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  Conquest 305-run genny while on plane?

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Author Topic:   Conquest 305-run genny while on plane?
SouthFla posted 05-10-2012 07:53 AM ET (US)   Profile for SouthFla   Send Email to SouthFla  
Hey folks :-)

Anyone have any experience with the Conquest 305 and the Kohler 4eoz diesel setup? My two questions/concerns relating to real-world use and not just what the manuals say:

1) do you run into any problems leaving the seacock open while underway with the genny NOT running?

2) can you run the genny while on a plane?

Thanks for any input!


jollyrog305 posted 05-10-2012 09:32 PM ET (US)     Profile for jollyrog305    
I personally never have the sea cock open if the genset is not running (not to say it is not ok to do – I just dont), but I have run almost WOT/plane with generator running without any issues.
Sunseekr3 posted 05-12-2012 05:06 PM ET (US)     Profile for Sunseekr3  Send Email to Sunseekr3     
I have a 305 as well. I do run the generator while on plane but, learned from experience, do not try to start it while in rough water. When in rough water the water can enter the cylinder and cause big problems. This happened to me in Lake Erie while drifting in about 5 footers fishing for Walleye.
I was lucky, I managed to do several oil changes and had a specialist look it over and say it was ok, and that I lucked out. The other thing that the specialist said was if the generator does not start on the first try to shut off the water thru hull or you could get water in the cylinder as well.
As the other poster, it might be a good idea to keep the thru hull closed when the generator is not in use.
boatdryver posted 05-12-2012 07:47 PM ET (US)     Profile for boatdryver  Send Email to boatdryver     
Its good to take the cautious approach on this. On some boats the design prevents installing an ideal anti siphon loop in the genset or even main engine exhaust system.

On our Hatteras 58 the galley floor limited the height of the exhaust loop on the 20 KW Northern Lights genset. I commented on this to a mechanic but he thought that since the boat was so old, surely it was "OK".

A year later that genset would not start. Luckily we also had a 12 KW that was operative.

The diagnosis was salt water in the cylinders of the 20 KW Northern Lights which had entered via the exhaust system.

The cost of the on board rebuild of the 4 cylinder genset diesel engine and redesign of the antisiphon loop was $14,000.


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