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Guys, EVERY engine manufacturer recommends that you flush the engine after use in salt water. In fact, they recommend flushing it EVERY TIME after use. The reason is not only corrosion, but salt buildup in the cooling passages, which, on some engines are quite small.
I have had both kinds of engines - those equipped with a flush port (making it easy to flush in the water) and those without (making it almost impossible to flush in the water). I have also taken both kinds of engines apart. Flushing makes a difference with salt buildup.
This is not to say that your engine won't run fine for many years without periodic flushing. It's not a huge issue, just another minor thing to take care of.
It's not rust that's the problem, it's corrosion. They are different and are caused by different things.
Flushing does NOT beat on the water pump. However, take care as some engines should not be flushed in the horizontal position, only in the vertical, due to pressure forcing water up to the top and into areas where it could do some damage (old Johnsons). (These vertical flushers are the ones that are impossible to flush in the water. At least with an engine that you can flush horizontally, you can put muffs on it.) Always flush at low pressure.
Here's a tip: When flushing for the winter, after a good fresh water cleaning flush, hook up a bucket (as described above) and run gallon of antifreeze through it. It will all run out, but it will provide a coating to help prevent rust in the cooling passages while stored.
 
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