Engine room heat
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Your posting caught my attention. I write this to be helpful. I am not trying to be a smartass. I am only trying to help.
I believe that the ambient temperature of the engine room (ER) will not reach much higher than about 60C. If I am not mistaken it takes the breaker reaching 75C or higher to possibly cause the breaker to open, but I am not sure what temperature the French-made Dirupter's open.
The operating temperature of the main engine and Onan should be not much higher than about 80C, regardless of how long they have been running. The exhaust elbow reduces exhaust temperature to about 50C. The ER input and output blowers move enough air to change 100% of the ER air in a few minutes. Are both working?
Of course, the above temperatures assume that the raw water heat exchange system is working. Sufficient raw water flow is the #1 reason you will have heat issues and you cannot tell by looking at the exhaust to determine if it is sufficient. Measure the temperature of the oil filter with a laser temperature gun after the engine has operated long enough to reach operating temperature.
The two blowers (input & output) are also very important.
Some hidden water flow issues can possibly be:
Clogged sea chest including the connection through the sea chest to the sea
Clogged hoses in the raw water pathway, in & out.
Clogged heat exchanger.
Clogged elbow and on Onan also the exhaust manifold.
Clogged oil cooler for ZF 25 transmission.
Raw water pump defect or worn impeller. A raw water impeller will lose substantial power when blade tips become worn.
If I were you I would check further to see if the cause of the high ER heat was possibly caused by something not operating as designed.
Again, I hope this helps you and/or any other owner.
On Sat, Apr 9, 2022, 09:03 Ralph Heilig <ralph.heilig@...> wrote: