Koehler Generator shuts down once underway question.

Boatguy49036

Active Member
Nov 4, 2017
128
Grand Haven, MI
Boat Info
440 Sundancer 2006
Cummins QSC 500's
Engines
QSC 500 Cummins
we have a 2004 390 DA with a Koehler generator that dockside or while idling out of the Marina will run under load with no issue. Once we get out and get underway, if there’s any kind of wave action, which is always, it stalls. It will restart but get up on plane again and start rolling a little and stalls again. Had a service call made just to double check that all the coolant and oil levels ok and that impeller was good (it was replaced last fall). The tech didn’t get underway but he did run it 45 min under load with out issue at our dock. Is it designed not to run while underway? Only 2nd year for us with a boat with Gen Set. TIA
 
If the generator doesn't have good fresh water flow it will shutdown by a sensor just after impeller.

Check intake strainer basket for debris
Bad impeller
You could have old impeller vane bits downstream of pump stuck in heat exchanger blocking flow
Bad sensor

That's all I got
 
If the generator doesn't have good fresh water flow it will shutdown by a sensor just after impeller.

Check intake strainer basket for debris
Bad impeller
You could have old impeller vane bits downstream of pump stuck in heat exchanger blocking flow
Bad sensor

That's all I got
Thank you!
 
we have a 2004 390 DA with a Koehler generator that dockside or while idling out of the Marina will run under load with no issue. Once we get out and get underway, if there’s any kind of wave action, which is always, it stalls. It will restart but get up on plane again and start rolling a little and stalls again. Had a service call made just to double check that all the coolant and oil levels ok and that impeller was good (it was replaced last fall). The tech didn’t get underway but he did run it 45 min under load with out issue at our dock. Is it designed not to run while underway? Only 2nd year for us with a boat with Gen Set. TIA
Does that Gen Set have a carb. or fuel injection ? If it's a Carb. it could or might be the float in the carb. hangs up while up on plane. Also when was the fuel filter for Gen. last changed?
That's all i got !
 
Are you getting a code on the genset? Is it starting without requiring a reset?
 
Does that Gen Set have a carb. or fuel injection ? If it's a Carb. it could or might be the float in the carb. hangs up while up on plane. Also when was the fuel filter for Gen. last changed?
That's all i got !
It’s a carb. Thanks for tip.
 
I suspect that when you are on plane there is insufficient raw water available to cool the gen set. Some people can run on plane and some can’t do to hull dynamics, raw water intake placement, etc. I have a 290 and have never tried to run the gen set on plane because I just don’t need it.
 
I suspect that when you are on plane there is insufficient raw water available to cool the gen set. Some people can run on plane and some can’t do to hull dynamics, raw water intake placement, etc. I have a 290 and have never tried to run the gen set on plane because I just don’t need it.
Thanks
 

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