Engine cutoff switch not working when shifting into reverse

[jtickla]

I have replaced both the upper and lower shift cables on my mercruiser motor and am still having problems with the throttle plate not activating the engine cutoff switch when shifting into reverse. The motor shifts into reverse, but makes a grinding noise before fully engaging the gears and going into reverse. I am under the impression that the cutoff switch should temporarily kill the engine so it can shift smoothly into reverse without grinding the gears. I have been thru the cable adjustment procedure multiple times and feel like I have the cables adjusted where they need to be, but the throttle plate is not moving and activating the kill switch. Any idea what could be going on? Could the gears just be so loose that I am able to shift into reverse without temporarily stalling the motor? Is that a bigger issue? My concern is that I am going to damage the gears by grinding them every time I go in reverse. Help?

 

[Bt Doctur]

Nope, your wrong. Mercruisers shift with that noise and need to be shifted "briskly" into gear. The shift interupter ONLY should work coming OUT of gear.

 

[jtickla]

got it. Thanks for the help and quick response.

 

[bondo]

I am under the impression that the cutoff switch should temporarily kill the engine so it can shift smoothly into

Ayuh,.... That switch is only activated when shiftin' Outa gear, In the water,.....

Alpha drives need to be shifted Briskly, into gear,....

 

[RicardoMarine]

Nope, you're wrong. Mercruisers shift with that noise and need to be shifted "briskly" into gear. The shift interupter ONLY should work coming OUT of gear.

Yep..... this system should be called a NSA or NSI (Neutral Shift Assist or Neutral Shift Interrupt)

And by the way....... the Merc Dog Clutch drives require this, not the B series drives.