A topic of interest to me as I have a 3GM30F with a Kanzaki
I have always sailed in neutral and actually haven't found the turning prop and shaft to be annoyingly loud for some reason. After reading that here I looked to make sure it was turning while sailing. It was and now I can hear it through the wind
and waves noise
. Maybe my boat structure attenuates it more than others.
One time (one time... at band camp
) I accidentally left the trans in gear
, but frankly I can't remember if it was forward or reverse. At any rate, when I wanted to start the engine
I noticed the error and found the shift lever took a very strong effort to disengage the gear. That concerned me but no apparent damage was done.
As far as the slipping and polishing goes I can see one way this could happen.
I had to rebuild
my shifter (related to improper lever and cable setup for A4 and a failed plunger spring) so I've seen the inside and had to study up for the repair. In my opinion, if the shifter was not adjusted properly even by a small amount it could cause a situation where slipping and polishing of the cone could occur.
It could even function well enough while being driven by the engine yet slip when in the sailing in gear.
This is because the forces on the cone and gear would be in the opposite direction from the normal operating mode when sailing in gear. In other words, the load is reversed. And therefore opposite to the direction the parts
were designed to operate.
Combine that with a improperly adjusted shifter and there could be a problem with the friction fit of the cone and gear over a period of time. A wearing down of the oil
grooves would compromise the function of the cone. And the shift plunger would be in contact and wearing at all times as well.