Don My guess ( just because noone mentioned it yet) would be a clogged heat exchanger. It was a problem for me on my 35 MK 1, but that was an A4. Not too sure it would apply to your diesel.
Tom Buscaglia Alera C&C 37/40 Vashon WA > > > From: Don Jonsson > Sent: Thursday, May 23, 2013 9:00 PM > To: cnc-list@cnc-list.com > Subject: Stus-List Overheating 3GMD - the plot thickens > > Hi > > > > I had previously sent out a message about an overheating diesel. The > culprit, so I thought, was the knuckle going into the mixing elbow, because > generally when I cleaned it, it worked again. For a while. > > > > So I finally took of the mixing elbow and gave everything a proper cleaning. > I checked the water pump. I checked all hoses by blowing through them and > the engine. > > > > I put it all back together and it all worked and water pumped like it is > supposed to, except the water pump leaked a bit ? needed a new gasket, but I > knew that and just wanted to see if it would work. Got a new gasket and put > it on. Started up and no water. > > > > I took out the thermostat and checked to see it worked ? slightly corroded > but it worked, i.e. opened in hot water. Put everything back together and > started it up and a bit of water but too much steam. Took the thermostat out > and put it in more carefully. Tried again, water running, no steam > everything is perfect. Ran it for a while just to be sure. > > > > Turned it off. Waited a while (an hour) and started it up again. No water. > > > > So the problem is not the mixing elbow (and likely never was as it wasn?t > that bad). Not the pump as it looks fine. Not the thermostat ? I don?t > think although I will replace it. > > > > The problem is sometimes the engine pumps water and sometimes not. And I?m > stumped. > > > > This is a raw water cooled engine which makes things different. Has anyone > had a similar problem and ideas for a solution. > > > > Also, it seems hard to get part numbers for a 3GMD and the local mechanic had > to go find an old book. Is there any place online to find part numbers for > that engine? > > > > Thanks _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
