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Starboard Engine Overheating
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Topic author - Scurvy Dog
- Posts: 2
- Joined: May 12th, 2016, 12:47 pm
- Vessel Info: 1988 Carver 3807 Twin 454s
Located in Gangplank Marina, DC - Location: Washington, DC
- Been thanked: 3 times
Starboard Engine Overheating
Twin 454s
Gangplank Marina
- SplashyLady
- Captain
- Posts: 267
- Joined: January 5th, 2016, 10:02 am
- Vessel Info: Carver 3227 Sedan Convertible
1986 - 260 Mercruisers - Kohler 5E - Location: Lake Norman, NC
- Has thanked: 20 times
- Been thanked: 87 times
Re: Starboard Engine Overheating
It's not unusual to find gunk clogging the heat exchanger and that will limit flow for the cooling water and cause temps to rise with higher RPM. Sometimes the rubber gaskets on the heat exchanger also deform and can block cooling water flow. Thermostats don't fail very often, but when they do, they usually stick - so you will get cool temps sometimes and hotter temps at other times.
Hope this helps - good luck!
Past Commodore, Peninsula Yacht Club
Lake Norman, NC
Carver 3227 - "Splashy Lady"
Aquasport 222CCP - "Gone Fission"
- bud37
- Admiral
- Posts: 4676
- Joined: April 23rd, 2015, 10:22 pm
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Re: Starboard Engine Overheating
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- CYO Supporter
- Posts: 5799
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807 Aft Cabin
- Location: Ontario, Canada
- Has thanked: 431 times
- Been thanked: 1586 times
Re: Starboard Engine Overheating
I would first physically confirm that there is indeed and actual overheat, don't assume that the gauge or sender are working properly. After you confirm there is indeed a cooling issue, my next thought would be when the last time the impellers were changed. If you don't know that, it's time to change them. While most folks get years of service out of them, chances of failures due to fatigue and wear and tear increase after the second year hence Merc's recommendation to replace every two years to minimize the chance of failure at the worst possible time.
All the above suggestions are good ones and possible causes. If it's a Crusader, the U oil coolers are known for causing this if not kept clear.
If it's an impeller failure and you find that parts of the impeller are missing, you must back-flush the system to get rid of the pieces that will be blocking cooling passages. Typically the oil coolers and heat exchangers will trap them and if not removed will continue to haunt you. When you back-flush and recover the missing pieces, put them back together on the related impeller like a puzzle, this will indicate whether you've gotten them all or not.
If closed cooling, what condition is the coolant in, and is it topped up where it should be? Several other things to consider but all the above are a good start.
Keep us posted.
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