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Coast Rider's picture
Coast Rider
Last seen: 5 months 3 weeks ago
Joined: 10/17/14
Posts: 40
new thermostat operating range 10 degrees too high

 My new thermostat is operating between 185 and 200 degrees. My m25 Universal engine manual says 175 to 190 is the correct temp range. Should I shop around for a new thermostat or am I OK ?

Joe Lucido
1986 Catalina 36
Hull # 0625
M-25 Universal diesel
Oceanside, CA

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Joe Lucido
1986 Catalina 36
Hull # 0625
M-25 Universal diesel
Oceanside, CA
caprice 1050
Last seen: 1 week 9 hours ago
Joined: 7/1/07
Posts: 345

Joe

I mentioned this before, but I don't know the heat conditions in California. In the gulf of Mexico off Florida the summer Gulf temperature is as hot as 20 degrees hotter than the winter water temperature causing our engine to run about ten degrees or so hotter.

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__/)__/)__/)__Capt Mike__/)__/)__/)__
Punta Gorda Florida
1990 Std WK M35 Hull #1050

clennox's picture
clennox
Last seen: 4 weeks 1 day ago
Joined: 3/31/14
Posts: 202

My two cents: Step one make sure your gage is correct. I always double check with a known good gage.
​I spent a ton of time and money once thinking I had a heat problem, when it was the gage 10 degrees high.

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Chuck Lennox
97 MKii Ventura Ca
Island Girl Hull #1611

Coast Rider's picture
Coast Rider
Last seen: 5 months 3 weeks ago
Joined: 10/17/14
Posts: 40

Hi Chuck,
correct. I checked with a laser temp gun. Thermostat housing was 15 degrees cooler.

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Joe Lucido
1986 Catalina 36
Hull # 0625
M-25 Universal diesel
Oceanside, CA
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