Originally Posted by
wpadams
FWIW I devised a method to work out the right orientation that is perhaps better than guesswork. I tapped out the contrapiston and oiled up the bore and piston. Holding the liner in place by hand I twirled the crankshaft, feeling for how freely the piston rode up and down in the bore. One of the 3 orientations seemed freer than the other two so I took that to be the correct orientation.
'
That's probably about as good as you can do realistically-likely to be correct...and you wouldn't pick it up with the contra in place....
ChrisM
'ffkiwi'