Thank-You Greg. I recently bought a 12' montgomery ward aluminum boat Sea King and that is where the 7.5 hp motor came from. I think it was a complete package that was bought new by a couple owners back. The Johnson 5.5 hp was bought back in July, and that is what I bought first. What all would i need to buy to replace the cooling impeller, are there gaskets that i would also need? What would be the best book to buy for my Johnson Model CD-11 so that i am not always asking all these questions? Once again thank-you to all of you for your friendly help.:happy: Richard