Re: Evinrude 50173s transmission selector switch
This sounds like a hydraulic problem to me. That said, there really shouldn't be any difference in shifting when the motor is in a barrel, as opposed to being tied to a dock.
The clicking that you heard when going into reverse at the dock, is probably from the clutch dog not seating completely in the reverse gear. What you are hearing is the "ears" on the dog, making light contact with the corresponding surface on the gear.
Your gearbox shifts by application of hydraulic pressure against a piston that moves one step aft to select neutral and an additional step aft to select reverse. There is a pump and a pair of poppet valves to create the hydraulic pressure and direct it as needed. The poppet valves are controled by the elecrical solenoids - which is why the system is called "hydroelectric." If the hydraulic pressure is insufficient or the piston is binding, you won't get the movement needed to place the cltuch dog in the proper position.
I would take F R's advice and see if the motor will shift properly with a little added throttle. Another thing that you might do is to flush the gearcase with automatic transmission fluid or kerosene a couple of times. Sometimes there is a bit of dirt built up, which can be flushed out in this manner. Run the motor a little during the flush applications and eventually replace with BRP Premium Blend (the current Type C equivalent) gear oil.
On the voltage test for the solenoids, make sure you are getting 1.5 to 2.0 amps for 10 minutes. If you are not, you probably have solenoid problems.
You may also have shift solenoids that are not properly adjusted. If so, make sure you have a proper manual for reference, before trying to adjust them.
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