Ok im a little green on these so here goes... I have taken the nail and the dyna out of the beast to rebuild it. Problem is that it has seized pistons, how can I get it apart with out being able to spin it?i disconnected rod caps and can move a couple piston partially up. Shouldn't I be able to completely pull these out through the top? Is there a lip or is it just that rusted?
First, get a ridge reamer. There will be a small ridge at the top of the cylinder at the upper limits of the piston ring travel. It must be removed. If any pistons are actually rusted to the cylinder walls, I recommend soaking the cylinder with Marvel Mystery oil. If the heads are off, just pour enough into each cylinder with a stuck piston and let it sit for a few days. After that, if the piston will not move freely, Get a block of wood that will fit into the cylinder, place it on the rod journal. if the piston moves a little, then tap on it's top (with the block of wood). Move the piston up and down in the cylinder, each time a little more. If there is visible rust on the cylinder wall, get it off with a little fine emery cloth and oil before you try to slide the piston through the rust. It may be a little tedious, but I cannot recall ever running into a piston in a rebuildable engine that I could not remove intact. This includes the 425 Nailhead that now powers my pickup truck, that had been sitting in a field for three years before I bought it.
Progress! A few hours work, some brass, wood and a few hammers result in some progress. 6 are out, 2 are for another day. The reamer was needed as well as some patience. When I got the car 1 of the heads was off and I could see the shattered piston. All 4 of these pistons are toast, due to weather and divots left by something. I could not see the varmint nest in the other side. The nest is the worst one of all! Lots of corrosion and pitting. (Still stuck). I probably need to bore this one and put a sleeve in it. I'll wait for another day for advice on rebuild parts... Thanks, Jerry
