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Old 16-07-2015, 17:01   #1
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Join Date: Aug 2008
Location: Darwin, Australia
Boat: CT34
Posts: 30
yanmar gm30 f engine senders and switches

Hello All.

I have a Yanmar GM30F..with NO WIRING..its secondhand, delivered from the dealer without any wiring.

There are 4 senders/switches that I can see.

Top front of engine. There are no senders in the raw water but there are 2 (repeat TWO) senders in the coolant. One going into and the other comming out of the heat exchanger.

Question1. why 2 sensors? I guess that the one out of the heatexchanger (the hotter one) is the most important so I will use that

There is an oil pressure sensor down near the oil filter.

There is a switch at the back near the gearbox

Question 2: What the hell is this switch for???? it is a switch isn't it?? 2 spade terminals?

Help with these two unkowns would read with gratitude


Darwin Australia.
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Old 16-07-2015, 17:17   #2
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Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
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Re: yanmar gm30 f engine senders and switches

The sender on the back is likely the magnetic pick up /sender for the tachometer It is located on the top of the flywheel It counts the teeh as they zoom by (127 teeth on yours)
Will & Muffin
Lucy the dog

"Yes, well.. perhaps some more wine" (Julia Child)
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engine, yanmar

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