Yesterday I made this brass adaptor to screw into the spark plug hole on a 1950's Power Products engine with a stuck piston. This is a 2 stroke engine, but the piston is stuck above the intake and exhaust ports, so I filled the cylinder with oil, then used my grease gun to pump in a lot of grease and pressure. The pressure pushed the oil past the piston and rings, but didn't move the piston. If I had a powered grease gun it would probably pump the grease in much faster than I can do by hand, and it might have unstuck it.
I used a piece of 9/16" brass hex, then drilled a #3 hole for the grease fitting, which is 1/4 x 28 thread. I had to buy a 14mm x 1.25 die on ebay for the spark plug thread. I turned the brass to a snug fit of the ID of the die as a guide, to be sure the thread started straight.
Stuck Piston Greaser.JPG
I used a piece of 9/16" brass hex, then drilled a #3 hole for the grease fitting, which is 1/4 x 28 thread. I had to buy a 14mm x 1.25 die on ebay for the spark plug thread. I turned the brass to a snug fit of the ID of the die as a guide, to be sure the thread started straight.
Stuck Piston Greaser.JPG
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