I have a maxum 2400 scr with a mercruiser 5.0/ alpha 1 . I have spent some time getting familiar with the engine, to try to learn where everything is. I have learned a lot. But one thing I havent been able to find yet is the sea water strainer. I havent spotted it in the engine compartment. Could it be that the water filter (screen) is in the stern drive water intake? and is it maintenance free. Thanks