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

Some Marklin eccentrics can definitely be moved and adjusted; I have done it recently on a 4158 compound where both eccentrics are held in place by tiny set screws. It would not run because the eccentrics had moved and the timing was off. I don't have a 4150 so can't say for that model, but when your eccentric is at it highest point it should be 90 degrees apart from the crank pin. If that's not the case, it has moved.