Originally Posted by hellosailor
Bottom line is that if your engine doesn't fire up right away, you want to shut down the raw water intake and then scurry back and open it again immediately after starting.
hello's bottom line should be "hello's law"...if your raw water cooled engine is slow to start then shut the raw water intake until it does start and then open the intake.
Don't mess around with this. Water in a cylinder of a cranking or running engine can instantly ruin the engine beyond economical repair.