Shift interrupt adjustment

[Fishermark]

Early 70's Sea Ray with Mercruiser 165 (straight six) with aftermarket SE106 outdrive.

Boat has been hard to shift out of gear. Exciting when approaching the dock! Idles around 700 when warmed up in gear. That's a little high - but I can't imagine that it's so high that it should be so hard to get out of gear.

I want to check the timing of the shift interrupt switch. I have the Service Manual #1, but I cannot find any information about checking or adjusting the shift interrupt switch.

I also have Service Manual #6 which covers the Alpha. In section 1C-44, it shows how to check and adjust the switch. Specifically checking to see if it engages at 1/8" of travel:

This old Sea Ray has the NLA switch assembly on the transom:

My question is: does anyone know if the same specifications apply to the two different style of switches? If not, does anyone have the correct specs? Or even where to look in the appropriate manual?

 

[Bt Doctur]

Re: Shift interrupt adjustment

push down on the arm to see if it stalls the motor ,if not find out why.
bad switch, broken wire(s), not connected to neg side of coil.The tool shown is also the tool to bend the switch arm for it to respond with the 1/8 inck movement

 

[Fishermark]

Re: Shift interrupt adjustment

I haven't had the chance to do any real troubleshooting yet. BUT - it's actually my dad's boat that I have worked on for him in the past. When it first starting doing it, I checked the switch for him. It does in fact kill the engine when the plunger is engaged.

But it seems to require a lot of movement before working. That's why I decided to check on the specs.

 

[Fishermark]

Re: Shift interrupt adjustment

Just for the archive - in case anyone else has a similar issue.... It did in fact turn out to be a simple case of adjusting / bending the arm to get it to activate sooner. Works great again.