Exhaust Manifold Overheating, Detroit D. 4-71N

[FF]

"Bringing the boat down from LI to Miami, WOT, the temp would slowly rise and exceed the max recommended temp.
Cure; reduce the RPMs until the temp was back in the normal operating range then back to WOT. We carried out this routine as necessary, maybe once or twice every couple of hours. (John Deere engine, factory installed)"


Do the later boats of this size use the same size keel cooler?

Sounds like an engineering BO BO.

 

[OldDan1943]

"Bringing the boat down from LI to Miami, WOT, the temp would slowly rise and exceed the max recommended temp.
Cure; reduce the RPMs until the temp was back in the normal operating range then back to WOT. We carried out this routine as necessary, maybe once or twice every couple of hours. (John Deere engine, factory installed)"


Do the later boats of this size use the same size keel cooler?

Sounds like an engineering BO BO.

I have no idea about the newer Nordhavns. When mine fell off the jacks in the yard, I went to an AT34 Other than I wish I had 5 more feet at the water line, I am happy. A well designed boat and would recommend it highly.

 

[siestakey]

Dan I enjoy your thought process

 

[OldDan1943]

Dan I enjoy your thought process

2 glasses of wine helped my headache.
and made me sleep better.