Crazy Woman Boat Driver
Join Date: Apr 2004
Location: Heading south down the US east coast to the Bahamas
Thanked 17 Times in 14 Posts
Rep Power: 13
Re: Yanmar still overheating
I had the same problem on my engine. First, check to see if your water manifold was recalled. See previous post on this one. Mine was and Yanmar changed it out free. The grey smoke can be caused by a plugged up exhaust elbow. The 3YM30 engines Yanmar recommends every 250 hours to clean it out or replace it.
Take off the hose and shine a light up the elbow to see if it is plugged. If so take off the 4 bolts that hold the whole unit on. You will not be able to unscrew the elbow from the adapter while on the boat. Go the easy route. Either get it cleaned or replace it.
Catalina 445, Hull #90