8/29/16 update: I installed a Doorman 54002 coolant recovery tank.
9/14/16
Today I picked up the new Sendure heat exchanger from Grant.
Saturday, August 20, 2016
Mild Engine Overheat
On the way home from the boat yard after relaunch the engine over temp alarm was growling. Reducing the RPM silenced the alarm. At the slip I observed proper raw water flow out the exhaust and good coolant flow in the heat exchanger. The heat exchanger is 18 years old and is pretty cruddy so I'm going to replace it. Grant Ball advised installing a coolant recovery container to allow the heat exchanger to run completely full of coolant. This should reduce oxidation in the heat exchanger.
8/29/16 update: I installed a Doorman 54002 coolant recovery tank.
It fit nicely on starboard side of engine bay. About 2.5 feet of 5/16 ID fuel injector hose was used to connect it to the heat exchanger overflow port. I also installed new fresh air inlet hose on starboard side and removed a failed blower.
9/14/16
Today I picked up the new Sendure heat exchanger from Grant.
8/29/16 update: I installed a Doorman 54002 coolant recovery tank.
9/14/16
Today I picked up the new Sendure heat exchanger from Grant.
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Thermostat Advice for Sendure Kit: I have the yanmar 2GM freshwater conversion(by sendure). One of the advantages to converting to fresh water is being able to run your engine at a higher operating temperature (with the proper thermostat installed) than with sea water cooling (lower temps reduce caulking, mineralization, and corrosion internally from sea water, so use a colder thermostat). The fresh water conversion allows for a higher operating temperature (optimal combustion temps/drier oil), but is only possible if you have the higher temperature thermostat with your aftermarket cooling system. It looks like you already upgraded the alarm temp to the 2gmf alarm, which I did as well, but do you have the proper temp thermostat? The 2GMF higher operating temp thermostat is a larger bore and does not fit into the 2GM thermostat housing, which is different between 2GM and 2GMF. To compensate for the different housing, there was a higher operating temperature thermostat for the sendure conversion that is no longer available since many years (manufactured by Dole I believe). After a truly exhausting search, I was able to locate a suitable thermostat for a Johnson outboard that was intended for use in fresh water (therefore has a higher operating temp and no worry about sea water mineralization). The part # is a JOHNSON EVINRUDE OMC 5031762 THERMOSTAT 72 DEGREES The only modification I made to it, was to drill a small bleeder hole in the valve if you want so it has the same bleed hole as the original thermostat. Did you get a good deal on the replacement heat exchanger? I'm likely to need to replace mine at some point. Thanks for your blog!
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