Join Date: Feb 2000
Location: Annapolis, Md
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Re: Engine Ventilation Fan always on
One more key point, electrical systems on gas engines use 'explosion proof' electrical components. Diesel engines generally do not use 'explosion proof' electrical components. On boats with propane systems, engine room ventilation was required if the engine did not have 'explosion proof' electrical components. It should be run for five minutes before starting the engine and while the engine is running, and it probably makes sense to run it after the engine is shut down to cool the engine room. The blower should therefore be on a separate switch than the ignition switch. It sounds like the blower needs to be replaced since you should not hear it over the engine and it should be on a switch so you can shut it on or off when you want to.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay