Mercury 4S 5HP Shift Interlock problem - Can't Pull-Start

May 25, 2019
29
Catalina 30 Bronx, NY
Casting a wider net here, as well as adding photos.

2 weeks ago made a mistake and tried to start the motor without having the external fuel tank air valve open. The result: it did not start. But I yanked on the starter so hard, and so many times that I knocked the pawl that locks the pull cord (when not in neutral) out of its position and the starter pull cord became locked, i couldn't manually release it.

This past weekend I took the motor off the sailboat and mounted it on the dock and removed the pull start assembly and moved the pawl into place, and was able to pull clearly.
Once I put the motor back on the boat, I was able to get a clean start right away, which is great. At the end of the sail, I had to finesse the shifter into a delicate middle point in order to free the pull cord, and once started, the shifter would not go back into neutral. This is obviously not a sustainable or safe way to operate.

Does anyone have any suggestions as to what I am not getting, maybe a small plastic part missing? I just cant visualize the mechanics of how the shifter is supposed to "fall into" neutral. BTW, this motor was fully serviced, lubed and tested at the dealership, and I picked it up less than a week before this incident. I am sorry if I am not using the right technical terms here, I am not a mechanical person by nature.

See annotated photos. Another forum reply suggested that the problem is with the shift rods in the lower casing, a result of something done by the shop when checking the impeller. I have no desire to go poking around there, I hope someone here has a solution for me.
 

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Nov 6, 2006
10,104
Hunter 34 Mandeville Louisiana
Really tough to see without putting fingers on, but it sounds like an adjustable bracket in the shift mechanism, proably the one that has to be removed in order to check/change the impeller. In the drawing that you'd attached to the other note, Whatever item 15 in that drawing attaches to is where I'd start looking. I am not at all familiar with that motor, but there should be some adjustments, either to the linkage push points or to the bracketry that supports the levers (items 17 and 22) so that the lock disengages in neutral. I would take it back to the shop and ask them to adjust the linkage so it works.. Most shops work primarily on big outboards so their expertise level with small engines is usually sub-par.. Good luck with them..
 
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