Re: 84 Mercruiser 470 raw water
First boat, free, 470 uh oh
. Just kidding! There are a couple of things you should check on your 470. They have a few special "issues" that are not common in other Mercruiser engines. First with the engine running check the lower starboard side of the coolant circulating pump on the front of the engine. look for the small weep hole to see if coolant is coming out there. read
http://www.sterndrives.com/470information/470coolantleakrepair.htm If it is leaking it will need new cam seals, if not, Don't worry about it, just check now and then. Make sure your coolant level in the reservoir is full to the top, and keep an eye on the level. If your charging system is working that is great, if it stops working, get an alternator conversion kit, rather than trying to repair it. These motors are prone to head gasket problems, so when you get a chance you should do a compression test, paying special attention to cyls 3 & 4 if they are low you may need a head gasket. A cooling system pressure test is also a good idea. Autozone will let you borrow tools for both tests for free. Last thing keep an eye on the engine temperature, don't let it overheat. Come on back with any questions. I like my 470, but they keep you on your toes
. Have fun.