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post #21 of 25 Old 06-28-2019
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Re: Engine Ventilation Fan always on

David every late model Catalina, Beneteau or Jeanneau I've been on is wired so the fan comes on with ignition switch in "ON" position. The Catalina's have a switch under the instrument pod which will turn it off, probably because they are mounted on the transom and make as much noise as the engine. On a French built Jeanneau the fan is mounted above the engine in the well insulated compartment and you don't get ANY engine or fan noise at the helm. I can't remember where the fan is mounted on French boats built here in the states.

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post #22 of 25 Old 06-28-2019
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Re: Engine Ventilation Fan always on

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Originally Posted by roverhi View Post
Have owned three diesel powered boats without an engine fan. Have run those engines continuously for as long as 72 hours including one 24 hour run in the doldrums when it was blazing hot. Never had a problem but then didn't have any exhaust leaks to stink up the boat. No reason not to run an exhaust fan for the engine compartment but it's not necessary with normal air leakage in and out of the compartment. Maybe if you sealed it up tight with virtually no air leaks you'd need an exhaust fan. If you have a fan, no harm in using it but wouldn't waste money and effort installing one or replacing one that died.
My boat came with a factory installed exhaust fan which was ON when the key switch is on... engine running or not. I believe I reversed the direction a number of years ago to remove any smoke or orders from the boat... rather then have the fan push them into the boat. Fan is noisy when engine in not running but unheard when it is running. I see no downside to this arrangement. And no... there is no alarm on the key switch.

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post #23 of 25 Old 06-28-2019 Thread Starter
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Re: Engine Ventilation Fan always on

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Originally Posted by svHyLyte View Post
To date I have not found any of these fans to be particularly "nosy" save in cases where the bearings in the fans are failing

FWIW...
Thanks, That is another possibility.

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post #24 of 25 Old 06-28-2019
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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.

Jeff


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post #25 of 25 Old 06-28-2019
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Re: Engine Ventilation Fan always on

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Originally Posted by Jeff_H View Post
It sounds like the blower needs to be replaced since you should not hear it over the engine
This is definitely true, and the first signal to me that I need to replace a blower. Just replaced two today ironically, and the sound difference is night and day. Can't hear the new one at all unless I actually open the engine compartment.

Mark
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