Adding over temperature alarm to engine coolant guage.

jssailem

jssailem

SBO Weather and Forecasting Forum Jim & John
Oct 22, 2014
22,825
CAL 35 Cruiser #21 moored EVERETT WA
Do you have a second spot on your engine block to attach a Temp Sensor? On my Perkins I have 2 threaded spots to use a thermostat or Temp Sensor. One is set in the block near the pump which provides water temp for the gauge. The second is near the other end of the block, I put in a temp sensor that is set for 200º. This is triggers the ALARM.
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They come in various sizes.
 
Ralph Johnstone

Ralph Johnstone

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Jan 4, 2006
7,181
Hunter 310 West Vancouver, B.C.
Do you have a hot water heater which uses engine water for the heating medium ?

If so, plug in a brass "T" and screw in a temperature Xmitter. You'll have to make a ground for the Xmitter.

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Alan Gomes

Alan Gomes

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Nov 22, 2011
1,250
Ericson 26-2 San Pedro, CA
Hayden Watson said:
My M-25XP has a coolant temperature gauge but no audible alarm. This is fine if you constantly watch the temp gauge but that is not a reality. CD sells a replacement thermostat housing that has a second port for an alarm but is costs $260. Are there any other ways to get an alarm a bit less expensive?
High Temp Alarm Retrofit M-18, M-25, M-25XP,M-35 (catalinadirect.com)
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www.cruzpro.com. It is a digital temp gauge with a settable alarm. You could replace your existing gauge with one of these. ,
 
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Ralph Johnstone

Ralph Johnstone

.
Jan 4, 2006
7,181
Hunter 310 West Vancouver, B.C.
dmax said:
measures the exhaust hose temperature:
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Ooops, only for the loss of cooling water flow. No cooling water flow, the exhaust temp. instantly goes through the ceiling.

Granted, no cooling water flow will eventually overheat the engine. However, in the case of plenty of cooling water flow and a scaled up heat Xchanger, no change to exhaust temp. but the engine cooks.
 
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dmax

dmax

.
Jul 29, 2018
1,162
Telstar 28 Buzzards Bay
Ralph Johnstone said:
Ooops, only for the loss of cooling water flow. No cooling water flow, the exhaust temp. instantly goes through the ceiling.

Granted, no cooling water flow will eventually overheat the engine. However, in the case of plenty of cooling water flow and a scaled up heat Xchanger, no change to exhaust temp. but the engine cooks.
Click to expand
Works for me, I have a clean HX plus I glance at the temp gauge often. I mostly want to know if the raw water intake gets clogged or the pump fails.
 
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RoyS

RoyS

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Jun 3, 2012
1,742
Hunter 33 Steamboat Wharf, Hull, MA
My engine came with an over-temperature alarm connected to the high frequency buzzer in the engine control panel. My 74 year old ears no longer hear that alarm frequency with the engine running. I put a small marine boat horn near the helm electrically in parallel with the engine temperature sender. That alarm will wake the dead and even I can hear that one.
 
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Ward H

Ward H

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Nov 7, 2011
3,775
Catalina 30 Mk II Cedar Creek, Bayville NJ
My M25 XP had the second port with a plug in it. I bought the sensor and
2 tone alarm from CD. Worked great.
 
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