Re: Disassembly of a stuck Forty Minus SJM
Posted: Tue Oct 20, 2020 4:41 pm
The piston is too low in the bore to move it far with the grease nipple method.
The piston top edge was stuck just above the exhaust port. I figured if I tried the grease method it probably would have moved but would have stopped when the grease leaked into the exhaust port.
I bought a short section of aluminum pipe that was 1.75" in diameter with a 1/8" wall. This pipe fitted nicely over the connecting rod and yet contacted the piston skirt evenly. Used a friends 20 ton hydraulic press and was able to push the piston out the top. The piston fought every step of the way. The rings have minor corrosion at some points along the edges and will be replaced. Despite how hard the piston was to get out, the piston and cylinder walls look to be usable.