Join Date: Jan 2003
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Rep Power: 12
Yanmar still overheating
Hello looking for your advices AGAIN on my yanmar
That is my 3rd I had never any problem with both my 3GM series but this 3YM 30 is absolutely not reliable on long cruises!
Not even mentioning today the poor electric wires and harness o
From Yanmar I solved this problem with a direct push start button connect directly on solenoid !
At first I had very little water at exhaust and overheating after 5 minutes run even at low RPM A good engine rince with phosphatic acid took care of this and now I have very good water flow
Yesterday coming back from Cape Cod to Boston with no wind and perfectly flat sea. 60 miles under power.
Highest possible RPM is 3600 so fine according to the Yanmar specs , and then I should cruise at 3200
Here is my problem If cruising at 2600 absolutely no temp problem
At 2800 I get some grayish smoke but no overheat and all is well
At 3000 I get lots of grayish smoke, perfect water flow, BUT then afetr 10 minutes, engine overheat and alarm comes on.
When I shut engine down, engine cools in 20 minutes and if I restart and cruise at 2600 all is fine for hours.
Could it be the coolant? Level is fine but I that is the original coolant with now 250 hours in 4 years. Does a coolant degrades by itself?.
And what is your recommendation of best coolant for the Yanmar 3ym30 ?
Lots of questions but I know that many owners of Yanamar had to deal with this problem so your advices will save me time in researches.