Re: 470 throw out or keep
Do a search on "470" and you'll find a lot of info in this forum. The 470 along with the later introduced 3.7 L in-line four tend to be very mechanically sound engines. The major problems that are encountered tend to be the electrical and cooling systems. The electrical system consists primarily of a stator and water cooled voltage regulator. They can be replaced with conventional alternator type systems for about $350. The closed cooling system tends to be less than optimal, requiring that the water pump impeller in the out drive be maintained properly. A worn impeller will not provide sufficient flow for proper cooling. I replace mine every other year (or about every 175 hours). Also, on the 3.7 liter, the engine water pump runs directly off the cam shaft. When the seals (2) wear, coolant will leak from a small hole located on the bottom of the pump housing. An initial leak indicates one or both have begun to wear and the repair should be made. Depending on the configuration of your boat, engine removel may be required to replace the pump.<br /><br />Keep the engines. Unless the boat is in absolutely perfect condition, it wouldn't be worth engine replacement.
