Re: Disassembling Merc 4 cyl. W/stuck piston

[green-thumbs]

I am a firm believer in the grease gun technique. With no worry about saving block tap the
no longer good sparkplug hole to any convenient NPT thread use a bushing of that size thread with a 1/8" NPT hole in center. This is same size as hose to grease gun. A short length of pipe threaded to 1/8" NPT and you are good to go. NPT tap. bushing and 1/8 NPT pipe are standard hardware items. !/8" NPT is a common size … To avoid bursting hose I use the 1/8" NPT pipe to make a direct connection from grease gun to adapter or in this
case bushing …the check valve in pump holds pressure.
Tap might be available as rental the bushings and threaded 1/8" NPT pipe pocket change.
Once you get a stuck piston moving you can get it to ports from there you may be able to
drive it out using a hardwood dowel thru enlarged spark plug hole.
i just finished saving pistons from a KF7 with a stuck piston and a locked up with
rust crank and rod assembly.
Louis
Sleeves are cast into in block. The only practical way to separate is a device called a "Sweat" Furnace that melts aluminum but not steel.