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Old 09-12-2021, 02:00   #1
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Join Date: Dec 2021
Location: St. Aug. Fl.
Boat: 33 Morgan 1976
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High Temp. alarm/ engine.

Does anyone know the simplest way to rig an alarm of kind to my engine temp.
gauge?
Currently have a 33 Morgan/ 1976 with the old 50 hp Perkins and an analog $20.00 temp. gauge.
I located the sending unit and am ok with basic electronics.
I self-hand the boat and get busy around the boat with the auto pilot on and had a hose problem last year that dam near cost me the engine.
Thanks,
Atlanticbrew
St. Aug. Fl.
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Old 09-12-2021, 02:10   #2
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Re: High Temp. alarm/ engine.

https://www.parts4engines.com/perkin...erature-alarm/
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Old 09-12-2021, 03:00   #3
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Re: High Temp. alarm/ engine.

Fantastic!!!
Thanks much.

Do I purchase the sending unit with the 2 posts so I can keep the gauge and this alarm going?
Atlanticbrew
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Old 09-12-2021, 07:36   #4
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Re: High Temp. alarm/ engine.

The 2 post sensor says it is for an engine with an isolated ground, it does not have two functions. You will probably have to put the sensors on a plumbing Tee, or look to see if there is another port on the engine to put a second sensor in.

Here's a thread with some more ideas. #17 has a gauge with builtin adjustable switch that closes at the temperature you select which you connect to a horn.

https://downeastboatforum.com/thread...e-alarm.21026/

And another Cruisersforum thread -
https://downeastboatforum.com/thread...e-alarm.21026/
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Old 09-12-2021, 08:49   #5
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Re: High Temp. alarm/ engine.

Thanks again. Getting this old Morgan ready for a thousand mile run.
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Old 10-12-2021, 19:35   #6
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Re: High Temp. alarm/ engine.

Try aqua alarm, connects to exhaust line, down line from header and elbows. try Defender in CT. make sure you purchase the alarm one with enough wire to take it topside.
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Old 10-12-2021, 23:40   #7
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Re: High Temp. alarm/ engine.

Here is a different idea. A modern digital panel. Feed in your analog temp signal and set your alarm temperature. Connect a horn.
It also takes oil pressure, oil temperature, rpm, shows voltage, engine hours.
For about $50 US. I replaced my Perkins 4236 panel with this unit.
There is even a version that has a RS232 output for remote connection.


https://www.aliexpress.com/item/1005...11923303%22%7D
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Old 11-12-2021, 02:33   #8
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Re: High Temp. alarm/ engine.

https://engineguard.com.au/?gclid=Cj...xoCfpAQAvD_BwE
The above is a link to an Auto guard temperature alarm.
I recently brought myself a hand held laser thermometer for under $100 Australian. It makes it easy to follow through on the surface of cooling circuits, heat exchangers, exhaust hot spots and so on.
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Old 11-12-2021, 07:34   #9
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Re: High Temp. alarm/ engine.

Great stuff from all.
Kind of like this one for simplicity's sake.
Engine guard.
Don,t know which one of the 3, I would get.

The EG01- 2 has 2 temp. leads that could be so easily hooked up. 1 strapped to the oil filter with a stainless hose clamp. and one bolted to the elbow of the heat exchange. Mount the unit down in the galley.
Mount the buzzer any where. Maybe 2 buzzers, 1 up top and 1 down below.
Going to research wether you get 2 diff. temp. readouts from the 2 diff. leads.
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Old 11-12-2021, 07:44   #10
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Re: High Temp. alarm/ engine.

Again,
I also appreciate the whole Digital panel connected to a horn.
It's reasonable enough. The unit could be mounted down below, my binnacle is narrow on this old Morgan 33.
I wonder if I could spice into the leads coming off all my original gauges, leave them in place and mount this unit down in the galley near my elec. panel and rig some horns/ buzzers wherever???
Not an Einstein with the electrical portion of boat works.
Great with a bottle opener.
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