIY car work is equally weird and alien to Taiwanese.

NOTHING

OK, mosquito happy hour approaches. Time to pack it in, but still quite a lot of hot charcoal.

Quench with water

BANG!

Whole piston and quite a lot of the conrod pops up through the block.

I think it was probably held in place by thermal expansion and it was differential cooling that shifted it.

No obvious damage to bore or piston, though of course there might be distortion, or damage caused by jacking up the block so high (and then dropping it) that I don't know about yet

.

Edited by edlithgow on 01/06/2023 at 01:04

It's great to have this feedback so that anyone that comes on the forum looking to free a piston jammed in place by using a plastic cup as a ring compressor knows that the solution is to have a barbecue in the cylinder bore.

Edited by Adampr on 01/06/2023 at 20:45

It's great to have this feedback so that anyone that comes on the forum looking to free a piston jammed in place by using a plastic cup as a ring compressor knows that the solution is to have a barbecue in the cylinder bore.

OK, sure

But I wonder if this could work for a seized engine, not quite such a minority interest.,

Tends to be associated with motorcycles, which are a bit more manageable size and access wise.

In that case you might actually have to apply the heat IN the cylinder bore (here it was on top of the block) and a propane torch might be a better choice, as it probably would have been here.

I'm not trying to be unpleasant, just expressing amusement at the scrapes you get into.

Trying to imagine how you've used plastic cups to make a ring compresser but I can't!

looks easy enough though I would be worried the rings having sharp edges may scrape a layer of plastic from the inside of the cup and taken up the slack between rings and bore so there is no play, maybe thats why the heat fixed it melting the plastic holding the piston??

getting closer to having it back in use from the look of it...

Edith Gow, not sure if you're married, but hopefully your husband doesn't mind you spending all this time on this jalopy lol.

This thread is marvellous. Well done fixing it Ed

Hear hear. Pics better than M words.