Reply To: Can this cylinder be repaired

[George Emmanuel]

I’ll echo Joecb’s comment and this is how I solved it. I don’t remember the brand but it was a cotter pin/wrist pin type and the existing pins were not tight. The motor had never been apart, so I know the factory installed the pins. The correct size cotter pin would fit the hole in the piston boss and also in the wrist pin, but once assembled, it wouldn’t go through, so they used a slightly smaller pin and that’s where the movement came from. There was an ever so slight misalignment between the holes in the pin and boss. First I aligned the boss hole you could see with the hole on the wrist pin and then used the correct size aircraft drill so I could reach all the way through. There was only a slight misalignment and the drill took care of it. The new, correct sized cotter pins went in and were tight!

George