im going to add another question,

Is there a part of the piston firing cycle where to of the pistons are at the same level???


Counting from front

5 6

3 4

1 2

Radiator

Pistons 3 and 5 are level, about midway in the cylinder.
Piston 1 is at the top of the cylinder. Normal???
Or do I have a broke connecting rod or something like that?