Another dies going into gear

[RaceCarRich]

2000 Mercruiser 3.0L
Dies on the trailer when shifted into forward.

Had problems going into gear beginning of last year. I shimmed up the interrupt switch to get through most of the season. Near end of season, I replaced the lower shift cable following instructions to the tee. All was perfect for the few times I went out before winter.

Fast forward to now, dewinterize and all is good for about 30 minutes. Change oil, etc. Go to restart, and it's starving for fuel. Long story, entire fuel system needed flushing. Just finished rebuilding carb. Starts & idles great. Dial it in. Revs great in neutral. Shift into reverse no problem. Shift into forward and interrupt switch engages. If I unplug the interrupt switch, it shifts into forward and doesn't die.

Any ideas? Adjustments (hopefully)? Can worn upper cable cause this? I'm actually looking to get rid of this boat cheap and upgrade but need to fix first.

Thanks!

 

[Scott Danforth]

replace your shift cable

 

[RaceCarRich]

Upper?

 

[alldodge]

No the upper shift cable won't help, and since you already replaced the lower, and this is happening on the trailer, I would look at the shift plate. The interrupter should not be in the issue with it sitting on the trailer. Take the thing off and make sure its not hanging.

 

[RaceCarRich]

I'm actually watching the Y move and engage the plunger so it's not a switch hanging. The interrupter is not binding. I will lube all contact points.

 

[alldodge]

I'm actually watching the Y move and engage the plunger so it's not a switch hanging. The interrupter is not binding. I will lube all contact points.

Check the switch to see if the internal contacts are remaining closed after it should be opening up.

 

[Bt Doctur]

The switch should never be moving when on a trailer, if it is ,the lower cable is bad or mis-routed or the shift cables are mis-adjusted

 

[RaceCarRich]

Thanks. I think I figured it out. When I replaced the lower, I forgot that I intentionally misadjusted a little to compensate for the upper cable being out of spec. Upper only moved 2-11/16" (per today's measurement) so I had to rig the adjustment. Not sure why it worked fine last season. In any case, my new upper cable will be in tomorrow. Not sure why I completely forgot about that until I checked it today. Sorry for any confusion and thanks for making me think clearly about how it all works. When you've only touched a mechanism 2-3 times in your life, things don't register as automatically.