From this thread I get the impression that mounting and unmounting the engine repeatedly is a bad thing...

I built a PT40 from great planes from a Kit. Duing the build process I mounted an OS46LA engine on the nylon engine mounts. To complete the build, I must have installed, and then uninstalled the engine at least 10 times. Each time removing the 4 engine mount "machine screws" that tap themselves into pre-drilled holes.

Should I be concerned that the engine could work itself loose?

I do check things likle that every couple of times I go to the field, but I have not noticed any problems with the engine mount (although I did find that the rear cover of the crank case had come loose at one point (made the mounting frame of the remote needle rattle around).

Thanks for any input in advance.

gus