Hello fellow Afourians, looking to you for corroboration or further advice on some advice from a marine mechanic who has since retired. After installing a new double acting thermostat and still having the motor overheat, I’m thinking that the cooling system needs to be flushed. What do you think of this method:
After removing the thermostat (for the fourth time) and putting the housing back on, I plan on running muriatic acid through the anti freeze cooling system by using an external pump hooked up to the exit hose from the Oberdorfer fresh water pump up through the diverter valve on the side of the manifold, through the thermostat housing, to the exhaust manifold and out the exit port on the exhaust manifold which will flow back into the diluted acid bucket where it can be picked up again by the external pump and recirculated. I will close off the crossover valve (which I left on when installing the new thermostat) to make sure the acid will go back through the diverter valve on the side of the manifold. After a few cycles I'll run fresh water through from the dock hose to clean out the remaining guck. This way I won't be starting the motor at all. How does that sound to you all. Any advice will be greatly appreciated! Thanks Kirk
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After removing the thermostat (for the fourth time) and putting the housing back on, I plan on running muriatic acid through the anti freeze cooling system by using an external pump hooked up to the exit hose from the Oberdorfer fresh water pump up through the diverter valve on the side of the manifold, through the thermostat housing, to the exhaust manifold and out the exit port on the exhaust manifold which will flow back into the diluted acid bucket where it can be picked up again by the external pump and recirculated. I will close off the crossover valve (which I left on when installing the new thermostat) to make sure the acid will go back through the diverter valve on the side of the manifold. After a few cycles I'll run fresh water through from the dock hose to clean out the remaining guck. This way I won't be starting the motor at all. How does that sound to you all. Any advice will be greatly appreciated! Thanks Kirk
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