Don't know what engine that was that you saw but if you cut the number of cylinders and pistons by half that would be a TS3. They had 3 cylinders and 6 pistons which were horizontally opposed, the con rods were connected to the crank shaft by means of rocker arms. I did post a picture of one some time back with the side covers off and it gives you good view of all the bits and pieces.
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