Dave, The mixing elbow is a common culprit. Removing and cleaning it is always a good idea. While you have the injection hose off, run the engine to check for water flow (point it into a quart jar or something like a milk jug). You should see a regular stream of water. If the water flow is insufficient, the problem is further upstream in the heat exchanger, hoses, or the water pump. I'm assuming you cleaned out the strainer.
Lastly, make sure the thru-hull is clear also. The intake for the engine cooling is rather small. I pull the hose of the intake side of the raw water pump. It should flow freely. Jake Jake Brodersen C&C 35 Mk-III "Midnight Mistress" Hampton VA -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Syerdave--- via CnC-List Sent: Saturday, September 3, 2016 20:37 To: C&c Stus List <cnc-list@cnc-list.com> Cc: syerd...@gmail.com Subject: Stus-List Loud Yanmar 2gm - like open exhaust? This just started happening this weekend. When first started and idling the exhaust is noisy - like an open exhaust, maybe no water. Run it for a bit at higher rpm, and suddenly it quiets down and sounds normal. Next cold start, same thing. Did a quick check of the raw water strainer underway, and there was some stuff in there, but water was being sucked through. Is the mixing elbow clogging? Haven't had that off yet... Thanks all! Dave. _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you like what we do, please help us pay for our costs by donating. All Contributions are greatly appreciated!
