Rust coming out of Exhaust, PW 27

Author Message   cbuzzyb New member Username: cbuzzyb Post Number: 1 Registered: 08-2011 Posted on Saturday, August 27, 2011 - 11:33 pm:        I Have a Palmer PW 27 that is raw water cooled in salt water. I recently replaced the top half of the engine (cylinder and head) with a unit that was used in a fresh water lake. The original engine's cylinder and two heads corroded away in a 25 year period. I also installed a fresh water reservoir to flush the engine after use. Recently I ran the engine after about a month and rust came out of the exhaust for about a minute. I am thinking I should not do the freshwater flush and just keep saltwater in the engine. Any suggestions?   laurie_d Senior Member Username: laurie_d Post Number: 109 Registered: 10-2009 Posted on Sunday, August 28, 2011 - 06:52 pm:        cbuzzyb, Not sure if you have been following the discussion in the last few days about closed systems for Blaxlands but one very good suggestion shown in that is to run some engine coolant in your motor when you flush it. I'd also consider leaving that coolant in the motor rather than letting it run dry with the flushing. To be environmnetally responsible you should flush it again with fresh water before running it in the Lake or wherever taking care to retain as much of the coolant as you can. Regards   richardday Senior Member Username: richardday Post Number: 987 Registered: 11-2003 Posted on Monday, August 29, 2011 - 02:22 pm:        Leaving salt water in a cast iron water jacket is simply slowly destroying the engine. Flush it well after every salt water exposure and don't let any of the cast iron water jacket dry out as the salt in the iron will expand and destroy the castings. For the winter fill the water jacket with auto antifreeze and drain it off in the spring. Smart thing to do is make up a simple keel cooler and run 50% antifreeze and fresh water in the water jackets portions of the engine. Then you don't have to drain the coolant in the winter.

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