Pluggage at the small elbow where the cooling water enters the mix elbow is common in older Yanmars. Remove the small elbow. Clean it and its entry point to the mix elbow.
More an irritation than a concern. My feeling is it's due to excessive idling and low rpm running. Push the engine a bit harder. Rev it up in gear at the dock before shutting down. Dennis C. Sent from my iPhone On May 13, 2013, at 12:52 PM, "Don Jonsson" <dbjons...@shaw.ca> wrote: > Once, many years ago. I checked it when it overheated two years ago and it > was fine - i.e. the bit didn't come off of it. I didn't check it this time, > as when I cleared the knuckle the water was pumping fine and I was running > late in catching the ebb home. > > -----Original Message----- > From: David Risch [mailto:davidrisc...@msn.com] > Sent: May-13-13 10:47 AM > To: Don Jonsson ; cnc-list@cnc-list.com > Subject: Re: Stus-List Overheating due to plugged knuckle > > Don, > > Ever blow an impeller in years past? > David F. Risch > (401) 419-4650 cell > > -----Original Message----- > From: Don Jonsson <dbjons...@shaw.ca> > Date: Mon, 13 May 2013 17:44:51 > To: <cnc-list@cnc-list.com> > Subject: Stus-List Overheating due to plugged knuckle > > > > Hello all > > I have an elderly Yanmar 3GMD engine that is raw water cooled. It has > plugged twice in the last two years where the water goes through a knuckle > into the mixing elbow. The first time (summer before last) was some solid > bit that had gotten stuck - how it got there I don't know. The last time > (last week) was due to a tar like substance gumming up the knuckle. Easy to > clear and I was on my way, but is this a harbinger of something more > serious. > > I took the mixing elbow off a few years back and cleaned it, guess it is > time to do that again. > > Is the plugging coming from the exhaust and working its way into the knuckle > - for example unburned diesel? > > Thanks for any insight. > > Don > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
