First thank you very much to all of you who took time to reply.
Please let me clarify some things. I did not modify anything ..yet.
This particular engine cooling system is set up like that (with water recirculation) from the beginning. I remember reading some post when the gentlemen who owns M15 always laugh when he starts the engine and there is no water coming out of the boat and good intentional passer by are yelling at him "no water, no water, cut the engine" and he just stoically replies; "it is OK it is supposed to be like that". Well, he is right, idea is to warm up the engine as soon as possible (as we all know cold engine is as bad as too hot). I did not like the idea that the engine does not spit water immediately as much as you dont like it. But it is how it is supposed to be working.
What bothers me is that now I need to clamp the recirculation line, it should be the task for the thermostat.
As a side note good folks made a lot of mod to this engine (which by the way is kept in high respect by owners). Ball Valve being one of them. Next one is connecting sink line to the very same T and running engine on either fresh water or coolant
alone before shooting it off, purging the cooling system from salt water
. Others yet add fresh water cooling system because as they said they hate the idea of salt water
eating innards of their beloved 5411. Also if the engine is fresh water cooled it can be run on higher temperature whereas raw water cooled has to run at lower temperature to avoid excessive scaling.
1. Return line hose looks like it is the wrong size (unless the camera
lies) the line is low pressure and very small.
--You are very right, there were replaced by professional diesel mechanic
(what I mean is that I paid him) He stated that the old one were old and new one should be better. It was leaking before the change and it is leaking after the change
2. What temperature do you get at overheating?
158 F measured at cylinder head
. When I get this high I clamp mixing tee and this very quickly (1 minute max) cool the engine to 140 F. Operational temp according to manual should be 135 to 150
3. Do you have water coming out the exhaust when the thermostat opens?
Yes, more then before and more if I put the engine to work (that is put it in gear)
4. Is there a water heater plumbed into the engine?
I will try to find the obstruction on fuel return lines as suggested by Daddle tomorrow.
Again, thank you very much Guys for your thoughts and suggestions. Good night!