Vacuum cutout switch question

[nj-boatbuilder57]

Follow-up question: where’s the neutral switch? this engine doesn’t have any way / means to know it’s in neutral to engage this safety circuit. How does it "know"?

[RICHARD A. WHITE]

No Neutral switch on the motor, if it had one it would be in the throttle/shift control box by the drivers seat

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[adam1961]

I have never looked at one on the later motors with the double mercury switch. On the Early RD models, the vacuum switch will provide a direct path to ground anytime the contact are closed by high vacuum, and it entirely independent of the mercury single mercury switch. In those years the mercury switch was only found on e-start models.

[frankr]

Cutting the throttle (slow position) closes the mercury switch and completes the vacuum switch housing’s ground circuit. At high throttle settings, the mercury switch is open and the vacuum switch housing is not grounded, so it cannot function. In other words, the vacuum switch can only function at slow throttle settings (which you are going to do by instinct, as you suggested). It cannot function at high throttle settings, because under certain conditions, that might induce a high speed miss.

[crosbyman]

conclusion…. design intent so dont fix t if it works …

if it doesn’t work well you have to decide to fix it or not

Joining AOMCI has priviledges 🙂

[Author]

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