Re: 1985 Force 50. Please help with manual release.
I think you mean that you removed the internal circlip that holds in the valve. If you run the motor, it would probably blow out the valve BUT---This is a bad idea. You will end up getting water into the pump and ruining it.
Your best course of action would be to completely remove the trim/tilt unit since there is no manual release. Two bolts hold it to the transom clamps, three bolts hold the motor and pump and one bolt holds the top of the tilt cylinder. Then, buy a length of 7/16 diameter stainless rod to use as a tilt adjusting rod. Of course, there will not be a reverse lock and if you put the engine into reverse at any speed, it will fly up out of the water.