Ok. So the engine that prompted me to start this thread is all wrapped up, I ended up replacing the bearings and piston ring, so I noticed after putting it back together that there was a strange clicking sound, this was happening when the piston was outside of the top of the stroke, so I pull the back plate off and pull the glow plug out, after a minute it was apparent that the con rod had a tiny bit of play, this just isn't right is it?
I see this being a problem, am I right to think so?
On a side note, I went through hell getting the con rod disconnected from the crank, something that is normally very easy.