Starter motor spinning

[Kilifi]

IN a boat!?

is the engine spinning or the starter just spinning but no engaging?

if its the starter just spinning and not engaging, check for the starter actually making contact with the flywheel...maybe wrong starter/flywheel.
alternatively, new starter!

I think the motor is Is engaging as if I crank the engine a little by hand it turns slightly by starter afterwards but is a very crunchy then just spins. I was told that all the starter motors are the same for the 1.9, so is the information I've been given wrong. I will look to see if it dos engage properly.