Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Clearances are all with these. Your displacer may be too small for its bore or the displacer gland may be leaking. The gasket that isolates the displacer may be leaking, and there are probably other places you can check.

As for timing, you should be able to set the crank throws 90 degrees apart (either way; this just affects the direction of rotation).

And now, having dispensed all this sage advice, I must admit that I have never gotten my Moriya fan to run properly.🤔