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Old 05-10-2014
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Yanmar Engine blower failed

Hi
My 2009 Beneteau 40 has Yanmar 4JH4AE 54 HP engine. A blower blows air into engine compartment. Blower has broken but VERY difficult to get at and replace.
No temp gauge, to see if overheating but all sounds great.
What is blower there for? Can I leave it be?
Thanks, JohnB40
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Old 05-10-2014
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Re: Yanmar Engine blower failed

I had my 2008 B40 4 years and didn't realize the fan wasn't working. Replaced the fuse (located in the aft berth battery area) and now I have the noisy fan. I'm not sure the fan has anything to do with cooling. I was under the impression it was to clear fumes. Maybe others know for sure.

I agree it would be nice to have a real temp and oil pressure gauges. They are on my list. .
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Yanmar Engine blower failed

I don't think the fan is required by Yanmar on any of their consumer engines. I have that Yanmar on a Catalina 42 with no fan . However I do have temp and oil pressure both of which I consider mandatory on any engine and thankfully they are
not terribly expensive or difficult to install.

Those are great engines just take proper care and change the oil as prescribed
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A blower is not necessary for a diesel engine.
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Old 05-11-2014
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Re: Yanmar Engine blower failed

My blower fuse was with the starting key, instruments bundle. So check there.

Mine never worked for the first two years... And when I got it working I blew many fewer solenoids... So maybe a cooler engine compartment is better.
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Yanmar Engine blower failed

I think the blowers on the Beneteaus are primarily to cool the engine compartment. But they are noisy.
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Re: Yanmar Engine blower failed

I have a Beneteau 361 and had wondered the same thing so I asked about the purpose at a Diesel engine course a few weeks ago. For what it's worth, I was told the blower is to improve the air quality in the engine compartment. I guess it makes some sense since that is the air the engine uses.
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Re: Yanmar Engine blower failed

Thanks to all
I will replace ... quite a job.
Concensus seems that the engine will get less air (weight) if that air is hot in engine compartment. Also other equipment in engine compartment, even the alternator, is not helped by having hotter air in engine compartment.
JohnB40
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Re: Yanmar Engine blower failed

Quote:
Originally Posted by JohnB40 View Post
Thanks to all
I will replace ... quite a job.

JohnB40
Check if its stuffed first.

Mine was just a dirty connection in the fuse holder.

Get in the aft lazarette and disconnect the blower and check theres power to it... If not the that will be the problem.
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Re: Yanmar Engine blower failed

I think I am going to call BS on this. Without a blower, how is the "air quality" any different? Is there just not enough air getting into the engine compartment? Is it starving for air?

Do you really think an engine compartment blower will affect the temperature of a water cooled engine? It purposefully sets its own temperature. If you try to cool it more, its thermostat will cool it.

Our 47.7 has no blower. The only other boat I have ever heard of having a blower motor on a diesel was a sea ray 460 but I suspect that has more to do with venting the engine compartment when one might be working down there.

Quote:
Originally Posted by Seand50 View Post
I have a Beneteau 361 and had wondered the same thing so I asked about the purpose at a Diesel engine course a few weeks ago. For what it's worth, I was told the blower is to improve the air quality in the engine compartment. I guess it makes some sense since that is the air the engine uses.
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