27-01-2023, 07:02 PM
When I had the misfortune to lose the head from a little ned bolt (new proper high tensile when fitted) I decided that the only way to save the piston was by mig welding a blob on the end of the broken bolt still inside the piston skirt. I managed this without damaging the piston, and took out the remains by means of a very small self-grip type wrench. With no tension on the bolt it was quite free in the thread of the conrod. Having removed the piston I washed the conrod in paraffin, I wiped it clean, inserted a new bolt and tightened it. A line of paraffin then spread down the sides of the crack on the centreline of the conrod web, so I had to find another rod.