Hi all the other day while checking over my J.A.E. .21 FE i tried sqeezing a 2 oz syringe of water through the water cooling system i noticed a partial blockage after trouble shooting the system the after market aluminum water jacket for the Leopard 3674 with the 90 degree brass fittings that Offshore sells was the problem . After removing the water jacket i noticed a lot of calcium build up on the inside of the jacket and the can of the motor after cleaning both surfaces with a wire wheel and Dremel i put everything back together and had good water flow. I run my boats on fresh water lakes and at the end of the season i push several syringe full's of air through the system to flush residual water out of the system. What can i do to prevent this problem from coming back ? Regards Andris Golts.
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